C360 Brass Screw Machine Parts, CDA 360 Brass Machining

C360 Brass Screw Machine Parts – CDA 360 Brass Machining

C360 Brass (UNS C36000, CDA 360, ASTM B16 Free-Cutting Brass, BS 2874 CZ121, EN CW614N) is universally recognized as the benchmark free-machining alloy in precision metal manufacturing. With a machinability index of 100% (the highest rating in the CDA copper alloy machinability scale), C360 brass is the material of choice for high-volume screw machine parts, CNC automatic lathe components, and precision turned parts across electrical, electronics, plumbing, automotive, and industrial sectors. Electrical Accessories India manufactures C360 CDA 360 brass screw machine parts and machined components to customer drawings, international standards, and proprietary OEM specifications, serving electrical OEMs, EPC contractors, power utilities, and global distributors with reliable, competitively priced, traceable supply.

Product Overview

C360 Alloy Profile – Metallurgy of Free-Cutting Brass

C36000 (C360 / CDA 360) contains 60–63% copper, 35.5–38% zinc, and 2.5–3.7% lead. The lead is present as uniformly distributed microscopic particles that act as internal chip-breakers during cutting, producing short, fragmented chips (Type 6 or 7 chip per ISO 3685) that clear the cutting zone rapidly. This enables the highest production rates on multi-spindle automatic screw machines, CNC Swiss-type lathes, and single-spindle automatics, with tool life 3–5× longer than carbon steel at equivalent production rates. Tensile strength of 340–430 MPa and yield strength of 140–210 MPa provide adequate structural performance for most fastener, fitting, and connector applications. Elongation of 25–40% indicates good ductility for press-fit, knurling, and staking operations without cracking. Hardness of 55–80 HRB allows reliable threading, knurling, and tapping in high-volume production without excessive tool wear. Electrical conductivity of approximately 26–28% IACS makes C360 suitable for current-carrying terminal blocks, bus connectors, and grounding components in low-voltage electrical assemblies.

Screw Machine Parts – Multi-Spindle and Single-Spindle Production

Electrical Accessories India operates multi-spindle automatic screw machines (Brown & Sharpe, Wickman, New Britain, and CNC multi-spindle configurations) and CNC Swiss-type lathes (Citizen, Star, Tornos) for high-volume C360 screw machine parts production. Bar stock diameters from 3 mm to 50 mm are processed at sustained production rates of 200–2,000 pieces per hour depending on component size and complexity. Typical screw machine parts include terminal pins, contact pins, electrical connector inserts, hex standoffs, threaded studs, shoulder screws, captive nuts, ferrules, cable gland bodies, compression ring olives, cable entry bodies, coupling nuts, clevis pins, and precision blanks. Chip conveyors, coolant filtration systems, and in-process gauging ensure production quality and dimensional consistency across long production runs. Batch sizes from 500 to 5,000,000 pieces are routinely handled; dedicated tooling and fixtures reduce changeover time to under 90 minutes for repeat jobs.

CDA 360 Brass CNC Machined Parts

For components requiring multi-axis features, tight tolerances, or complex geometries beyond screw machine capability, Electrical Accessories India uses CNC turning centers (2-axis and sub-spindle), CNC turn-mill centers (Y-axis, live tooling), and CNC machining centers for C360 CDA 360 brass CNC machined parts. Achievable tolerances are ±0.005–0.01 mm on turned diameters, ±0.01–0.02 mm on milled features, and ±0.025 mm on positional tolerances. CNC machined C360 parts include valve bodies, manifold blocks, hydraulic adapters, precision instrument fittings, sensor housings, encoder bodies, potentiometer shafts, actuator stems, busbar connectors, and custom hardware. CMM (Zeiss, Hexagon) inspection on first articles and AQL-based sampling inspection on production lots is standard. GD&T callouts (ASME Y14.5 or ISO 1101) are interpreted and reported in full inspection reports.

Electrical and Electronic OEM Components

C360 brass is the dominant material for electrical connector bodies, terminal block components, cable gland bodies, earthing terminal studs, distribution board fittings, switchgear components, busbar taps, current transformer terminal connectors, and instrument cluster housings in the electrical OEM sector. The alloy’s combination of high machinability, dimensional stability, electrical conductivity, and compatibility with tin, nickel, silver, and chrome plating makes it the preferred substrate for precision electrical components manufactured in volume. Electrical Accessories India produces C360 electrical components to IEC 60947, IEC 61439, IEC 60309, BS 88, and customer-specific drawings, with surface finishes optimized for solder joint, crimping, press-fit, and screw termination assembly methods. UL, CE, and ATEX component marking is available on request.

Plumbing and HVAC Fittings from CDA 360 Brass

Despite restrictions in potable water applications under NSF 372 and AB1953, C360 brass remains widely specified for industrial plumbing, HVAC fittings, compression fittings for copper tube, gas pipe fittings (non-potable), steam trap components, valve stems, gauge adaptors, and hydraulic line fittings in non-drinking water services. C360 fittings comply with ASME B16.26 (compression fittings), DIN 8076 (compression fittings), EN 1254-2 (capillary fittings), and MSS SP-104 for industrial and HVAC applications. Thread forms available include NPT, BSPP, BSPT, metric, and UN/UNF in sizes 1/8″–3″ or M6–M72. Pressure ratings to 25 bar at 100°C are achievable in standard wall-thickness fittings, with higher ratings available in heavy-duty configurations.

Fasteners, Inserts, and Hardware from C360 Brass

C360 brass is the standard material for commercial and precision fasteners including machine screws, hex bolts, hex nuts, square nuts, wing nuts, set screws, shoulder bolts, socket head cap screws, studs, threaded rod, and precision dowel pins. Heat-set threaded inserts, press-in inserts, ultrasonic inserts, and self-tapping inserts for thermoplastic assemblies are major C360 screw machine products, used extensively in electrical enclosure assembly, automotive interior components, consumer electronics, and medical device housings. Full-form thread rolling (as opposed to cut threading) is applied to C360 hex screws and studs to produce stronger, work-hardened threads per ASME B18.2.1 and DIN 933/931. Knurling (straight, diagonal, and diamond patterns to DIN 82) and cross-hole drilling are common secondary operations.

Automotive and Precision Instrument Parts

In automotive and precision instrument manufacturing, C360 CDA 360 brass is used for sensor body inserts, fuel system adapters, transmission shift linkage pins, carburetor and throttle body jets, ABS sensor housings, speedometer gear blanks, clock and instrument movement parts, and precision balance weights. The alloy’s dimensional stability after machining (low residual stress due to lead lubricant effect) makes it ideal for parts requiring tight bore-to-OD concentricity, such as bearing housings, collet body blanks, and precision sleeves. PPAP documentation, IMDS material data sheets, and REACH SVHC declarations are available for automotive supply chain compliance.

Pricing

C360 CDA 360 Brass Screw Machine Parts: US$ 11.50/kilogram (subject to order quantity, part complexity, surface finish, and packaging requirements. MOQ: 50 kg. Volume pricing for annual orders ≥500 kg.)

Key Features

• Machinability index 100% – highest rated copper alloy for screw machine production
• Tensile strength 340–430 MPa; hardness 55–80 HRB – adequate for most fastener and fitting applications
• Electrical conductivity 26–28% IACS – suitable for current-carrying terminal and bus components
• Short-chip machining – excellent for high-speed multi-spindle automatics and Swiss-type lathes
• Compatible with tin, nickel, silver, chrome, and zinc plating systems
• Available in drawn, extruded, and cold-drawn bar/rod (ASTM B16, B121; BS 2874 CZ121; EN CW614N)
• Wide bar stock range: 3–75 mm diameter, enabling full range of screw machine and CNC turned parts

Machinability and Production Economics

The 100% machinability rating of C360 translates directly into the lowest cycle times, highest production volumes, and best cost-per-piece economics of any copper alloy for screw machine and CNC turning operations. Compared to 303 stainless steel (machinability 45%), aluminium 2011 (machinability 300% – but lower density), or 1215 free-machining steel (machinability 136%), C360 brass offers the best balance of machining speed, tool life, dimensional accuracy, and corrosion resistance for electrical and industrial precision parts. On a 6-spindle automatic screw machine, C360 production rates of 1,000–2,500 small parts/hour (dia 3–10 mm) are achievable, making it highly cost-competitive versus CNC-only alternatives for volume production.

Corrosion Resistance and Surface Finishing

C360 brass provides reliable atmospheric corrosion resistance in industrial, commercial, and indoor environments. For demanding outdoor, coastal, and industrial applications, electroplated finishes (tin, nickel, chrome, silver) or conversion coatings (chromate, passivate) are applied. Tin plating (5–12 µm, bright or matte) to ASTM B545 is the standard finish for electrical terminal components and solderability. Electroless nickel plating (ENP, 15–25 µm) is used for wear-resistant and corrosion-resistant components. Hard chrome plating (0.5–2 µm) is applied to shafts and bearing surfaces. Silver plating (3–10 µm) is used for high-conductivity electrical contacts per IEC 60512.

Thread Forms and Tolerance Classes

C360 machined parts are threaded to ISO metric (M1.6–M72), UNC/UNF/UNEF (No. 0-80 to 3″-12 UNC), BSP/BSPT (1/16″–4″), NPT/NPTF (1/8″–4″), PG (DIN 40430), and special proprietary threads as required. Thread tolerance classes 6g/6H (ISO), 2A/2B (UN), and 3A/3B (UN) are standard; 4h/4H and tighter classes are achievable for precision applications. Thread gauging with calibrated ring and plug gauges (GO/NO-GO) per ISO 1502 or ASME B1.2/B1.3 is performed 100% or at AQL levels per customer requirements.

Special Processes and Secondary Operations

Electrical Accessories India offers a comprehensive range of secondary operations on C360 screw machine parts: internal/external knurling (DIN 82), cross-drilling (coolant and assembly holes), slot milling, flat milling (hex or square formation), counterboring, countersinking, recessing, spring pin installation, press-fitting sub-components, vibration deburring, ultrasonic cleaning, and electrolytic degreasing. Sub-assembly operations including spring loaded plungers, captive screw assemblies, and insert-loaded components are available for OEM customers requiring turnkey supply of assembled hardware.

Export and International Supply Chain

C360 brass screw machine parts and CNC machined components are exported from India to USA, UK, Germany, France, Italy, Netherlands, Australia, UAE, Saudi Arabia, Singapore, South Africa, Canada, and Brazil. HS code 7415.39 (brass screws, bolts, nuts, and similar fasteners) or 7419.80 (other articles of brass) applies. Export documentation includes commercial invoice, packing list, GSP/CO/FTA certificate of origin, EN 10204 3.1 mill certificate, dimensional inspection report, and RoHS/REACH declaration. Air freight, LCL sea freight, and FCL container options are available with target transit times of 3–5 days (air) or 20–35 days (sea) to major global destinations.

Technical Specifications

International Equivalent Grades – C360 / CDA 360 Brass

Product Types and Variants

Applications by Industry

Manufacturing Process

Raw Material: C36000 bar and rod sourced from ASTM B16 / B121 certified mills. Incoming OES chemical verification of Cu 60–63%, Pb 2.5–3.7%. Bar diameter range: 3–75 mm drawn straight bar.

Screw Machine Production: Multi-spindle automatic screw machines process C360 bar at optimized feed rates. In-process gauging with air gauge and post-process SPC data collection. First-off inspection before production release.

CNC Machining: 2-axis and Y-axis CNC turning centers for complex geometry parts. CAM from customer DXF/DWG/STEP files. Turn-mill centers for simultaneous turning and milling in one setup.

Secondary Operations: Knurling, cross-drilling, thread rolling, slot milling, broaching, deburring, and ultrasonic cleaning in-house.

Plating / Surface Treatment: Tin, nickel, chrome, silver, and zinc plating through approved sub-contractors with QA oversight and XRF thickness verification.

Final Inspection & Packing: CMM / optical comparator / gauge inspection at AQL 1.0–2.5. Bulk, strip, or tray packaging per customer specification.

Quality Standards and Certifications

Why Choose Electrical Accessories India for C360 CDA 360 Brass Parts

• Benchmark machinability alloy expertise: C360 is our primary production alloy with dedicated multi-spindle and CNC Swiss lines.
• High-volume capability: Up to 5,000,000 pieces/month; sustained Cpk ≥1.33 on critical dimensions.
• Complete thread gauging: GO/NO-GO gauges for all standard thread forms; gauge calibration records on file.
• One-stop secondary operations: Knurling, plating, sub-assembly under one roof reduces lead times.
• Competitive ex-India pricing: Cost-effective production leveraging Indian manufacturing economics.
• Export experience: USA, Europe, Middle East, Australia, SE Asia – experienced in HS code classification, INCOTERMS, and export documentation.

Frequently Asked Questions

1. What is C360 brass and why is its machinability rated 100%?

C360 (UNS C36000, CDA 360) is a copper-zinc-lead alloy containing 2.5–3.7% lead. The lead particles act as built-in chip-breakers and internal lubricants during cutting, producing short chips, reducing tool wear, and enabling the highest production rates of any copper alloy. The 100% machinability rating (CDA scale) makes it the industry benchmark against which all other alloys are compared.

2. Is C360 brass RoHS compliant?

C360 contains lead at 2.5–3.7%, which exceeds the general RoHS 0.1% limit. However, EU RoHS Directive Annex IV, Exemption 6(c) permits lead in copper alloys containing up to 4% lead for machining purposes in electrical and electronic equipment. A REACH SVHC declaration for lead content is supplied with all shipments.

3. What is the difference between C360, CDA 360, CW614N, and CZ121?

These are different national standard designations for essentially the same free-cutting brass alloy: C360/CDA 360 is the US (UNS/ASTM) designation, CW614N is the European EN designation (CuZn39Pb3), CZ121 is the UK BS designation, and C3604 is the Japanese JIS designation. Minor compositional differences exist between standards but the alloys are functionally equivalent.

4. Can C360 parts be electroplated with tin or nickel?

Yes. C360 brass accepts all standard plating systems including tin, nickel (electrolytic and electroless), silver, chrome, and zinc. Pre-treatment includes alkaline degreasing, acid activation, and strike plating. Plating thickness and adhesion are verified per ASTM B571 and ISO 2819.

5. What tolerances can be held on C360 screw machine parts?

Standard screw machine tolerances on turned OD are ±0.025 mm (IT8). CNC turned tolerances of ±0.01 mm (IT6) are achievable. Ground or honed bores can be held to ±0.005 mm (IT5). Thread tolerances of 6g/6H are standard; 4h/4H for precision applications.

6. What is the MOQ for C360 brass screw machine parts?

Standard MOQ is 50 kg per part number for production orders. Sample/prototype quantities of 10–50 pieces can be discussed for new part development. Annual blanket order agreements with monthly call-off schedules are preferred for OEM customers.

7. Can Electrical Accessories India supply C360 parts with full material traceability?

Yes. Full traceability from raw material heat number (EN 10204 3.1 mill certificate) to finished part lot is maintained. Customers can request copies of mill certificates, OES chemical analysis reports, and lot-specific inspection records for any production batch.

8. Are C360 brass parts suitable for potable water applications?

C360 contains 2.5–3.7% lead and does NOT comply with NSF/ANSI 372 (≤0.25% weighted average lead) or California AB1953 for potable water fittings. For lead-free plumbing applications, we recommend C69300 ECO Brass or C87850 alloys.

9. What secondary operations are available in-house?

In-house secondary operations include: knurling (straight, diagonal, diamond), cross-drilling and cross-tapping, slot milling, flat milling, counterboring, countersinking, thread rolling, deburring (vibratory and hand), ultrasonic cleaning, and sub-assembly. Plating and heat treatment are performed by approved sub-contractors.

10. What is the lead time for new C360 parts?

For new part designs, sample/first article lead time is 7–10 working days from drawing approval. Production lead time is 3–6 weeks depending on quantity, complexity, and surface finish. For repeat orders on tooled parts, lead time is 2–4 weeks.

Equivalent Terms in Major Languages

Related Products and Linked Terms

• C69300 ECO Brass Machined Parts (Lead-Free Alternative)
• C87850 Brass Fittings and Machined Parts
• Brass CNC Machined Parts
• Brass Screw Machine Parts
• Brass Turned Parts & Components
• CZ121 Brass Turned Parts (BS 2874 CZ121 = C360 Equivalent)
• CW614N Brass Components (EN Equivalent of C360)
• CuZn39Pb3 Brass Parts (DIN Equivalent of C360)
• Brass Hot Forged Parts
• Brass Forging Parts

Request a Quote – C360 CDA 360 Brass Screw Machine Parts

Electrical Accessories India manufactures C360 / CDA 360 free-cutting brass screw machine parts, CNC machined components, and precision hardware for global OEM, EPC, and distribution customers. Indicative pricing: US$ 11.50/kilogram (quantity and geometry dependent). Contact us with drawings or specifications for a formal quotation within 24 hours.

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