Precision CNC Machining for Bronze Alloys
Expert CNC machining of C93200, C95400, C51000 and specialty bronze grades. Self-lubricating bearings, corrosion-resistant marine parts, and precision components with material certifications.
Bronze Alloy Materials
MetaliCNC machine all major bronze grades, from standard bearing bronze to high-strength aluminum and manganese bronzes.
SAE 660
Added sulfur improves machinability. Ideal for complex parts requiring extensive machining.
Aluminum Bronze
C95400
High-strength aluminum bronze with excellent corrosion resistance, especially in seawater and acidic environments.
Ni-Al Bronze
C95500
Higher strength version of aluminum bronze with nickel addition for improved mechanical properties and corrosion resistance.
Phosphor Bronze
C51000
Free-machining martensitic grade that can be hardened by heat treatment.
Free-Cutting
Lead-added version of phosphor bronze for improved machinability while retaining good mechanical and electrical properties.
Red Brass
C83600
Also known as “Composition Bronze” or “Ounce Metal.” Excellent castability and corrosion resistance for valve and fitting applications.
Manganese Bronze
C51000
High-strength alloy with excellent wear resistance and load-bearing capacity. Can be heat treated for higher strength.
Silicon Bronze
C65500
Excellent corrosion resistance and weldability. Often used for architectural applications and corrosion-resistant hardware.
Other materials: see the dedicated pages for brass and copper, carbon and alloy steel, and engineering plastics.
Material Comparison Guide
Compare key properties to select the right bronze alloy for your application.
| Alloy | Strength | Corrosion Resistance | Machinability | Wear Resistance | Relative Cost |
|---|---|---|---|---|---|
| C93200 (SAE 660) | Good | Good | Excellent | Good | $ |
| C95400 (Al-Bronze) | Excellent | Excellent | Good | Excellent | $$ |
| C95500 (Ni-Al) | Superior | Superior | Moderate | Excellent | $$$ |
| C51000 (Phosphor) | Good | Good | Good | Moderate | $$ |
| C54400 (Free-Cut) | Good | Good | Excellent | Moderate | $$ |
| C83600 (Red Brass) | Moderate | Good | Excellent | Moderate | $ |
| C86300 (Manganese) | Superior | Good | Moderate | Superior | $$ |
| C65500 (Silicon) | Good | Excellent | Good | Good | $$ |
CNC Machining Capabilities
Processes set up for bronze: bore and thread sizes held, wear surfaces finished as specified, inspection against your drawing.
Tight Tolerances
±0.01 mm
Standard tolerance for precision features. Even tighter tolerances available upon request.
Part Size
Up to 1000mm
Maximum machining envelope. Larger parts available with special setup.
Multi-Axis CNC
3, 4 & 5 Axis
Complex geometries and reduced setup times with multi-axis machining centers.
Production Volume
1 to 10,000+
From single prototypes to high-volume production runs with consistent quality.
Lead Time
2–4 Weeks
Standard lead time for bronze parts. Expedited service available.
Documentation
MTR & CoC
Material test reports (MTR), certificates of conformance, full traceability.
Related processes: features a cutter cannot reach are cut on our wire EDM machines; tight shaft and bore fits, and finishes finer than milling can hold, come from CNC grinding. If you want the geometry proven before a production run, start with rapid prototyping and low-volume production.
Bronze Surface Finishing
Complete finishing services to enhance appearance, corrosion resistance, and performance.
Protective Treatments
Prevent oxidation and enhance corrosion resistance for long-term durability.
- Chemical Passivation
- Anti-Oxidation Coating
- Lacquer Coating (Clear/Colored)
- Wax Coating
- Oil Impregnation
Aesthetic Finishes
Decorative finishes to enhance the natural beauty of bronze.
- Mirror Polishing
- Satin/Brushed Finish
- Antique Patina
- Bead Blasting
- Tumbling/Barrel Finishing
Functional Treatments
Engineered surfaces for specific mechanical or chemical properties.
- Precision Grinding
- Lapping (Super Finish)
- Honing
- Heat Treatment (Select Alloys)
- Laser Marking/Engraving
Industries & Applications
Bronze CNC machined parts for demanding industries worldwide.
Marine & Offshore
Propellers, valves, pumps, and hardware requiring superior corrosion resistance in seawater environments.
Industrial Automation
Self-lubricating bearings, bushings, thrust washers and wear pads for automated machinery and conveyors.
Electrical & Electronics
Connectors, contacts, springs, and terminals requiring good conductivity and spring properties.
Industrial Valves & Pumps
Valve bodies, stems, seats, and pump components for fluid handling systems.
Heavy Machinery
Bearings, bushings, worms and wear components for industrial equipment.
Art & Architecture
Sculptures, decorative hardware, and architectural elements with beautiful golden patina.
Frequently Asked Questions
What is the difference between C93200 and C95400 bronze?
Which bronze alloy is best for marine applications?
For marine applications, C95400 aluminum bronze and C95500 nickel-aluminum bronze are the top choices due to their excellent corrosion resistance in seawater. C65500 silicon bronze is also a good option for marine hardware that requires welding. For propellers and heavy-duty marine components, C95500 offers the best combination of strength and corrosion resistance.
Which bronze is easiest to machine?
C93200 bearing bronze and C83600 red brass are the easiest to machine due to their lead content. C54400 free-cutting phosphor bronze is also excellent for machining. Aluminum bronzes (C95400, C95500) are more difficult to machine due to their hardness but offer superior strength and corrosion resistance.
What file formats do you accept for designs?
3D+2D drawings, preferred formats below:
- STEP (.stp)
- IGES (.igs)
- PDF drawings (with GD&T callouts)
What are your standard lead times?
Standard lead time is 2–4 weeks. Rush orders are confirmed case by case — tell us your deadline up front and we will say straight away whether we can hit it.
Do you offer design assistance?
We review every drawing before quoting. If we find a feature that cannot be machined as drawn, or one that adds cost without adding function, we point it out and suggest an alternative for you to confirm. If the drawing is machinable as it stands, we quote it as-is — we do not redesign parts that already work.
What is your minimum order quantity?
We don’t have a minimum order quantity. We can produce a single prototype or thousands of parts depending on your needs.
What is your return policy?
At MetaliCNC, every product goes through strict verification—from trial production and inspection testing to customer confirmation—before shipment. Our quality assurance process ensures that all parts meet the agreed specifications before delivery, minimizing the risk of nonconformities. We take pride in our precision and reliability, and every shipment is the result of a joint confirmation between our engineers and customers.
In the rare event that a delivered part does not meet the agreed specifications, we follows a transparent and responsible after-sales process. Customers can submit a claim with inspection data, photos, or videos clearly indicating the nonconforming features. Our quality team will review the case within 48 hours to identify root causes—whether related to design, machining, material, or logistics.
Based on the assessment, we provide appropriate solutions such as rework, remake, partial refund, or credit, in line with the order terms. All cases are fully documented and backed by inspection records to ensure traceability. To help us resolve issues faster, customers should retain original samples and all supporting evidence. Each case also feeds into our continuous improvement system to further enhance product quality and customer satisfaction
Ready to Start Your Bronze Project?
Get an instant quote for CNC machining your bronze parts. Upload your CAD files and receive pricing within 48 hours in the normal case.