Product
Product Details
Copper Turned Components
Copper Turned Components
Pricing: US$ 16.80 / Kilogram (FOB India | MOQ: 50 Kg | Custom grades on request)
Electrical Accessories India manufactures and exports precision copper turned components produced from high-conductivity electrolytic tough pitch (ETP) copper, oxygen-free high conductivity (OFHC) copper, phosphorus-deoxidized (DHP) copper, and free-machining tellurium copper (C14500) bar stock. These copper CNC turned parts are produced on multi-axis CNC turning centres, Swiss-type sliding-headstock lathes, and multi-spindle automatic lathes conforming to customer-supplied drawings, 3D STEP models, or DXF profiles. Copper turned components serve electrical OEMs, switchgear manufacturers, transformer manufacturers, connector manufacturers, EPC contractors, power utilities, and electronics producers across North America, Europe, the Middle East, and Asia-Pacific.
Product Overview – Copper Turned Components
Copper turned components—also referenced in procurement documents as copper CNC turned parts, copper precision turned parts, copper lathe machined components, copper auto-turned parts, copper screw machine products, copper bar-turned parts, copper rotary machined components, and copper Swiss-turned parts—represent a broad category of high-conductivity copper components produced by computer-controlled material removal from copper bar, rod, or tube stock. CNC turning offers dimensional accuracies of ±0.01 mm on diameter and ±0.05 mm on length, making it the preferred process for cylindrical, conical, and profiled copper components used in electrical connectors, transformers, switchgear, and instrumentation.
Copper Contact Pins, Sockets, and Connectors
Copper contact pins, copper socket contacts, copper banana plugs, copper terminal pins, copper socket shells, copper coaxial connector bodies, copper RF connector centres, copper BNC/SMA contact bodies, copper pin contacts for multi-way connectors, copper relay pin contacts, copper current-carrying pins for PCB edge connectors, copper press-fit pins, copper spring-loaded pogo pins, copper IDC contacts, and copper crimp contacts are produced from C14500 tellurium copper or C11000 ETP copper, achieving surface finish Ra 0.4–1.6 μm as-turned and Ra 0.1–0.4 μm after centreless grinding.
Copper Bushings, Spacers, and Standoffs
Copper through-hole bushings, copper flanged bushings, copper shoulder bushings, copper threaded bushings, copper press-fit bushings, copper thermal interface spacers, copper PCB standoffs, copper pillar-type spacers, copper heat-sink standoffs, copper transformer bobbin cores, copper insulator bushings, copper coil formers, copper EMI shielding spacers, and copper cable gland body blanks are produced from ETP C11000 or DHP C12200 copper round bar in diameters from 3 mm to 150 mm, with wall thicknesses down to 0.5 mm for thin-wall drawn applications.
Copper Studs, Bolts, and Threaded Parts
Copper hex head studs, copper knurled studs, copper press-fit studs, copper weld studs, copper transformer terminal studs, copper bus-bar mounting studs, copper threaded inserts, copper captive nuts, copper lock studs, copper anchor studs, copper through-bolts, copper socket head cap screws, copper grub screws, copper set screws, copper shoulder bolts, copper shoulder screws, and copper precision hex bolts are produced on CNC lathes and CNC turning/milling centres with thread forms per DIN 13, ISO metric, UNC, UNF, BSP, and BSPT standards.
Copper Transformer and Switchgear Components
Copper transformer terminal pins, copper bushing conductors, copper through-wall bushings, copper lead-out pins, copper coil winding mandrels, copper tie rod ends, copper HV/LV terminal adapters, copper current transformer primary bars, copper potential transformer terminal blocks, copper voltage transformer plug-in contacts, copper SF6 switchgear contact rods, copper vacuum interrupter contact carriers, copper GIS (Gas-Insulated Switchgear) plug contacts, copper epoxy bushing conductors, and copper resin-cast bushing leads are produced to the dimensional requirements of transformer and switchgear OEMs.
Copper Earthing and Bonding Turned Parts
Copper earthing dowel pins, copper ground stud terminals, copper earth tag studs, copper bonding stud terminals, copper earth clamp bodies, copper equipotential bonding lugs, copper earthing anchor bolts, copper grounding rod couplings, copper earth bar studs, copper compression fitting bodies, copper cable compression lug bodies, copper test clamp stems, copper surge protector ground terminals, and copper lightning protection rod tips are produced as CNC turned components from C11000 ETP or C12200 DHP copper per BS 7430, IS 3043, IEEE 80, and IEC 62305 earthing system standards.
Copper Heat Management Turned Components
Copper heat sink pillars, copper cold plate fittings, copper thermal interface cylinders, copper cooling tube fittings, copper water-cooled busbar terminal adapters, copper heat exchange tube connectors, copper press-fit thermal vias, copper heat pipe fittings, copper thermally conductive spacers, copper TEC (thermoelectric cooler) contact bodies, copper IGBT module base connectors, and copper power electronics cooling stud assemblies take advantage of copper’s thermal conductivity of 391 W/m·K—significantly higher than aluminium (205 W/m·K) or brass (109 W/m·K).
Swiss-Type and High-Precision Micro-Turned Copper Parts
Micro-contact pins (0.8–3 mm diameter), copper hypodermic tube connectors, copper precision gauge pins, copper probe tips, copper calibration shunts, copper sensor housings, copper thermocouple connection pins, copper milliohm current shunts, copper ultra-precision resistor contacts, copper miniature relay armature pins, copper micro-switch contact studs, copper piezo sensor electrodes, copper reference electrode bodies, and copper standard resistance terminal posts are produced on Swiss-type turning centres (Star, Citizen, Tornos) achieving IT5–IT6 dimensional tolerance class and surface finish Ra 0.05–0.2 μm.
Key Features of Copper Turned Components
- Material grades: C10100, C11000, C12200, C14500 and copper alloys per specification
- Diameter range: 1 mm to 150 mm (round bar stock)
- Length range: 1 mm to 500 mm (standard); longer on request
- Dimensional tolerance: ±0.01 mm diameter (standard CNC); ±0.005 mm Swiss turning
- Surface finish: Ra 0.4–3.2 μm as-turned; Ra 0.05–0.8 μm ground/polished
- Conductivity: 95–101% IACS (grade dependent)
- Thread forms: ISO metric, UNC, UNF, BSP, BSPT, BA, NPT
- 100% visual and dimensional inspection; conductivity testing per batch
Precision CNC Turning and Swiss-Type Machining
Multi-axis CNC turning centres (up to 5-axis) with live tooling enable complex profiles including milled flats, cross-drilled holes, knurled surfaces, and undercuts to be produced in a single set-up, eliminating secondary operations. Swiss-type lathes (sliding headstock) achieve the highest precision for small-diameter parts (1–32 mm) with very tight length tolerances (±0.02 mm) and excellent surface finishes. Bar feeder automation enables unmanned production of medium to high volumes (1,000–1,000,000 pieces per year) with consistent quality.
Free-Machining Tellurium Copper for High-Output Production
C14500 tellurium copper (0.4–0.7% Te) offers machinability index of 90% (referenced to free-cutting brass = 100%), compared to 20% for ETP C11000 copper, making it the preferred grade for complex turned components requiring deep drilling, threading, cross-milling, or high-volume auto-turning production. Tellurium copper maintains ≥ 95% IACS conductivity, making it fully acceptable for electrical contact, connector, and terminal applications. It is specified per ASTM B301, BS EN 12163 CW118C, and DIN EN CuTeP standards.
Dimensional Accuracy and Surface Integrity
CNC turned copper components achieve diameter tolerances of h6–h8 (ISO 286-1) for bearing and press-fit applications, and g6–g7 for clearance and slip-fit applications. Thread accuracy conforms to ISO 6g (external) and 6H (internal) tolerance classes. Surface finish Ra 0.4–1.6 μm is standard for contact and mating surfaces; Ra 0.1–0.4 μm is achievable by roller burnishing or centreless grinding of the turned diameter. Flatness of end-faces is held to 0.02 mm per 25 mm diameter for precision mating components.
Plating and Surface Treatment Options
Post-turning surface treatments include: tin plating (ASTM B545, 3–8 μm matte or bright); nickel plating (ASTM B689, 3–10 μm electroless or electrolytic); silver plating (ASTM B700, 5–25 μm for high-current electrical contacts); gold flash (0.05–0.2 μm over nickel for corrosion resistance); palladium-nickel (for connector contacts); zinc plating + chromate (for hardware); and chemical passivation for tarnish resistance. All plating is performed in-house with XRF thickness verification per ASTM B568 and adhesion testing per ASTM B571.
Material Traceability and Quality Documentation
Copper bar and rod stock is sourced from LMBA-registered smelters with EN 10204 Type 3.1 mill certificates. Heat number traceability links finished parts to raw material lots. Incoming material is 100% tested for chemical composition (ICP spectroscopy), conductivity (eddy-current), and hardness (Vickers/Rockwell) before release to production. First-article inspection (FAI) reports with dimensional data, surface finish measurements, and conductivity test results are provided for OEM qualification. PPAP Level 3 documentation is available on request.
Volume Flexibility and Lead Times
Prototype quantities from 25 pieces can be produced in 5–7 working days from approved drawings. Standard production quantities (500–50,000 pieces) are fulfilled in 2–4 weeks. High-volume blanket orders (50,000–5 million pieces/year) are supported through bar feeder automation, multi-spindle turning, and VMI (Vendor-Managed Inventory) programs with weekly or monthly call-off schedules. Emergency deliveries within 48–72 hours are available from pre-machined semi-finished stock for critical customer requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product | Copper Turned Components / Copper CNC Turned Parts |
| Process | CNC Turning, Swiss-Type Turning, Multi-Spindle Turning, Turn-Mill |
| Material Grades | C10100, C11000, C12200, C14500 (see grade table) |
| Bar Stock Diameter | 1 mm to 150 mm |
| Part Length Range | 1 mm to 500 mm |
| Diameter Tolerance | ±0.01 mm CNC turning; ±0.005 mm Swiss turning |
| Length Tolerance | ±0.05 mm standard; ±0.02 mm precision |
| Surface Finish | Ra 0.4–3.2 μm (as-turned); Ra 0.05–0.8 μm (ground/polished) |
| Thread Forms | ISO metric (DIN 13), UNC, UNF, BSP (ISO 228), BSPT (ISO 7), BA, NPT |
| Conductivity | 95–101% IACS (grade dependent) |
| Tensile Strength | 200–400 MPa (temper and grade dependent) |
| Hardness | 40 HRF (annealed) to 95 HRB (work-hardened) |
| Surface Treatment | Bright / Tin-plated / Nickel-plated / Silver-plated / Gold flash |
| MOQ | 50 kg (standard); 25 pcs (prototype) |
| Lead Time | Prototype: 5–7 days; Production: 2–4 weeks |
Copper Raw Material Grades and International Equivalents
| UNS (USA) | EN (Europe) | BS (UK) | DIN (Germany) | IS (India) | JIS (Japan) | Description |
|---|---|---|---|---|---|---|
| C10100 | CW008A | C101 | E-Cu99.99 | — | C1011 | OFHC – Oxygen-Free High Conductivity |
| C11000 | CW004A | C101 | E-Cu58 (ETP) | ETP Copper | C1100 | Electrolytic Tough Pitch (ETP) |
| C12200 | CW024A | C106 | SF-Cu (DHP) | DHP Copper | C1220 | Phosphorus Deoxidized High Residual |
| C14500 | CW118C | C109 | CuTeP | — | C1450 | Tellurium Copper – Free Machining |
| C15000 | CW120C | — | CuZr | — | C1500 | Zirconium Copper – High Strength |
Product Types and Variants
| Component Type | Typical Dimensions | Primary Application |
|---|---|---|
| Contact Pins and Sockets | Ø 1–20 mm × 5–100 mm | Electrical connectors, relay bases, PCB terminals |
| Bushings (plain/flanged) | Ø 5–150 mm × 5–200 mm | Transformer insulation, switchgear housings, cable glands |
| Studs and Threaded Parts | M3–M36, L 10–300 mm | Transformer terminals, busbar joints, earthing systems |
| Spacers and Standoffs | Ø 3–50 mm × 2–100 mm | PCB assemblies, EMI shielding, power electronics |
| Knurled/Serrated Parts | Ø 4–30 mm × 5–80 mm | Press-fit inserts, panel-mount terminals, grip contacts |
| Deep-Drilled Hollow Parts | Ø 5–80 mm, L/D up to 10:1 | Cable connector bodies, hollow terminal bushings |
| Micro-Turned Parts | Ø 0.5–3 mm × 1–30 mm | Sensor probes, micro-connectors, instrument contacts |
| Complex Turn-Milled Parts | Any profile up to Ø 100 mm | Custom OEM electrical components with combined features |
Applications by Industry
| Industry | Copper Turned Component Application |
|---|---|
| Power Transmission and Distribution | Transformer terminal pins, bushing conductors, current transformer bars, switchgear contacts |
| Switchgear and Control Gear | Vacuum interrupter contacts, GIS plug contacts, relay pins, contactor studs, circuit breaker terminals |
| Connectors and Wiring | Multi-pin connector contacts, banana plugs, socket contacts, crimp terminal bodies, coaxial contacts |
| Earthing and Grounding | Earthing dowel pins, grounding studs, bonding terminal bodies, earth bar components |
| Renewable Energy | Inverter terminal pins, battery connector contacts, solar junction box terminals, wind turbine slip-ring contacts |
| Railways and Metro | Pantograph carbon contact holders, OHE clamp studs, traction motor terminal pins, current collector inserts |
| Electronics and PCB Assembly | PCB standoffs, press-fit pins, through-board connectors, heat sink pillars, EMI shielding pillars |
| Oil, Gas, and Petrochemical | Explosion-proof terminal bodies, ATEX connector pins, hazardous area earthing studs, instrument terminal blocks |
Manufacturing Process
Copper turned components are produced through a rigorous multi-step process: Step 1 – Raw Material Inspection: Copper bar and rod is tested for chemical composition (ICP spectrometry), conductivity (eddy-current), hardness, and dimensional straightness before acceptance. Material is allocated to production lots with heat number traceability. Step 2 – CNC Programming: Customer drawings are converted to CNC programs (ISO G-code) using CAM software. Toolpath simulation verifies dimensional accuracy and cycle time before production. Step 3 – Turning Operations: Parts are turned on multi-axis CNC lathes or Swiss-type turning centres. Bar feeders provide continuous stock feeding. In-process gauging with digital micrometers and air gauges verifies critical dimensions. Step 4 – Secondary Operations: Milling, drilling, threading, knurling, and slotting are performed in turn-mill centres or secondary operations as required. Step 5 – Deburring and Cleaning: Parts are deburred by vibratory finishing, barrel tumbling, or hand deburring. Ultrasonic cleaning removes cutting oil residues. Step 6 – Plating/Surface Treatment: Applied per customer specification in in-house barrel or rack plating lines. Step 7 – Final Inspection: 100% visual inspection; sampling dimensional check per AQL 1.0 on CMM or optical projector; conductivity testing on 10% of pieces. Step 8 – Packing and Documentation: VCI-treated polybag, compartmented tray, or bulk container with EN 10204 3.1 MTC, REACH/RoHS declaration, and packing list.
Quality Standards and Certifications
| Standard / Certification | Scope |
|---|---|
| ISO 9001:2015 | Quality Management System |
| ASTM B301 / BS EN 12163 | Tellurium copper rod chemical composition |
| ASTM B187 / BS EN 13601 | ETP/DHP copper rod and bar properties |
| EN 10204 Type 3.1 | Material test certificate with independent inspection |
| DIN ISO 286-1 | Limits and fits for turned diameters |
| ISO 965-1 | Thread tolerance class 6g/6H |
| RoHS 2 (2011/65/EU) | Restriction of hazardous substances in plating |
| REACH (EC 1907/2006) | Chemical substance compliance |
| ASTM B568 | XRF plating thickness verification |
Why Choose Electrical Accessories India for Copper Turned Components?
Electrical Accessories India operates a dedicated copper precision machining division equipped with multi-axis CNC turning centres, Swiss-type lathes (Citizen, Star, Tornos equivalent), multi-spindle automatic lathes, bar feeder automation, and in-house electroplating. Our capabilities include: single-source supply for copper turned parts, stampings, fasteners, and connectors; EN 10204 3.1 material certificates with every shipment; NABL-traceable CMM dimensional reports; first-article inspection with full dimensional report; export packaging per ISPM-15; and competitive pricing at US$ 16.80/kg FOB India. We supply clients in India, USA, UK, Germany, UAE, Australia, Canada, Singapore, and South Africa.
Frequently Asked Questions (FAQ)
Q1. What is the minimum order quantity for copper turned components?
MOQ is 50 kg for standard turned parts. For prototype and R&D quantities, 25 pieces minimum is accepted. For Swiss-turned micro-components below 3 mm diameter, MOQ is 500 pieces due to setup economics. Blanket orders with monthly call-offs are available for OEM customers with regular requirements.
Q2. Which copper grade is best for contact pins and socket components?
C14500 tellurium copper is the standard for high-volume contact pin turning due to its 90% machinability index, superior chip breaking, and excellent surface finish. C11000 ETP copper is used where maximum conductivity (≥ 98% IACS) is needed and machining volumes are moderate. C10100 OFHC is specified for ultra-low oxygen applications such as vacuum interrupter contacts and precision instrument terminals.
Q3. What thread forms can you produce in copper turned parts?
We produce all standard thread forms: ISO metric (M1 to M36), Unified (UNC, UNF, UNEF), British Standard Pipe (BSP/BSPT per ISO 228/ISO 7), British Association (BA), American National Pipe Thread (NPT/NPTF), and trapezoidal/ACME. Left-hand threads, multi-start threads, and special thread profiles are available against drawings. Thread gauging is performed with calibrated GO/NO-GO ring and plug gauges.
Q4. What plating options are available for copper turned contact pins?
Standard options include: silver plating (5–25 μm, ASTM B700) for high-current contacts; tin plating (3–8 μm, ASTM B545) for PCB terminals and solderability; nickel plating (3–10 μm, ASTM B689) for corrosion and wear resistance; gold flash (0.05–0.5 μm over nickel) for low-resistance connectors; and palladium-nickel for connector contact applications. All platings are RoHS 2 compliant (lead-free).
Q5. What dimensional tolerances can you achieve on copper turned parts?
Standard CNC turning achieves diameter tolerance of ±0.01 mm (IT7–IT8). Precision turning with in-process gauging achieves ±0.005 mm (IT6). Swiss-type turning achieves ±0.003 mm (IT5) on diameters up to 32 mm. Grinding after turning achieves ±0.001 mm (IT4–IT5) for critical bearing/press-fit applications. Surface finish Ra 0.05–0.2 μm is achievable by centreless grinding or roller burnishing.
Q6. Do you supply EN 10204 3.1 material test certificates?
Yes. EN 10204 Type 3.1 certificates from the copper rod manufacturer are provided with every production shipment, including chemical composition, mechanical properties, hardness, and conductivity. Third-party witnessed inspection (SGS, Bureau Veritas, TÜV) is available at additional cost for critical OEM qualification requirements.
Q7. Can you machine copper parts to ATEX/IECEx explosive atmosphere standards?
Yes. Copper turned components for ATEX Zone 1/2 and IECEx applications are produced with documented material certificates confirming copper alloy compliance (no ferrous contamination), and are manufactured in a clean environment to avoid steel particle contamination. ATEX certification for the complete assembly is the responsibility of the end-equipment manufacturer; we supply certified copper parts with full material documentation.
Q8. What is your typical lead time for new copper turned components?
Prototype quantities (25–100 pieces): 5–7 working days. Standard production orders (500–10,000 pieces): 2–3 weeks. Large volume orders (10,000+ pieces): 3–5 weeks. Swiss-turned micro-components have similar lead times but require 1–2 weeks for programming and first-article approval. Repeat orders for established parts can be fulfilled in 1–2 weeks from confirmed purchase order.
Q9. Are copper turned parts available in custom alloys such as beryllium copper or chromium copper?
Yes. Beryllium copper (C17200/C17300 – UNS/CW101C – EN) spring-loaded contacts, chromium zirconium copper (C18150 – CW120C) for resistance welding electrodes, and silver-bearing copper (C11600) for elevated-temperature applications are available. Minimum order quantities for non-standard alloys are 100 kg. Material lead time for special alloys may be 4–8 weeks depending on mill availability.
Q10. Do you offer sub-assembly and packaging services for copper turned parts?
Yes. Value-added services include press-fit assembly (inserting copper pins into plastic housings), riveting, staking, soldering, welding (spot, TIG), and customer-specific packaging (tape-and-reel, compartmented trays, blister packs, ESD bags). Bar coding, laser marking, and 2D matrix marking for part traceability are available. Kanban supply with EDI-linked inventory management is offered for OEM customers with stable monthly demand.
Equivalent Terms in Other Languages
| Language | Equivalent Terms (3–4 terms) |
|---|---|
| Spanish | Componentes torneados de cobre, Piezas torneadas de cobre, Piezas mecanizadas de cobre CNC |
| Russian | Медные точёные компоненты, Медные детали токарной обработки, Медные прецизионные точёные детали |
| French | Composants tournés en cuivre, Pièces décolletées en cuivre, Pièces usinées CNC en cuivre |
| Portuguese | Componentes torneados de cobre, Peças usinadas de cobre, Peças torneadas CNC de cobre |
| Italian | Componenti torniti in rame, Parti tornite in rame, Pezzi lavorati al tornio in rame |
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Request a Quote – Copper Turned Components
Electrical Accessories India | Manufacturer & Exporter of Copper Turned Components
Email: info@elecaccs.com | Website: elecaccs.com
Price: US$ 16.80 / Kilogram (FOB India)
Lead Time: 2–4 weeks | MOQ: 50 Kg | Prototype: 25 pcs
Submit your drawing or specification (PDF, DXF, STEP) to receive a detailed technical and commercial quotation within 24 business hours. We serve electrical OEMs, connector manufacturers, EPC contractors, and distributors across India, USA, UK, Germany, UAE, Australia, Canada, Singapore, and South Africa.
