Copper Electrical Pressed Parts – NEC & UL-Compatible, ASTM Certified | Trusted by US Electrical & Electronics OEMs
US electrical engineers, switchgear manufacturers, PCB OEMs, and EV/automotive suppliers specify copper electrical pressed parts for one reason: no other metal combines 100% IACS electrical conductivity with the formability, solderability, and corrosion resistance that copper delivers. Conex Screws and Fasteners has been manufacturing and exporting Copper Electrical Pressed Parts to US buyers for over 30 years — supplying contact blades, bus bar tabs, earth terminals, fuse clips, grounding straps, and custom copper stampings from ASTM B152-certified Cu-ETP and OFHC copper stock.
We understand what the US electrical industry demands: UL/NEMA-compatible material grades, NEC-compliant current-carrying capacity considerations, solderability to J-STD-002 standards for electronics customers, and RoHS compliance for California and EU-bound assemblies. Our copper electrical pressed parts are manufactured, documented, and packed to meet the incoming inspection standards of demanding US OEM customers.
Why US Electrical Industry Buyers Choose Conex
- ASTM B152 Certified Cu-ETP (C11000): 100% IACS — the benchmark for electrical conductivity, certified and documented. No substituted alloys, no surprises.
- UL/NEMA-Compatible Material: Cu-ETP C11000 is the standard copper alloy recognized in UL standards for bus bars, connectors, and electrical hardware.
- RoHS & California Prop 65 Compliant: Lead-free copper grades with full RoHS declarations and Prop 65 compliance documentation available.
- India-Origin Tariff Advantage: Copper stampings from India avoid Section 301 tariffs — significantly lower total landed cost vs. Chinese-origin equivalents.
- Solderability Testing: J-STD-002 wetting balance and dip-and-look testing available for tin-plated copper parts destined for PCB/electronic assembly.
- IPC-Compatible Plating: Electrotin (E-Sn), electronickel (E-Ni), electrosilver (E-Ag), and electrogold (E-Au) plating to IPC-4552, IPC-4553, or MIL-P-81728 specifications.
What Are Copper Electrical Pressed Parts?
Copper electrical pressed parts are current-carrying components fabricated by stamping, pressing, or forming copper sheet, strip, or foil into precise shapes for electrical and electronic applications. In US electrical engineering terminology, these include copper bus bar components (UL 891 / ANSI C37.20 switchgear assemblies), copper contact blades (UL 489 MCBs and circuit breakers), copper earth/grounding terminals (NEC Article 250 compliant grounding hardware), copper fuse clips (UL 248 fuse holders), and a wide range of custom copper stampings for commercial, industrial, and defense electrical systems. The US electrical code ecosystem — NEC, NEMA, UL, IEEE — relies on copper as the primary conductor material, and Conex is the overseas manufacturer that US electrical OEMs trust for their copper stamped sub-components.
Key Engineering Features for US Electrical Applications
- 100% IACS Conductivity (Cu-ETP C11000): The reference standard for all electrical conductivity calculations in NEC ampacity tables and UL component ratings.
- High Thermal Conductivity (385 W/m·K / 222 BTU/hr·ft·°F): Critical for UL 489/508A thermal-magnetic circuit breaker contact blades and bus bar heat dissipation in NEMA enclosures.
- Excellent Solderability: Cu-ETP wets readily with solder (J-STD-002 Grade A) — essential for PCB-mounted copper hardware in IPC Class 2 and Class 3 assemblies.
- Low Contact Resistance: Precision-pressed copper contacts maintain stable low resistance over millions of cycles — critical for UL 489 circuit breaker performance requirements.
- RoHS / REACH Compliant: Lead-free copper with full compliance documentation for US electronics customers facing California SB-54 and federal RoHS enforcement.
- Custom Plating for US Standards: Tin plating per IPC-4552, silver plating per MIL-P-81728, nickel per ASTM B689 — matched to your US standard.
Typical Copper Electrical Pressed Parts for US Industries
- Copper bus bar tabs and transition plates (UL 891 / ANSI switchgear)
- Copper contact blades and rocker contacts (UL 489 MCBs / circuit breakers)
- Copper earth grounding terminals and lugs (NEC Article 250)
- Copper shorting links and bus connectors (IEC / UL panelboard assemblies)
- Copper fuse clips (UL 248 Class J, R, CC fuse holders)
- Copper EMI shielding clips and finger stocks (MIL-STD-461 shielded enclosures)
- Copper PCB spring contacts and retention pins (IPC Class 2/3 assemblies)
- Copper heat sinks and thermal spreaders (power electronics — TO-220, TO-247 packages)
- Copper EV battery interconnects and cell terminal straps (SAE J1888 / UL 2580)
- Custom copper stampings per US customer drawings, CAD files, or samples
ASTM Material Grades & US Electrical Standards Cross-Reference
| ASTM Grade (USA) | Common US Name | Conductivity (% IACS) | British (BS) | DIN | Primary US Application |
|---|---|---|---|---|---|
| ASTM B152 C11000 | ETP Copper (Cu-ETP) | 100% | BS 1172 C101 | Cu-ETP | Bus bars, contacts, grounding hardware, general electrical |
| ASTM B152 C10200 | OF Copper (Cu-OF) | 101% | BS 1172 C103 | Cu-OF | RF connectors, weld-grade, hermetic seals |
| ASTM B152 C12200 | DHP Copper (Cu-DHP) | 85% | BS 2870 C106 | Cu-DHP | Brazing, HVAC fittings, plumbing |
| ASTM B152 C10100 | OFHC Copper | 101%+ | BS 1172 C103 | Cu-OFE | Vacuum electronics, cryogenic, semiconductor equipment |
US Plating Standards We Comply With
| Plating Type | US Standard | Thickness | Application |
|---|---|---|---|
| Electrotin (E-Sn) | IPC-4552 / ASTM B545 | 100–400 μin (2.5–10 μm) | Solderability, oxidation prevention for electronics |
| Electrosilver (E-Ag) | MIL-P-81728 / ASTM B700 | 50–200 μin (1.3–5 μm) | High-current bus bar contacts, RF connectors |
| Electronickel (E-Ni) | ASTM B689 / MIL-C-26074 | 100–500 μin (2.5–12.5 μm) | Corrosion barrier, wear resistance |
| Electrogold (E-Au) | ASTM B488 / MIL-G-45204 | 10–50 μin (0.25–1.25 μm) | PCB contact pins, switch contacts, aerospace connectors |
Performance Metrics (ASTM C11000 Cu-ETP)
- Electrical Conductivity: 100% IACS (min 97% per ASTM B152)
- Thermal Conductivity: 222 BTU/hr·ft·°F (385 W/m·K)
- Tensile Strength: 29,000–43,000 psi (annealed to hard temper)
- Hardness: 40–100 HV (Vickers) / 30–85 HRF (Rockwell F)
- Stamping Tolerance: ±0.001″–0.002″ (standard); ±0.0005″ (precision)
- Operating Temperature: Continuous service up to 300°F (150°C)
- Resistivity: 1.724 μΩ·cm (annealed, IACS standard)
Our Technical Expertise — 30 Years Supplying US Electrical & Electronics OEMs
Three decades of supplying copper pressed parts to the US market means Conex speaks the language of American electrical engineering. We know the difference between UL 489 and UL 508A requirements, understand why NEMA 4X enclosure bus bars need C11000 ETP copper, and why your electronics customer’s PCB connector pins need J-STD-002 Grade A solderability certification. Our quality systems are aligned to produce copper stampings that pass US OEM incoming inspection on the first attempt — every time. We maintain dedicated copper production lines, segregated from brass to prevent cross-contamination, with conductivity verification on every lot.
Related US Search Terms
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US-Compliant Export Packaging & Documentation
Copper electrical pressed parts are packed in antistatic polybags with desiccant to prevent oxidation tarnish. Tin-plated parts are individually sleeved to prevent scratching. Each package is labeled with ASTM grade (e.g., C11000-ETP), plating specification (e.g., E-Sn per IPC-4552, 150 μin), quantity, lot number, and part reference. Cartons are ISPM-15 compliant. Documentation: ASTM B152 MTC, plating certificate (thickness and adhesion tested), RoHS declaration, COO, commercial invoice in USD, and COC signed by QC manager.
Why US Buyers Choose Conex Over Domestic or Chinese Copper Stamping Suppliers
- ASTM Conductivity Verified: Every lot is conductivity-tested. We don’t just label C11000 — we verify it.
- IPC/MIL Plating Standards Met: Our plating partners work to IPC-4552, ASTM B545, MIL-P-81728, and other US-recognized specifications.
- India-Origin Tariff Savings: Section 301 tariffs do not apply to Indian copper stampings — US buyers save significantly vs. sourcing from China.
- Solderability Guaranteed: Tin-plated copper parts tested to J-STD-002 before shipment. No solderability failures on your SMT line.
- EV & Automotive Ready: PPAP documentation, AIAG process controls, and APQP-aligned quality planning available for EV OEM supply chain requirements.
- Responsive, English-Speaking Team: Same-day email responses, USD quotations, and US freight forwarder coordination by our experienced export team.
What Separates Conex from Other Copper Electrical Parts Manufacturers
Most overseas copper stamping suppliers can produce a flat copper blank. What they can’t do is provide verified ASTM B152 conductivity data, meet IPC-4552 tin plating specifications, deliver J-STD-002 solderability test results, and coordinate a smooth US Customs entry — all with a responsive, technically literate sales team. Conex has built these capabilities over 30 years of serving US electrical OEMs, and we bring all of it to every copper electrical pressed part we manufacture for US customers. We are the overseas supplier that your electrical engineering team and your QC manager can both rely on.
US Industry Applications
- Switchgear & Panelboard Manufacturers (NEMA / UL 891 / UL 508A assemblies)
- MCB & Circuit Breaker OEMs (UL 489 certified products)
- PCB & Electronics Assembly (IPC Class 2/3, SMT and through-hole)
- EV & Hybrid Vehicle OEMs (SAE J1888 / UL 2580 battery interconnects)
- Power Electronics & Inverter Manufacturers (heat sinks, bus bars)
- RF & Microwave Equipment (OFHC copper C10200 for connectors and waveguides)
- Aerospace & Defense Electrical Systems (MIL-DTL-55302 connector components)
Frequently Asked Questions – US Buyers
Q1. Is your copper certified to ASTM B152 for US electrical applications?
Yes. We use ASTM B152 certified Cu-ETP (C11000) strip from certified mills. MTCs confirming chemistry (99.9% Cu min), conductivity (100% IACS), and mechanical properties are provided with every shipment.
Q2. Can copper pressed parts from India be used in UL-listed electrical assemblies?
Yes, as long as the copper material meets the conductivity and purity requirements specified in the relevant UL standard (e.g., UL 489, UL 508A). Our ASTM B152 MTCs document that our copper meets these material requirements. UL listing of the final assembly is the responsibility of the US OEM.
Q3. Do you supply tin-plated copper parts to IPC-4552 specifications?
Yes. We apply electrotin plating to IPC-4552 or ASTM B545 specifications with thickness controlled to your requirement (e.g., 100–400 μin). Plating certificates and solderability test results are provided.
Q4. Are copper stampings from India subject to Section 232 or 301 tariffs?
Indian-origin copper stampings under HTS Chapter 74 are generally imported at standard MFN duty rates and are not subject to Section 301 tariffs (which apply to Chinese goods). Section 232 tariffs (steel/aluminum) do not apply to copper products. We provide COO documentation for US Customs entry.
Q5. Can you produce copper EV battery interconnects and cell straps?
Yes. Copper cell-to-cell interconnects, bus bar straps, and flexible laminated copper links for EV/HEV battery packs are available. We support PPAP documentation for automotive and EV supply chains.
Q6. Can you supply silver-plated copper bus bar components?
Yes. Silver plating to MIL-P-81728 or ASTM B700 is available for high-current bus bar contacts and switchgear applications. Plating thickness per your specification.
Q7. Do you offer solderability testing per J-STD-002?
Yes. Tin-plated copper parts can be tested by J-STD-002 (wetting balance or dip-and-look) before shipment. Test reports are provided for IPC Class 3 customers.
Q8. What is the lead time for copper electrical pressed parts to the USA?
Standard copper stampings: 7–14 days production + 18–25 days sea freight to US West Coast, or 5–7 business days air freight. Total: 4–6 weeks sea, 2–3 weeks air.
Q9. Can you produce OFHC copper stampings for RF and microwave applications?
Yes. OFHC copper (ASTM B152 C10100/C10200) stampings for RF connectors, waveguide flanges, and microwave cavity components are available with full material documentation.
Q10. Do you provide PPAP documentation for EV and automotive customers?
Yes. PPAP Level 1–3 including PSW, dimensional layout, MTC, process capability (Cpk), and control plan are available for automotive and EV OEM supply chain customers.
Q11. What is the MOQ for copper electrical pressed parts?
MOQ is 1,000 pieces for standard items and 5,000 pieces for custom tooled parts. We support prototype quantities with tooling charges.
Q12. Can you stamp copper foil for flexible circuit or heat spreader applications?
Yes. We stamp copper foil from 0.004″ (0.1 mm) thick for flexible circuit hardware and ultra-thin thermal interface components.
Q13. Do you sign NDAs for proprietary US customer designs?
Yes. We execute NDAs before receiving customer drawings. Your intellectual property is protected throughout our manufacturing process.
Q14. What certifications support your quality system?
Our quality system is ISO-aligned with documented control plans, inspection procedures, and ANSI/ASQ Z1.4 sampling. We are in the process of formal ISO 9001 certification. Third-party audits are welcomed.
Q15. How do I submit a copper electrical parts inquiry?
Send your drawing (PDF, DXF, STEP), ASTM grade (C11000/C10200/C12200), plating spec, quantity, and US delivery port. We respond with a detailed USD quotation within 24 hours.
Customer Testimonials
“Conex has been our supplier for tin-plated copper contact blades for our UL 489-listed circuit breakers for eight years. Their ASTM B152 MTCs are always complete, the IPC-4552 tin plating passes our solderability tests first time, and they’ve never missed a shipment deadline. Completely reliable partner from India.”
— Klaus Weber, Electrical Engineering Procurement, Switchgear OEM, Illinois, USA
“We qualified Conex as a second source for our copper bus bar components after our domestic supplier raised prices significantly. Their ETP copper quality is equivalent, their PPAP Level 2 documentation was thorough, and the total landed cost including freight was 28% below our domestic cost. They’re now our primary source.”
— Andrew Collins, VP Supply Chain, Power Electronics OEM, Michigan, USA
Glossary of US Electrical Standards & Terms
- ASTM B152
- American standard for copper sheet, strip, plate, and rolled bar — C11000 (ETP), C10200 (OF), C12200 (DHP), and C10100 (OFHC) grades.
- NEC (National Electrical Code)
- NFPA 70 — the US standard for safe electrical installation, governing conductor sizing, grounding hardware, and connection requirements.
- UL 489
- UL standard for molded-case circuit breakers — covers copper contact blade material and performance requirements.
- IPC-4552
- IPC specification for electrodeposited tin finishes on printed circuit board (PCB) components — used to ensure solderability.
- J-STD-002
- Joint Industry Standard for solderability test methodology — required by IPC Class 2 and Class 3 electronics manufacturers to verify tin-plated parts will form reliable solder joints.
- IACS
- International Annealed Copper Standard — the reference for electrical conductivity measurement. Pure annealed copper (Cu-ETP C11000) is defined as 100% IACS (58 MS/m).
- MIL-P-81728
- US military specification for silver electroplating — used for copper bus bar contacts and RF connectors in defense electrical systems.
- PPAP
- Production Part Approval Process (AIAG standard) — required documentation for new parts entering automotive and EV supply chains in the USA.
Related Parts: Copper bus bar stampings ASTM C11000, copper contact blades UL 489, copper grounding terminals NEC, copper fuse clips UL 248, copper EMI clips MIL-STD-461, copper EV interconnects SAE, copper PCB pins IPC, tin-plated copper parts IPC-4552, silver-plated copper bus bar, OFHC copper stampings C10200, copper heat sinks power electronics, copper electrical hardware OEM USA
Ready to Source? Start Your US Inquiry Today!
US electrical OEMs, switchgear manufacturers, PCB assemblers, and EV battery makers — Conex Screws and Fasteners delivers ASTM B152-certified copper electrical pressed parts with the documentation, plating specifications, and supply chain reliability your US production line demands.
📧 Send your drawing and plating spec today. Detailed USD quote in 24 hours.
✅ ASTM B152 certified Cu-ETP | ✅ IPC/MIL plating specs | ✅ India-origin (no Section 301) | ✅ PPAP / FAI available | ✅ J-STD-002 solderability testing
