Brass & Copper Parts is a globally recognized manufacturer specializing in Brass Screw Machining — delivering precision brass screw machine parts and components to customers across the USA and international markets. Our state-of-the-art automatic screw machines and CNC Swiss-type turning centers process a full range of brass alloys to produce complex, high-tolerance components at competitive prices and fast turnaround times.
What Is Brass Screw Machining?
Brass screw machining is a high-speed subtractive manufacturing process in which brass bar stock is fed through an automatic or CNC screw machine (multi-spindle or single-spindle) and machined into precise turned components. This process is highly efficient for producing large quantities of small brass parts with consistent dimensions, excellent surface finishes, and complex geometrical features including threads, grooves, knurls, and bores — all in a single setup.
Brass is the most widely used material in screw machine production because of its exceptional machinability rating (C36000 free-cutting brass achieves a machinability rating of 100 — the industry benchmark), attractive appearance, corrosion resistance, and suitability for plating and finishing operations.
Our Range of Brass Screw Machine Parts & Components
We manufacture a comprehensive catalog of precision brass screw machined components for OEMs, distributors, and contract manufacturers in the USA:
Brass Turned Parts & CNC Machined Components
Precision brass turned parts with tight tolerances and complex features — including stepped shafts, grooved cylinders, hexagonal profiles, and multi-diameter components — produced using automatic and CNC turning technology.
Brass Threaded Screws, Bolts & Fasteners
Custom brass machine screws, set screws, thumb screws, and specialty fasteners machined to ASME B18.6.3, ANSI, or customer-specified standards. Available in all standard and custom thread forms including UNC, UNF, and metric.
Brass Fittings & Hydraulic Connectors
Precision brass fittings — compression fittings, flare fittings, barb fittings, push-to-connect fittings, and custom adapters — for gas, water, refrigeration, pneumatic, and hydraulic systems. Manufactured to SAE, ASTM B16.26, and NSF 61 standards.
Brass Bushings & Bearings
Plain bronze and yellow brass bushings, flanged bushings, and self-lubricating sleeve bearings produced from C36000, C26000, and leaded brass alloys. Used in motors, pumps, gearboxes, and precision mechanical assemblies.
Brass Standoffs, Spacers & Pillars
Round, hex, and square brass standoffs and spacers for PCB assembly, electronic enclosures, and precision instrument applications. Available threaded (M/F), unthreaded, and in custom configurations.
Brass Inserts & Threaded Inserts
Knurled brass press-in, heat-set, and ultrasonic inserts for plastics and composites (compatible with DIN 16903 / ANSI standards). Essential for electronics, consumer products, and automotive interiors.
Brass Electrical Components & Contacts
Custom brass terminals, switch contacts, connector pins, lugs, and bus bar fittings for the electrical, electronics, and telecommunications industries. Available tinned, nickel-plated, or in as-machined finish.
Brass Valves & Valve Bodies
Precision brass valve bodies, valve seats, stems, and plug components for gas and water shut-off valves, metering valves, and ball valves. Machined to exact bore diameters and seat angles for leak-free performance.
Brass Nozzles & Jets
Precision orifice nozzles, fuel injector components, and spray nozzles with calibrated bore diameters — essential for carburetors, burners, fuel systems, and fluid control applications.
Brass Material Grades for Screw Machining & International Equivalents
We machine all standard brass alloys. The following table lists the most commonly used grades with their international equivalents:
| Grade / Alloy | UNS (USA) | BS (UK) | DIN (Germany) | JIS (Japan) | Machinability | Key Use |
|---|---|---|---|---|---|---|
| Free-Cutting Brass (360 Brass) | C36000 | CZ121 | CuZn39Pb3 (2.0401) | C3604 | 100% | High-speed screw machining, fasteners |
| Leaded Naval Brass | C36500 | CZ132 | CuZn38Sn1 (2.0530) | — | 90% | Marine fittings, valve bodies |
| High-Leaded Brass | C38500 | — | CuZn39Pb3 (2.0401) | C3771 | 90% | Forgings, high-speed machining |
| Cartridge Brass (260 Brass) | C26000 | CZ106 | CuZn30 (2.0265) | C2600 | 30% | Deep drawing, springs, connectors |
| Yellow Brass (270 Brass) | C27000 | CZ107 | CuZn36 (2.0335) | C2700 | 40% | General hardware, stampings |
| Architectural Bronze (385 Brass) | C38500 | CZ122 | CuZn39Pb2 (2.0380) | C3771 | 80% | Architectural, plumbing fittings |
| Naval Brass (464 Brass) | C46400 | CZ112 | CuZn38Sn1 (2.0530) | C4640 | 30% | Marine, heat exchangers |
Why C36000 Free-Cutting Brass Is the Industry Standard for Screw Machine Parts
C36000 (also called 360 Brass or free-cutting brass) is the gold standard for screw machine production. With a machinability rating of 100 — the highest of any commercially available metal — it allows the fastest cutting speeds, produces clean chip breakage, and delivers the best surface finish of any brass alloy. Its composition (approximately 61.5% Cu, 35.5% Zn, 3% Pb) provides an excellent balance of strength, corrosion resistance, and workability. For RoHS-compliant applications requiring low-lead alternatives, we also work with C27451 (ECO Brass) and other lead-free options.
Industries Served in the USA
- Plumbing & Water Treatment: Brass Fittings, valves, connectors, compression rings
- Electrical & Electronics: Brass Terminals, contacts, inserts, standoffs, bus bars, Brass male and female Conduit connectors and Adapters, Brass cable glands
- Automotive & Transportation: Fuel system parts, sensor housings, transmission components
- HVAC & Refrigeration: Metering valves, charge ports, flare fittings, Schrader valves, Brass Compression fittings, Brass tube fittings
- Gas & Petroleum: Needle valves, orifices, regulator components, meter bodies
- Instrumentation & Medical: Precision turned components, flow controllers, fittings
- Defense & Firearms: Cartridge cases, primer components, sight hardware
Why Choose Brass & Copper Parts for Brass Screw Machining?
- Machining Benchmark Performance: Specializing in C36000 and leaded brass alloys, our machines run at optimized speeds and feeds delivering superior piece-part economics.
- Tolerance Capability: Diameter tolerances to ±0.0005″ (±0.013 mm), concentricity within 0.001″ TIR on critical turned diameters.
- Volume Flexibility: From 500-piece engineering samples to multi-million-piece annual supply agreements with Kanban/JIT delivery.
- Complete Secondary Operations: In-house threading, milling, cross-drilling, slotting, knurling, and assembly — reducing your supply chain complexity.
- Surface Finishing: Tin plating, nickel plating, chrome plating, silver plating, zinc plating, passivation, and lacquering available through certified partners.
- ISO 9001:2015 Quality: Full dimensional inspection with CMM, optical comparators, thread gauges, and surface roughness measurement. PPAP and FAI documentation available.
- Competitive USA Market Pricing: Direct factory pricing with DDP (Delivered Duty Paid) options to any US port — no hidden import costs.
Frequently Asked Questions — Brass Screw Machining
Q1: What is the lead time for custom brass screw machine parts?
A: Standard lead time for production orders is 3–5 weeks from approved drawings. We offer expedited 2-week service for urgent requirements (subject to capacity). Sample/prototype orders can often be completed within 7–10 business days.
Q2: Can you machine brass parts to RoHS-compliant lead-free standards?
A: Yes. For applications where lead content must be minimized (e.g., NSF 61 drinking water contact, RoHS/REACH compliance), we use low-lead and lead-free brass alloys including C27451 (ECO Brass), C69300, and bismuth-modified alloys that maintain good machinability without lead.
Q3: What thread standards do you work to for brass fasteners?
A: We produce threads to all major standards: ASME B1.1 (Unified Inch Coarse/Fine — UNC/UNF), ASME B1.13M (Metric), ASME B1.5 (ACME), ASME B1.8 (Stub ACME), Whitworth (BSW/BSF), BA, and custom thread forms. Thread gauging is performed per ASME B47.1 with calibrated plug and ring gauges.
Q4: Do you supply brass screw machine parts with material certifications?
A: Yes. All orders are supplied with Mill Test Certificates (MTCs) showing full chemical analysis and mechanical properties. We also provide RoHS/REACH declarations, DFARS compliance statements, and country-of-origin documentation as required.
Q5: What is the smallest part size you can machine?
A: Our Swiss-type CNC machines can handle bar stock from 1 mm to 32 mm diameter. We regularly produce parts as small as 2 mm diameter with features including M2 threads and 0.8 mm bores. Maximum turned length is approximately 120 mm in a single setup.
Q6: Can you help us convert from a competitor’s part to your design?
A: Absolutely. Our engineering team offers full reverse engineering services — from physical part measurement to 3D CAD modeling and DFM (Design for Manufacturability) optimization — to help you switch sources seamlessly and cost-effectively.
Q7: Do you offer plating and finishing on brass screw machine parts?
A: Yes. We offer tin plating (bright and matte), nickel plating, chrome plating, silver plating, gold plating, black oxide, passivation, lacquering, and powder coating through certified finishing partners. All plating is done to ASTM, MIL-SPEC, and AMS standards where applicable.
Certifications & Standards Compliance
Brass & Copper Parts operates under ISO 9001:2015 certification. Our brass screw machine parts are produced in compliance with ASTM B16 (free-cutting brass rod), ASTM B124, SAE J461, and RoHS/REACH regulations. We support PPAP Level 1–5, ISIR, first article inspection, and ongoing process capability (Cpk) monitoring for production parts.
Get a Fast Quote on Brass Screw Machine Parts
Send your drawings, 3D models, or part samples to Brass & Copper Parts for a fast, no-obligation quotation. Our USA-focused technical sales team is ready to support you from prototype through production, with expert advice on material selection, tolerance optimization, and cost reduction. Contact us today — we typically respond within 24 hours.
