Brass vs. ZAMAK Guitar Bridges: Material, Manufacturing and Tonal Direction

Brass and ZAMAK are fundamentally different material and manufacturing directions for Tune-O-Matic-style bridge bodies. They differ in density, mechanical properties, production history, component mass and the geometry each process makes practical.

KMS uses both deliberately: ONE uses CNC-machined C36000 H02 brass, while Vintage ONE uses a vacuum die-cast ZAMAK blank whose functionally decisive geometry is then CNC-machined. They are not two quality levels of the same bridge.

KMS Material Directions

The Central KMS Distinction

KISS MY STRINGS uses the two materials deliberately.

ONE

The KMS ONE bridge uses CNC-machined C36000 H02 brass.

Its intended response is:

• More body
• Greater perceived note weight
• Strong fundamental presence
• Long sustain
• Low-end authority
• Greater low-mid substance
• A substantial playing response

Vintage ONE

The KMS Vintage ONE uses a controlled ZAMAK bridge-body blank produced through vacuum die casting and then CNC-machined.

Its intended response is:

• Open response
• Lively dynamics
• Strong definition
• Reduced low-mid density
• Immediate playing feedback
• Vintage-style character

Neither material is presented as universally superior.

The correct bridge depends on:

• The guitar’s existing character
• The player’s tonal goal
• The required mounting system
• The preferred response

C36000 Brass

What Is Brass?

Brass is a family of copper-zinc alloys.

Different brass grades may contain additional elements to influence:

• Machinability
• Strength
• Ductility
• Wear behavior
• Corrosion resistance
• Formability

The term brass alone does not identify one exact engineering material.

Examples of brass families include:

• Cartridge brass
• Naval brass
• Free-cutting brass
• High-strength brass
• Lead-free machining brass
• Casting brass

The exact alloy and material condition matter.

What Is C36000 Brass?

KMS uses C36000 H02 for the ONE bridge.

C36000 is commonly known as:

• Free-Cutting Brass
• Free-Machining Brass
• UNS C36000

Its nominal composition includes approximately:

• 60 to 63 percent copper
• 2.5 to 3 percent lead
• Zinc as the principal remaining element
• A controlled maximum iron content

The lead is distributed within the alloy to improve machining behavior.

It helps the material form short, controllable chips and reduces cutting resistance during precision machining.

C36000 is widely used for:

• Turned parts
• Threaded components
• Fittings
• Hardware
• Valve parts
• Fasteners
• Precision screw-machine components

What Does H02 Mean?

H02 describes the material temper.

For wrought copper alloys, H02 commonly indicates a half-hard condition produced through controlled cold work.

Temper influences:

• Tensile strength
• Yield strength
• Elongation
• Hardness
• Residual stress
• Machining behavior

The exact mechanical values also depend on:

• Product form
• Bar or rod dimensions
• Manufacturing standard
• Section size
• Supplier condition

C36000 H02 is therefore more precise than simply stating solid brass.

It identifies both:

• The alloy
• The material condition

Representative C36000 Properties

Published representative properties for C36000 include:

• Density: approximately 8.5 g/cm³
• Elastic modulus: approximately 96.5 GPa
• Machinability rating: 100 on the conventional free-cutting-brass reference scale

Mechanical-strength values vary according to:

• Rod diameter
• Bar form
• Section size
• Applicable standard

For this reason, one tensile or yield-strength figure should not be presented as universal for every C36000 H02 bridge blank.

Why KMS Uses C36000 H02

C36000 H02 supports the production of:

• Accurate bridge-body geometry
• Clean post holes
• Precise saddle channels
• Defined locking features
• Controlled threads
• Repeatable intonation travel
• Consistent surface finishing

The material also provides substantial component mass.

This supports the intended ONE response:

• Body
• Weight
• Authority
• Sustain
• Low-frequency substance

The material and the bridge design were selected together.

ZAMAK

What Is ZAMAK?

ZAMAK is a family of zinc-based die-casting alloys.

The name is formed from the German names of the principal alloying elements:

• Zink
• Aluminium
• Magnesium
• Kupfer

Zinc is the principal base metal.

The controlled additions of aluminum, magnesium and copper influence:

• Strength
• Hardness
• Ductility
• Casting behavior
• Dimensional stability
• Creep resistance
• Surface finish
• Plating suitability

ZAMAK is therefore not one exact alloy.

Common ZAMAK Grades

Common standardized grades include:

• ZAMAK 2
• ZAMAK 3
• ZAMAK 5
• ZAMAK 7

ZAMAK 3

ZAMAK 3 is a widely used general-purpose zinc die-casting alloy.

It provides a balanced combination of:

• Castability
• Strength
• Ductility
• Dimensional stability
• Surface-finishing capability

ZAMAK 5

ZAMAK 5 contains approximately one percent copper.

Compared with ZAMAK 3, it generally provides:

• Greater tensile strength
• Greater yield strength
• Greater hardness
• Improved creep performance
• Lower ductility

ZAMAK 2

ZAMAK 2 contains approximately three percent copper.

Within the conventional ZAMAK family, it provides particularly high:

• Strength
• Hardness
• Creep resistance

Its higher copper content can also produce greater long-term dimensional change through aging.

ZAMAK 7

ZAMAK 7 is related to ZAMAK 3 but uses a lower magnesium range and controlled impurities.

Its characteristics include:

• Improved fluidity
• Greater ductility
• Suitability for thin sections
• High-quality surface finish

These grades must not be treated as interchangeable without confirming the component specification.

ZAMAK 3 as a Technical Reference

ZAMAK 3 is often used as a general reference when comparing zinc die-casting alloys.

Representative die-cast properties include:

• Density: approximately 6.6 g/cm³
• Elastic modulus: approximately 85.5 GPa
• Typical tensile strength: approximately 283 MPa
• Typical yield strength: approximately 221 MPa
• Typical hardness: approximately 82 HB

These are typical properties measured on defined die-cast test specimens.

They are useful for material comparison.

They are not automatic design values for every guitar bridge.

The Exact Vintage ONE Alloy

The word ZAMAK identifies the material family but not the complete product specification.

The performance of the Vintage ONE bridge body also depends on:

• Exact alloy
• Melt quality
• Impurity control
• Casting temperature
• Die temperature
• Filling process
• Vacuum control
• Solidification
• Tooling
• CNC machining
• Final inspection

The exact product should therefore not be described merely as pot metal or generic zinc.

It is a controlled engineering component.

Mechanical Comparison

Brass vs. ZAMAK Density

C36000 brass has a representative density of approximately:

• 8.5 g/cm³

ZAMAK 3 has a representative density of approximately:

• 6.6 g/cm³

At identical volume, a C36000 component would therefore be approximately 29 percent heavier than a ZAMAK 3 component.

This does not mean that every brass bridge is 29 percent heavier than every ZAMAK bridge.

Actual bridge mass also depends on:

• Width
• Height
• Wall thickness
• Internal cavities
• Saddle channels
• Locking features
• Material removal
• Screw and saddle materials

Compare finished component weights rather than density alone.

Density Is Not Stiffness

C36000 has a representative elastic modulus of approximately:

• 96.5 GPa

ZAMAK 3 has a representative modulus of approximately:

• 85.5 GPa

The brass reference is therefore elastically stiffer at equal geometry, but the difference in modulus is much smaller than the difference in density.

This distinction matters.

Brass is not simply:

• Heavier
• Stronger
• Stiffer

by one identical factor.

Each property must be evaluated separately.

Component Stiffness Depends on Geometry

The resistance of a bridge body to bending depends on:

• Material modulus
• Cross-sectional height
• Wall thickness
• Width
• Unsupported span
• Saddle-channel geometry
• Post position
• Load direction

A relatively small increase in the vertical section height can have a major effect on bending stiffness.

A well-designed ZAMAK bridge may therefore resist deformation more effectively than a poorly proportioned brass bridge.

Material does not replace structural design.

ZAMAK Is Not Generic Pot Metal

Pot metal is an informal and imprecise term.

Historically, it has been used for a wide range of low-melting non-ferrous alloys whose exact composition may be:

• Unknown
• Inconsistent
• Uncontrolled
• Based on available scrap
• Unsuitable for demanding components

A standardized ZAMAK alloy is different.

It has:

• Defined composition limits
• Controlled impurity levels
• Published mechanical properties
• Established casting procedures
• Recognized standards
• Known finishing behavior

Calling every zinc-alloy guitar bridge pot metal removes the distinction between:

• Controlled engineering alloy
• Unidentified low-grade casting material

ZAMAK can be used in inexpensive products.

That does not make the alloy itself technically undefined or inherently poor.

Material Quality vs. Product Quality

A defined alloy is only the starting point.

The finished component still depends on:

• Alloy purity
• Melt handling
• Tooling
• Filling
• Venting
• Temperature control
• Solidification
• Porosity
• Machining
• Plating
• Inspection

A poorly controlled component can be produced from a recognized alloy.

A highly controlled component can be produced from ZAMAK.

The material name alone cannot reveal the manufacturing quality.

Manufacturing Comparison

What Is Die Casting?

In high-pressure die casting, molten metal is injected into a reusable steel die.

The process can produce:

• Complex geometry
• Thin sections
• Integrated features
• Repeatable dimensions
• Smooth surfaces
• High production volumes
• Near-net-shape components

Zinc alloys are especially suitable for hot-chamber die casting because of their relatively low melting temperature and casting behavior.

Die Casting Is Not One Quality Level

Die-cast components can differ substantially.

Important process variables include:

• Alloy temperature
• Die temperature
• Injection speed
• Injection pressure
• Gate design
• Venting
• Vacuum
• Solidification rate
• Ejection
• Recycled-material control
• Tool wear

The statement die cast does not reveal whether the component was produced with:

• Minimal process control
• Conventional production control
• Vacuum assistance
• High-vacuum technology
• Additional inspection
• Secondary CNC machining

Porosity

Porosity can form when:

• Gas becomes trapped during filling
• Metal flow is turbulent
• Solidification shrinkage is not adequately fed
• Venting is insufficient
• Process temperatures are unsuitable

Porosity may affect:

• Local strength
• Surface finishing
• Machining
• Thread integrity
• Plating
• Dimensional reliability

Not every small pore makes a component unusable.

The relevance depends on:

• Size
• Location
• Distribution
• Component load
• Machined surfaces
• Required finish

Vacuum-Assisted Die Casting

A vacuum system can remove air from the die cavity before or during metal injection.

This can reduce the amount of gas trapped inside the casting.

High-integrity high-vacuum processes are used when minimized gas porosity and increased mechanical performance are required.

However:

• Vacuum does not guarantee zero porosity.
• The term vacuum does not define the complete process.
• Tooling and process control remain critical.
• Vacuum-assist and high-vacuum casting are not automatically identical.

The exact production method must be assessed as a complete process.

The Vintage ONE Manufacturing Concept

The KMS Vintage ONE bridge-body blank is produced through vacuum die casting.

This manufacturing step is intentional.

It preserves the material and construction principles associated with traditional zinc-alloy Tune-O-Matic bridge bodies.

The casting is then CNC-machined.

This creates a hybrid manufacturing concept:

• Casting establishes the material body and fundamental construction.
• CNC machining establishes the final precision.

Why Not Machine Vintage ONE Entirely from ZAMAK Bar?

Machining a complete bridge body from solid ZAMAK stock would create a different manufacturing history and material structure.

Even when the nominal alloy were similar, the component could differ through:

• Solidification history
• Grain and phase structure
• Residual stress
• Internal material distribution
• Available geometry
• Material removal
• Final mass

For Vintage ONE, the casting process is part of the intended product identity.

The goal is not merely to imitate the outside shape of a cast bridge.

Why CNC-Machine the Casting?

Critical bridge features require controlled final geometry.

These can include:

• Post locations
• Saddle tracks
• Saddle contact areas
• Intonation-screw alignment
• String spacing
• Radius-related saddle positions
• Outer dimensions
• Locking features where applicable
• Finish preparation

CNC machining can create these features more accurately than relying only on the as-cast surface.

CNC Machining Does Not Erase the Casting

Machining a cast blank does not convert it into a wrought or billet component.

The body retains:

• Its cast material history
• Its solidification structure
• Its fundamental cast volume
• Its characteristic material distribution

CNC machining refines selected surfaces and dimensions.

This distinction is central to Vintage ONE:

Vintage material and casting process. Modern machining precision.

Machining Cannot Correct Every Casting Defect

Secondary machining can remove surface material and define geometry.

It cannot automatically eliminate:

• Deep internal porosity
• Inclusions
• Inadequate alloy composition
• Incorrect solidification
• Structural cracks
• Poorly distributed defects

Casting quality must be established before machining.

CNC is not a repair process for an uncontrolled blank.

CNC-Machined Brass

The ONE bridge body begins from a wrought C36000 H02 brass blank.

The bridge geometry is created through material removal.

Advantages include:

• Direct control of each machined surface
• Defined post geometry
• Accurate saddle channels
• Repeatable locking features
• Controlled wall thickness
• Clean thread production
• Consistent component geometry

The process is fundamentally different from casting a near-net-shape zinc-alloy body.

Wrought Material

A wrought brass blank has been mechanically processed into forms such as:

• Rod
• Bar
• Plate
• Profile

This processing produces a different material history from a casting.

Wrought and cast materials can differ in:

• Grain orientation
• Porosity
• Residual stress
• Mechanical anisotropy
• Surface condition
• Available temper

The distinction is part of the complete bridge construction.

Machining Efficiency

C36000 is specifically developed for efficient machining.

Its machining characteristics support:

• Short chip formation
• Accurate turning
• Precise milling
• Reliable drilling
• Clean threading
• Efficient finishing

This makes it suitable for complex bridge components with:

• Small details
• Repeated adjustment features
• Precise interfaces
• Tight dimensional requirements

Manufacturing Cost

A die-cast component is not automatically cheap.

Its production may require:

• Expensive steel tooling
• Process development
• Vacuum equipment
• Quality control
• Alloy management
• Secondary machining
• Plating
• Inspection

Die casting becomes economically efficient particularly when tooling cost is distributed across sufficient production volume.

Likewise, CNC machining from solid material involves:

• Expensive raw material
• Machine time
• Tooling
• Material removal
• Inspection
• Finishing

Cost and quality cannot be inferred from process name alone.

Historical Construction

Historical Zinc-Alloy Bridge Construction

Zinc die-cast bridge bodies combined with brass saddles and mounting hardware are a recognized Tune-O-Matic construction approach.

Gibson’s current Historic Reissue Non-Wire ABR-1, which is intended to recreate its late-1950s non-wire bridge, is specified with:

• Zinc die-cast bridge body
• Nickel-plated brass saddles
• Nickel-plated brass intonation screws
• Nickel-plated brass thumbwheels
• Nickel-plated brass posts

This provides a clear current manufacturer example of vintage-oriented mixed-material construction.

It should not be interpreted as proof that every historical bridge used one identical zinc alloy, composition or production process.

Historical Accuracy Requires More Than ZAMAK

A vintage-style bridge is influenced by:

• Bridge-body material
• Body dimensions
• Saddle material
• Retainer system
• Intonation screws
• Posts
• Thumbwheels
• Post spacing
• String spacing
• Bridge mass
• Plating
• Manufacturing tolerances

Using a zinc alloy alone does not make a bridge historically accurate.

Likewise, improving dimensional precision does not automatically remove vintage character.

Precision Is Not the Opposite of Vintage

Vintage character does not require:

• Loose saddles
• Poorly aligned screws
• Rattling
• Damaged threads
• Uncontrolled casting defects
• Inconsistent dimensions

The intended historic material behavior can be retained while improving:

• Alignment
• Adjustability
• Repeatability
• Compatibility
• Mechanical reliability

Vintage ONE follows this principle.

Mechanical Behavior

Mechanical Behavior of Brass and ZAMAK Bridges

A bridge must support continuous string load while maintaining:

• String radius
• Saddle position
• Intonation
• Post alignment
• Structural shape
• Stable component contact

The relevant mechanical behavior depends on:

• Material
• Geometry
• Unsupported span
• Downward string force
• Tailpiece position
• Saddle arrangement
• Bridge height
• Long-term loading
• Temperature
• Manufacturing quality

Strength Comparisons Require Caution

Published strength values for C36000 and ZAMAK are not automatically comparable.

C36000 data may refer to:

• Wrought rod
• Bar
• Flat product
• Specific H02 section size

ZAMAK data may refer to:

• Net-shape die-cast test bars
• A defined casting process
• Typical rather than minimum values

The materials also fail and deform through different mechanisms.

A single tensile-strength number does not determine which bridge will remain stable.

Yield Strength

Yield strength describes the stress at which permanent deformation begins.

Greater yield strength can help a bridge resist:

• Permanent bending
• Saddle-channel deformation
• Distortion around post holes
• Thread deformation
• Collapse under sustained load

However, local stress depends heavily on component shape.

A strong material can still deform when:

• The section is too thin.
• A sharp corner creates a stress concentration.
• The unsupported span is too large.
• String downforce is excessive.
• A casting defect lies in a critical area.

Elastic Stiffness

Before permanent deformation begins, the bridge bends elastically under load.

Its bending stiffness depends on:

• Elastic modulus
• Cross-sectional geometry
• Span
• Support
• Direction of load

C36000 has a moderately higher elastic modulus than representative ZAMAK 3.

Geometry can create a much larger difference than the material modulus alone.

Creep

Creep is time-dependent deformation under sustained load.

It is often associated with elevated temperature, but zinc-alloy behavior can also be more time- and temperature-sensitive than many wrought copper alloys.

Creep resistance varies between ZAMAK grades.

For example:

• ZAMAK 5 has better creep performance than ZAMAK 3.
• ZAMAK 2 provides still greater creep resistance but can show more dimensional change through aging.

For a guitar bridge, long-term stability therefore depends on:

• Exact alloy
• Temperature history
• Continuous load
• Cross-section
• Casting quality
• Bridge design

ZAMAK should not be described as universally unstable.

Its time-dependent behavior must be accounted for in the design.

Bridge Collapse

A Tune-O-Matic bridge may gradually develop a downward curve across its center.

This is commonly described as bridge collapse.

Possible contributing factors include:

• High string tension
• Steep break angle
• Thin bridge-body section
• Long unsupported span
• Material yielding
• Long-term creep
• Casting porosity
• Local defects
• Excessive tailpiece pressure
• Prior mechanical damage

No single cause should be assumed without inspection.

Downforce and Break Angle

The strings exert force on the saddles.

The downward component increases as the string path behind the bridge becomes steeper.

Lowering the tailpiece can therefore increase the load pressing the strings into the bridge.

A steep break angle does not automatically improve:

• Sustain
• Energy transfer
• Stability
• Tone

Possible disadvantages include:

• Greater bridge-body load
• String contact with the rear edge of the bridge
• Increased saddle pressure
• More friction
• Reduced compliance
• Accelerated deformation in a marginal bridge

The appropriate break angle is the one that provides secure string contact without creating unnecessary mechanical problems.

String Contact with the Bridge Body

The strings should normally contact the intended saddle surfaces.

When a string touches the back edge of the bridge:

• Another contact point is introduced.
• Friction can increase.
• Tuning behavior can change.
• Downward load can rise.
• The intonation reference may become less clean.

Raise the tailpiece or adjust the installation when required.

Do not use body contact as evidence that the string is coupled more strongly.

Symptoms of a Collapsed Bridge

Possible signs include:

• Middle strings sit lower than intended.
• String radius no longer matches the neck.
• Middle strings buzz before outer strings.
• Action cannot be balanced correctly.
• Saddles appear visually lower in the center.
• A straightedge reveals a concave bridge-body shape.
• Bridge adjustment reaches its limit.
• Wide bends choke despite otherwise reasonable setup.

Confirm whether the problem lies in:

• Bridge body
• Saddle slots
• Saddle order
• Fret condition
• Neck geometry

A wrong string radius does not automatically prove structural collapse.

Can a Brass Bridge Collapse?

Yes.

Brass does not make poor geometry immune to bending.

A brass bridge may still deform because of:

• Insufficient cross-section
• Excessive load
• Poor alloy condition
• Manufacturing defect
• Damage
• Incorrect installation

The higher density and wrought construction of a specific brass bridge do not replace proper engineering.

Can a ZAMAK Bridge Remain Stable?

Yes.

A correctly designed ZAMAK bridge can provide long-term service when it has:

• Suitable alloy
• Adequate cross-section
• Controlled casting quality
• Correct downforce
• Stable mounting
• Appropriate saddle geometry

Material family alone does not predict failure.

Saddles and Bridge Body Perform Different Functions

The saddle is the immediate bridge-side termination of the string.

It controls:

• String position
• Contact geometry
• Intonation point
• Local friction
• Wear
• Part of the attack response

The bridge body controls:

• Saddle support
• Overall mass
• Structural span
• Connection to the posts
• Larger-scale mechanical response
• Adjustment stability

A ZAMAK body with brass saddles is not a fully ZAMAK string-contact system.

A brass body with stainless-steel saddles is not a fully brass response.

Brass Saddles

Brass saddles can support:

• Strong fundamental presence
• Greater perceived note body
• Smooth response
• Defined but substantial attack
• Compatibility with conventional slotting
• Accurate machining

The result depends on:

• Saddle mass
• Slot geometry
• Contact width
• String gauge
• Bridge body
• Surface finish

Stainless-Steel Saddles

Stainless-steel saddles provide another string-contact material option:

• Focused attack
• Wound-string clarity
• Strong articulation
• Stable contact
• Corrosion resistance
• Defined low-string response

They can be used selectively rather than across every string.

Mixed Saddle Configuration

A selected KMS configuration can combine:

• Stainless-steel saddles for wound strings
• Brass saddles for plain strings

The goal is to balance:

• Definition on wound strings
• Body on plain strings
• String-to-string response
• Attack
• Harmonic clarity

This is a more targeted form of voicing than changing the complete bridge body alone.

Conventional Saddle Slots

Filed string slots influence:

• Lateral position
• String height
• String radius
• Contact shape
• Friction
• Break point

Two otherwise identical bridges can behave differently when one has:

• Deep slots
• Wide slots
• Burrs
• Incorrectly angled slots
• Unequal slot depths

Do not attribute a saddle-slot problem to the bridge-body material.

V-Saddle Geometry

KMS V-saddles center the string through their geometry rather than through a conventional individually filed slot.

This can support:

• Broad gauge compatibility
• Defined centering
• Gauge changes without conventional reslotting
• Controlled contact geometry
• Preservation of the intended saddle surface

The saddle system must be evaluated separately from whether the body is brass or ZAMAK.

Posts and Thumbwheels

The bridge body is supported by the mounting hardware.

Posts and thumbwheels influence:

• Height
• Alignment
• Lateral stability
• Contact
• Mechanical play
• Long-term adjustment

Loose or incompatible hardware can create:

• Rocking
• Rattle
• Changing saddle position
• Poor intonation stability
• Reduced clarity

A well-made bridge cannot correct a moving foundation.

Direct Posts vs. Bushings

A traditional ABR-1-style installation may use:

• Small direct posts
• Separate thumbwheels
• No pressed-in bridge bushing

A Nashville-style or import installation may use:

• Posts threaded into bushings
• Larger body holes
• Different upper post geometry

Mounting construction can influence the mechanical result independently from bridge-body material.

Locking vs. Non-Locking Construction

A non-locking bridge rests on its posts or thumbwheels.

A locking bridge mechanically secures the bridge body to the mounting system.

Locking can help:

• Preserve settings during string changes
• Reduce accidental movement
• Stabilize bridge orientation
• Control play

It does not automatically make the bridge tonally superior.

The effect must be separated from:

• Material
• Mass
• Post system
• Geometry
• Fit

Individually Retained Intonation Screws

KMS ONE and Vintage ONE bridges do not use the familiar shared retainer-wire arrangement found on later ABR-1-style Wire Bridges.

On that traditional construction, the intonation screws and saddles are inserted into the open bridge body from above.

A single retainer wire extends across the bridge to prevent the screws and saddles from falling out.

KMS uses a different retention principle.

Each intonation screw is inserted through the bridge body and secured individually by a retaining clip.

Once assembled:

• The intonation screw remains captured inside the bridge.
• The corresponding saddle is retained on the intonation screw.
• Each adjustable string position is secured independently.
• No shared retainer wire is required across the bridge body.

This construction supports:

• Secure retention of each intonation screw
• Secure retention of each saddle
• Controlled servicing of individual components
• Reliable saddle and screw positioning
• Elimination of a shared retainer wire as an additional moving component
• Reduced potential for retainer-wire-related vibration or rattle

The principle is established within modern Tune-O-Matic-style bridge construction and is not unique to KMS.

Different manufacturers may use:

• Retaining clips
• C-clips
• Retaining springs
• Other captured-screw arrangements

The exact component geometry and retention method remain manufacturer-specific.

The KMS system should therefore be described as:

• Individually retained intonation screws
• Clip-retained intonation screws
• Captured intonation screws secured by individual retaining clips

The retention system is a construction feature rather than a property of brass or ZAMAK.

It is used across both KMS material directions:

• CNC-machined brass ONE bridges
• Vacuum die-cast and CNC-machined ZAMAK Vintage ONE bridges

The material determines the broad mechanical and tonal direction.

The retention system determines how the adjustable components are secured within the bridge.

A Clip-Retained System Can Still Require Service

Individual retention does not make the mechanism immune to wear, damage or incorrect assembly.

Inspect the system when:

• An intonation screw develops excessive axial movement.
• A retaining clip is missing.
• A clip is bent or damaged.
• A screw does not remain securely captured.
• A saddle cannot be adjusted smoothly.
• A component has been installed in the wrong orientation.
• A screw or saddle has been replaced with an incompatible part.

Do not substitute an improvised clip or wire without confirming:

• Material
• Dimensions
• Retention force
• Installation direction
• Compatibility with the bridge body

The retaining clip is a functional component.

It must remain correctly seated.

Retainer Wire vs. Individual Clips

The two systems solve the same basic service problem in different ways.

Shared Retainer Wire

A single wire retains several intonation screws and saddles across the bridge.

Possible characteristics include:

• Historically familiar ABR-1 construction
• Simple shared retention
• One component acting across multiple saddles
• Potential for wire movement or rattle when fit is unsuitable

Individual Retaining Clips

Each intonation screw is retained separately.

Possible characteristics include:

• Independent component retention
• No shared wire across the bridge
• Controlled removal of individual screws
• Reduced interaction between the retention mechanisms of adjacent saddles
• No common retainer wire as a potential vibration source

Neither principle should be judged only by appearance.

Its success depends on:

• Geometry
• Material
• Retention force
• Assembly
• Manufacturing accuracy
• Condition

Rattle Is Not a ZAMAK Property

Rattle can arise from:

• Loose saddles
• Shared retainer-wire movement
• Damaged or incorrectly seated retaining clips
• Intonation-screw play
• Poor post fit
• Worn threads
• Loose locking parts
• Insufficient string pressure
• Damaged components

Replacing ZAMAK with brass may remove the rattle only when the replacement also changes the defective geometry, retention system or mechanical fit.

Likewise, replacing a Wire Bridge with an individually retained design can remove one potential source of rattle without proving that bridge-body material caused the original problem.

The diagnosis must identify the moving interface.

Material sets the mechanical baseline.

Construction controls the component relationships.

Tonal Direction

Tonal Direction vs. Universal Sound Claim

Material properties create real mechanical differences.

They do not create one guaranteed frequency curve for every guitar.

The tonal descriptions in this article refer to complete KMS bridge directions combining:

• Material
• Geometry
• Manufacturing
• Saddle system
• Mounting
• Surface finish
• Product mass
• Setup

They should not be interpreted as statements that every object made from the same alloy must sound identical.

ONE: The Brass Direction

The KMS ONE uses a CNC-machined C36000 H02 brass bridge body.

Its intended response emphasizes:

• Body
• Weight
• Sustain
• Fundamental authority
• Low-frequency substance
• Strong low mids
• Mechanical solidity

The guitar often feels more substantial rather than merely louder in the bass.

More Body

Body describes the perceived size and completeness of the note.

A bridge in the ONE direction can help when a guitar feels:

• Thin
• Lightweight
• Weak in the fundamental
• Too sharp in its attack
• Lacking substance
• Insufficiently authoritative

The intention is not simply to remove treble.

It is to give the note greater physical presence.

Low-End Authority

Low-end authority combines:

• Strong fundamental
• Stable decay
• Perceived weight
• Controlled low frequencies
• Substantial response under the hand

Brass can add low-frequency presence while a precisely machined bridge preserves articulation.

Authority should not be confused with uncontrolled bass.

Low-Mid Substance

The low-mid range contributes to:

• Note size
• Chord weight
• Perceived warmth
• Guitar-body presence
• Sustain character

A guitar with little low-mid energy can feel:

• Small
• Thin
• Detached
• Overly sharp

The ONE direction is useful when this range needs more support.

Sustain

The ONE direction emphasizes a long and substantial decay.

Sustain is not treated only as duration.

The target includes:

• Stable fundamental
• Note weight during decay
• Continued harmonic structure
• Strong physical response
• Controlled fade

The actual result depends on the complete guitar.

Attack

Brass should not automatically be described as slow or dull.

The CNC-machined construction provides:

• Defined saddle support
• Stable geometry
• Accurate contact
• Precise adjustment

The attack can remain clear while the note develops with greater body.

When ONE Is the Stronger Direction

ONE is generally appropriate when the guitar needs:

• More body
• More weight behind the note
• Stronger low mids
• Greater sustain
• Greater low-end authority
• A more substantial response
• Modern precision

It can be especially useful for a guitar that is:

• Naturally bright
• Lightweight
• Thin in the fundamental
• Fast but lacking depth
• Clear but not powerful

When Brass May Be Too Much

A guitar that is already:

• Very dense
• Strong in the low mids
• Compressed
• Slow to respond
• Heavy in the bass

may not need additional brass mass or substance.

In that case, the result can become:

• Too dense
• Less open
• Overly weighted
• Slower in perceived response
• Congested in a complex mix

This is not a flaw in brass.

It is a mismatch between material direction and guitar.

Vintage ONE: The ZAMAK Direction

The KMS Vintage ONE uses a vacuum die-cast and CNC-machined ZAMAK bridge body.

Its intended response emphasizes:

• Openness
• Liveliness
• Immediate dynamics
• Vintage-style movement
• Strong definition
• Lower perceived low-mid density
• Natural interaction with the guitar

Open Response

Open does not necessarily mean brighter.

It can describe:

• Less compression
• Greater dynamic movement
• More space between harmonic components
• Faster acoustic feedback
• Reduced perceived density
• More audible guitar character

The note can feel less mechanically weighted.

Lively Dynamics

A lively bridge direction responds clearly to changes in:

• Pick force
• Finger pressure
• Chord voicing
• Muting
• Vibrato
• Attack position

The player may experience the guitar as:

• More reactive
• More elastic
• More acoustic
• More connected to touch

Vintage-Style Response

Vintage character is not defined by inaccuracy.

It can include:

• Lower bridge-body mass than brass
• Zinc-alloy casting construction
• Brass saddle contact
• Non-overbuilt geometry
• Open dynamic behavior
• Familiar Tune-O-Matic response

Vintage ONE preserves this direction while improving the manufacturing precision of the final bridge.

Definition Without Excessive Density

A guitar can have strong note separation without a hard or clinical response.

The Vintage ONE direction aims for:

• Clear chords
• Audible string separation
• Open decay
• Defined attack
• Reduced low-mid masking

The result is not intended to be a weak version of ONE.

It is a different voicing.

When Vintage ONE Is the Stronger Direction

Vintage ONE is generally appropriate when the guitar needs:

• More openness
• More acoustic liveliness
• Less low-mid density
• More dynamic movement
• Vintage-style response
• Strong definition without additional weight
• Preservation of traditional construction character

It can be especially useful for a guitar that is:

• Dense
• Compressed
• Heavy
• Slow
• Overly smooth
• Strong in the low mids but weak in openness

When ZAMAK May Be the Wrong Direction

A guitar that is already:

• Thin
• Lightweight
• Weak in the fundamental
• Lacking sustain
• Sharp without body
• Insufficiently authoritative

may benefit more from the ONE brass direction.

Again, this is a matter of matching the bridge to the instrument.

Brass vs. ZAMAK Is Not Modern vs. Obsolete

Brass is not automatically modern because it is CNC-machined.

ZAMAK is not obsolete because it is cast.

The two approaches answer different design questions.

ONE Asks:

How can the bridge add:

• Body
• Weight
• Authority
• Sustain
• Precision?

Vintage ONE Asks:

How can the bridge preserve:

• Openness
• Liveliness
• Vintage-style behavior
• Definition

while providing modern dimensional accuracy?

Stronger Is Not Automatically Better

A bridge must be strong enough to perform its function.

Beyond that requirement, the highest possible material strength is not automatically the best tonal goal.

Greater strength may allow:

• Thinner geometry
• More compact components
• Greater load capacity

It does not automatically provide:

• Better tone
• More sustain
• More musicality
• Better compatibility

Strength is an engineering requirement.

Voicing is a product-design decision.

Heavier Is Not Automatically Better

Greater bridge mass can support the ONE direction.

It can also be unsuitable for a guitar that already feels dense.

Likewise, lower mass can support Vintage ONE openness but may not add the authority a thin guitar needs.

The correct question is not:

Which bridge is heavier?

The correct question is:

Which mechanical and tonal response does this guitar need?

Vintage Is Not the Absence of Precision

The phrase vintage-style should not be used to justify:

• Loose tolerances
• Rattle
• Weak threads
• Misaligned saddles
• Poor intonation
• Uncontrolled casting quality

Vintage ONE separates:

• Desired material and construction character
• Undesired manufacturing inconsistency

The result is a deliberately engineered vintage direction.

Saddles and Mounting

Bridge Body vs. Saddle Voicing

The bridge body establishes the broad direction.

The saddles can refine it.

Examples include:

Brass Body with Brass Saddles

Direction:

• Maximum continuity of the brass voicing
• Body
• Weight
• Fundamental authority

ZAMAK Body with Brass Saddles

Direction:

• Open bridge-body behavior
• Substantial and familiar saddle contact
• Vintage-style mixed-material construction

Body with Stainless-Steel Wound-String Saddles

Direction:

• Greater low-string definition
• Focused attack
• Improved separation

Brass Plain-String Saddles

Direction:

• Body
• Smoothness
• Substantial treble-string response

This makes material selection more precise than choosing one alloy for every component.

High-Gain Applications

Under high gain, a guitar can suffer from:

• Low-mid congestion
• Compressed attack
• Poor chord separation
• Loose low end

The better choice depends on the source of the problem.

Choose ONE When:

The guitar needs:

• More fundamental authority
• Greater note size
• More sustain
• Stronger low-frequency weight

Choose Vintage ONE When:

The guitar needs:

• More openness
• Less density
• Greater dynamic movement
• Clearer separation

For maximum tightness and speed, a Grade 5 titanium system may provide a third material direction.

Clean and Low-Gain Applications

Clean sounds reveal:

• Attack shape
• Dynamic range
• Harmonic bloom
• Decay
• Acoustic interaction

ONE can add:

• Depth
• Body
• Weight
• Stable sustain

Vintage ONE can add:

• Air
• Liveliness
• Chord openness
• Touch sensitivity

Neither direction is limited to one musical genre.

Choosing ONE or Vintage ONE

How to Choose Between ONE and Vintage ONE

Begin with the guitar rather than the material.

Describe the guitar as it currently behaves.

Possible characteristics include:

• Thin
• Dense
• Bright
• Dark
• Open
• Compressed
• Fast
• Slow
• Powerful
• Weak
• Clear
• Congested
• Lightweight
• Heavy

Then define the intended change.

Choose ONE When the Guitar Needs:

• More body
• Greater note weight
• More low-end authority
• Stronger low mids
• Longer and more substantial sustain
• A more solid mechanical response
• Greater fundamental presence
• Precision with a dense material direction

Choose Vintage ONE When the Guitar Needs:

• More openness
• Greater liveliness
• Less low-mid density
• More dynamic movement
• Strong definition
• Vintage-style response
• Lower bridge-body mass
• Precision without abandoning the cast zinc-alloy direction

Reinforcing vs. Balancing

A bridge can either reinforce the existing guitar or balance it.

Reinforcing

Examples:

• ONE on an already powerful guitar for maximum authority
• Vintage ONE on an already lively guitar for maximum openness

This can create a more specialized instrument.

Balancing

Examples:

• ONE on a thin guitar to add body
• Vintage ONE on a dense guitar to create space

This can create a more even instrument.

Both approaches are valid.

The player must decide whether the goal is:

• Enhancement
• Correction
• Specialization

Questions Before Choosing

Ask:

1. Does the guitar lack body or openness?
2. Is the low end weak or congested?
3. Does the note feel light or excessively dense?
4. Is the attack too sharp, too soft or well balanced?
5. Is sustain lacking, or is the decay merely unclear?
6. Are the wound strings defined?
7. Do the plain strings have sufficient body?
8. Is the existing bridge loose or structurally damaged?
9. Is the problem really the bridge?
10. Which mounting system is installed?

Tonal Problem vs. Mechanical Problem

Do not use material choice to solve a fault that requires repair.

Mechanical problems include:

• Loose posts
• Moving bushings
• Collapsed bridge
• Damaged saddle slots
• Rattling intonation screws
• Incorrect radius
• Insufficient intonation range
• String contact with bridge body
• Wrong bridge height
• Incompatible mounting

Correct the fault first.

Then assess the tonal direction.

Compatibility Comes Before Material

Before replacing a bridge, confirm:

• Bridge type
• Post spacing
• Upper post diameter
• Post thread
• Bushing dimensions
• Required bridge height
• String spacing
• Fretboard radius
• Saddle radius
• Intonation range
• Tailpiece clearance
• Finish
• Locking requirements

A bridge made from the preferred material is not an upgrade when it does not fit correctly.

ABR-1 and Nashville Considerations

ABR-1 and Nashville-style bridges can appear similar but use different mounting constructions.

Check whether the guitar has:

• Traditional direct posts
• Nashville-style bushings
• Metric direct posts
• Large metric bushings
• Conversion hardware
• Hybrid replacement posts

Do not select ONE or Vintage ONE from appearance alone.

KMS ONE 2 and Conversion Posts

The locking ONE 2 uses a defined 6-32 mounting geometry.

Where a guitar has compatible Nashville-style inserts or body-hole classes, KMS Conversion Posts may be used to establish the required 6-32 geometry.

The Conversion Posts replace the original bridge bushings.

Current KMS dimensions include:

Small Conversion Post

• Lower press-fit section: Ø 7.2 × 14 mm
• Upper thread: 6-32
• Upper height: 14 mm

Large Conversion Post

• Lower press-fit section: Ø 12.2 × 18.5 mm
• Upper thread: 6-32
• Upper height: 14 mm

The 7 mm and 12 mm descriptions refer to approximate body-hole classes after removal of the original bushings.

They do not describe:

• Bridge-post spacing
• Upper thread size
• Exact outside bushing diameter of every guitar

Reversibility

A Conversion Post installation is designed to remain reversible when:

• Original body holes remain intact
• Correct removal and installation tools are used
• Wood and finish are not damaged
• No uncontrolled adhesive or modification is introduced

Reversibility does not mean risk-free removal.

Pressed components should be serviced with suitable axial tools.

Saddle Selection

After selecting the bridge-body direction, consider the saddles.

Choose Brass Saddles for:

• More body
• Greater note weight
• A substantial plain-string response
• Smooth but defined attack

Choose Stainless-Steel Saddles for:

• More wound-string definition
• Focused attack
• Tight low strings
• Greater articulation

Choose V-Saddles for:

• Defined centering
• Broad string-gauge compatibility
• Gauge changes without conventional slot filing
• Controlled contact geometry

Do not file conventional slots into KMS V-saddles.

Finish Selection

Available finishes may include product-specific versions of:

• Nickel
• Aged nickel
• Black nickel
• Gold
• Other defined KMS finishes

The finish should be selected according to:

• Existing guitar hardware
• Desired aging behavior
• Contact function
• Product availability

Finish names and layer systems should be confirmed for the exact bridge version.

Plating Does Not Replace the Base Material

A decorative metallic finish is thin compared with the bridge body.

It does not convert:

• Brass into ZAMAK
• ZAMAK into brass
• One bridge-body mass into another

However, surface systems can influence:

• Corrosion behavior
• Wear
• Friction
• Appearance
• Component fit when thickness is poorly controlled

The substrate establishes the structural baseline.

The surface defines the interface.

Natural Brass

Unplated brass can develop patina through exposure to:

• Air
• Moisture
• Sweat
• Salts
• Skin oils

Possible changes include:

• Darkening
• Brown coloration
• Uneven aging
• Green corrosion products under aggressive contamination

Natural aging can be desirable when it is part of the product concept.

Do not use abrasive metal polish unless the intended surface permits it.

Plated ZAMAK

Zinc-alloy components are commonly plated or otherwise finished.

Successful finishing depends on:

• Clean casting surface
• Proper preparation
• Controlled porosity
• Suitable intermediate layers
• Adhesion
• Uniform thickness

Damage to the finish can expose the zinc alloy and allow local oxidation.

The quality of the finish stack matters.

Maintenance

After playing:

• Wipe the bridge with a soft dry cloth.
• Remove visible sweat.
• Do not leave moisture around screws.
• Avoid aggressive cleaners.
• Do not use metal polish on plated or aged finishes without confirmation.
• Check for corrosion around saddle slots and screws.
• Keep tools away from finished surfaces.

Maintenance preserves:

• Appearance
• Adjustment
• Thread condition
• Saddle contact
• Long-term serviceability

KMS Design Principles

How to Compare Brass and ZAMAK Fairly

A useful comparison should control as many variables as possible.

Use:

• The same guitar
• The same string type and gauge
• Strings of comparable age
• The same tuning
• Matched action
• Matched bridge height
• Correct radius
• Correct intonation
• Similar tailpiece position
• Identical pickup height
• Identical amplifier and recording settings

Also document:

• Bridge weight
• Saddle material
• Post system
• Locking construction
• Break angle
• String contact

Same Material Is Not the Same Bridge

A comparison between two bridges often changes several variables simultaneously:

• Material
• Mass
• Geometry
• Saddle type
• Post fit
• Intonation screws
• Retainer
• Locking
• Finish

The result belongs to the complete bridge replacement.

Do not attribute every difference to one alloy property.

Listening Evaluation

Evaluate:

• Acoustic response
• Amplified clean response
• High-gain response
• Attack
• Note body
• Chord separation
• Low-string behavior
• Sustain
• Decay quality
• Playing feel

Use repeated passages.

Where practical:

• Record a direct signal.
• Match levels.
• Avoid changing pickup or amplifier settings.
• Compare blind.
• Repeat the test on another day.

A louder sample is often perceived as better.

Level matching is essential.

Common Comparison Mistakes

Avoid:

• Comparing bridges with different action
• Ignoring saddle material
• Ignoring finished bridge mass
• Changing strings between samples without accounting for it
• Using different posts
• Ignoring tailpiece break angle
• Confusing rattle removal with tonal change
• Comparing a damaged bridge with a new bridge
• Assuming heavier means more sustain
• Selecting by material before checking compatibility
• Treating player descriptions as fixed frequency measurements

Which Material Is Better?

Neither material is universally better.

The better choice is the bridge that provides the intended response in the actual guitar.

ONE Is the Better Choice When:

The guitar needs:

• Body
• Weight
• Sustain
• Low-end authority
• Low-mid substance
• A more substantial response

Vintage ONE Is the Better Choice When:

The guitar needs:

• Openness
• Liveliness
• Vintage-style dynamics
• Strong definition
• Reduced low-mid density
• A more immediate response

The KMS Consultation Principle

The best ONE configuration depends not only on the guitar model.

It also depends on:

• The guitar’s basic character
• Existing hardware
• String gauges
• Playing style
• Upgrade goal

Material selection should therefore be treated as a tonal consultation rather than a universal product ranking.

Related Guides

• How Guitar Bridge Material Affects Tone →
• Titanium in Guitar Hardware: Why Grade 5 Matters →
• CNC Precision in Guitar Bridge Manufacturing →
• Choosing Guitar Saddle Materials →
• Decorative Finishes vs. Functional Coatings →