Custom Bronze Components

Custom Bronze CNC Machining

Bronze combines wear resistance, low-friction sliding behavior and corrosion resistance. Send your drawing for a grade, tolerance and production-route review with a clear custom machining quote.

±0.05 mmStandard dimensional tolerance

Ra 0.8–3.2Typical machined roughness, µm

Prototype–BatchScalable production support

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Material Performance

Key Properties of Machined Bronze Alloys

Bronze properties vary widely with alloy family, product form and temper. These ranges cover common bearing, aluminum, nickel-aluminum and silicon bronzes.

Bronze raw material stock for CNC machining

Tensile strength207–760 MPa

Yield strength95–345 MPa

Brinell hardness60–230 HB

Density7.45–9.25 g/cm³

Elastic modulus100–110 GPa

Electrical conductivity7–15% IACS

Use the specified UNS grade and material condition for design. Final values must follow the applicable material certificate and standard.

Bronze Alloy Selection

Bronze Families for CNC-Machined Parts

Compare common bronze families by material performance, international grade, typical parts and finishing requirements. Confirm the alloy, temper, product form and service conditions before production.

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Tin Bronze Phosphor Bronze Aluminum Bronze Beryllium Bronze Silicon Bronze Manganese Bronze Leaded Bronze

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Tin Bronze

Tin bronze combines high load capacity, wear resistance and corrosion resistance in seawater and brines. It is used for bushings, bearings, gears, valve guides, pump components and piston rings in marine equipment, power transmission and heavy machinery.

Common International Grades Cast grades: UNS C90300, C90500 and C90700.

Surface Finishing Precision turning, boring, honing, grinding and polishing. Tin or nickel plating is applied only when required by the drawing and service environment.

Engineering note: Tin bronze does not readily embed dirt or compensate for severe shaft misalignment. Bearing applications require clean lubricant, controlled clearance and a suitable mating-shaft hardness.

Phosphor Bronze

Phosphor bronze provides high elasticity, fatigue strength, wear resistance and stable electrical-contact performance. It is used for springs, electrical contacts, clips, thrust washers, small bushings and worm gears in electronics, instruments and precision mechanisms.

Common International Grades Wrought grades: UNS C51000, C51900 and C52100.

Surface Finishing Deburring, polishing, brushing and anti-tarnish protection. Tin, nickel, silver or gold plating is selected for electrical contact and corrosion requirements.

Engineering note: Specify temper, strip thickness and grain direction for springs and stamped contacts. These factors control forming performance, spring force and fatigue life.

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Aluminum Bronze

Aluminum bronze offers high strength, impact resistance, elevated-temperature strength and strong resistance to seawater and cavitation. It is used for heavy-duty bushings, gears, valve seats, impellers, wear plates and marine hardware in offshore systems, pumps and industrial machinery.

Common International Grades Wrought grades: UNS C61400 and C63000. Cast grades: UNS C95400 and C95800.

Surface Finishing Precision machining, grinding, polishing and controlled abrasive blasting. Plating requires a qualified pretreatment process to achieve reliable adhesion.

Engineering note: Aluminum bronze has limited conformability and dirt-embedding capacity. Bearing surfaces require accurate alignment, a smooth mating shaft and reliable lubrication.

Beryllium Bronze

Precipitation-hardened beryllium bronze delivers high strength, elasticity, fatigue resistance, nonmagnetic performance and useful electrical conductivity. It is used for precision springs, electrical contacts, diaphragms, bushings, mold inserts and qualified non-sparking tools.

Common International Grades Wrought grades: UNS C17200, C17300 and C17510.

Surface Finishing Precision polishing and anti-tarnish protection. Nickel, tin, silver or gold plating is selected for electrical, soldering and corrosion requirements.

Safety note: Machining, grinding and polishing require effective dust extraction and exposure controls. Dry processes must not release beryllium-containing dust into the workplace.

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Silicon Bronze

Silicon bronze combines corrosion resistance, strength, formability and reliable joining performance. It is used for fasteners, valve stems, pump parts, fittings, brackets and architectural hardware in marine, outdoor and industrial environments.

Common International Grades Wrought grades: UNS C65100, C65500 and C65600.

Surface Finishing Mechanical polishing, brushing, bead blasting, patination and clear protective coating. Decorative plating is applied when specified.

Engineering note: The selected grade and product form determine strength, machinability and forming response. The RFQ should identify whether bar, plate, tube, forging or casting is required.

Manganese Bronze

Manganese bronze provides high strength, impact resistance and dependable performance under heavy loads. It is used for bridge bearings, rolling-mill nuts, bushings, gears, guides and wear plates in mining, construction, lifting and steel-processing equipment.

Common International Grades Cast commercial grades: UNS C86200, C86300 and C86400.

Surface Finishing Precision machining, grinding and polishing. Protective oil, wax, lacquer or specified plating protects non-working surfaces during storage and service.

Classification note: “Manganese bronze” is an established commercial name. The UNS system places C86200–C86400 within the high-strength yellow-brass group. The exact UNS number must therefore appear on the drawing.

Leaded Bronze

Leaded bronze offers excellent machinability, low friction, conformability and resistance to seizure. It is used for sleeve bearings, bushings, thrust washers and pump bearings operating at moderate loads and speeds, including systems with intermittent or boundary lubrication.

Common International Grades Cast high-leaded tin bronze grades: UNS C93200, C93600 and C93700.

Surface Finishing Precision turning, boring, honing and lubricant-groove machining. Bearing faces remain accurately machined; protective oil or specified plating is limited to suitable non-working surfaces.

Compliance note: These grades contain lead. The RFQ must define potable-water, food-contact, medical, RoHS and market-specific restrictions before material approval.

Drawing-Based Capability

Bronze CNC Machining Parameters

Final capability is confirmed from the alloy, casting condition, wall thickness, geometry, tolerance and inspection method.

Standard tolerance±0.05 mm

Selected precision featuresDown to ±0.01 mm

Machined roughnessRa 0.8–3.2 µm

Typical minimum wall0.8 mm

CNC milling envelopeUp to 3000 × 1600 × 1000 mm

CNC turning capacityUp to Ø200 × 1000 mm

Control Tool Adhesion

Sharp tools and positive geometry reduce rubbing, smearing and built-up edge.

Match the Alloy

Bearing bronze and aluminum bronze require different speeds, feeds and tool strategies.

Protect Thin Walls

Light, distributed clamping limits distortion in bushings, sleeves and split components.

Verify Functional Bores

Bearing diameters, roundness and alignment are checked from the drawing datum system.

Machined Bronze Projects

Custom Bronze CNC Parts

Prototype, small-batch and repeat production for bushings, housings, fittings and precision mechanical components.

Bronze Post-Processing

Surface Finishes for Bronze Parts

Select the finish according to corrosion exposure, wear, friction and appearance requirements. Critical fits and bearing surfaces are protected during finishing.

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Polishing & Brushing

Removes machining marks and creates a smooth satin or bright surface.

Bead Blasting

Produces a uniform matte texture and prepares the surface for coating.

Chemical Patina

Creates controlled brown, black or aged tones through a surface reaction.

Corrosion-Inhibiting Seal

BTA-based treatment with clear lacquer or wax limits tarnishing.

Metal Plating

Nickel, chrome, tin, silver or gold modifies protection, conductivity or appearance.

Quality Control

From Drawing Review to Final Inspection

Critical interfaces are identified before production and verified before approved parts are packed.

01 · Material ReviewGrade, casting route, condition and certificate requirements are confirmed.

02 · Datum ControlWorkholding and machining sequences preserve critical relationships.

03 · In-Process CheckBores, threads, wall thickness and functional dimensions are monitored.

04 · Final VerificationCMM and optical measurement verify drawing requirements.

Project Questions

Plan Your Bronze Machining Project

Is brass easily machinable?

Yes. Free-machining grades such as C36000 cut quickly and produce short chips. Lead-free and high-strength brass require adjusted tooling, feeds and cooling.

What are the challenges of machining bronze?

Bronze grades differ greatly in hardness, abrasiveness and chip behavior. Sharp tools, rigid setups and controlled cutting parameters reduce tool wear, burrs and dimensional variation.

How can bronze part machining costs be reduced?

Choose a machinable grade and standard stock size, limit tight tolerances to functional features, avoid unnecessarily deep or narrow geometry, and combine parts into efficient production batches.