Bronze Stamped Parts – ASTM Certified Precision Bronze Stampings for US OEMs, Defense, and Industrial Buyers
US manufacturers and procurement professionals across defense, aerospace, electronics, hydraulics, and industrial OEM sectors rely on precision Bronze Stamped Parts that meet ASTM material standards, hold tight dimensional tolerances, and arrive with complete documentation. Conex Screws and Fasteners has been manufacturing and exporting precision bronze stampings to the United States for over 30 years — understanding the quality language of American engineering: ASTM grades, ANSI/ASME tolerances, AS9100 process discipline, and the paperwork trail that US QC teams demand.
Whether you need phosphor bronze contact springs for Silicon Valley electronics, aluminum bronze wear pads for Midwest industrial machinery, or tin bronze thrust washers for Gulf Coast oil & gas equipment — Conex delivers engineered bronze stampings from ASTM-certified stock with documentation that sails through your receiving inspection.
Why US Buyers Choose Conex for Bronze Stampings
- ASTM Material Certification: C51000, C52100, C61300, C65500, C90700 — all from ASTM-certified strip with genuine MTCs, not unverifiable “certificates.”
- In-House Tooling = Your IP Protection: We design and own the tooling for your parts. No third-party toolmaker has access to your drawings or designs.
- India-Origin Tariff Advantage: Bronze stampings from India typically avoid Section 301 tariffs that apply to Chinese-origin goods — significant cost savings on high-volume orders.
- FAI / PPAP Documentation: First Article Inspection reports, PPAP Level 1–3 dossiers, COC, dimensional layout — all available for automotive, defense, and aerospace US customers.
- Third-Party Pre-Shipment Inspection: SGS, Bureau Veritas, Intertek inspection at our facility before shipment — no surprises at your US receiving dock.
- Blanket Orders & Scheduled Releases: Lock in pricing and have stock released monthly or quarterly — ideal for US JIT manufacturing environments.
What Are Bronze Stamped Parts?
Bronze stamped parts are components manufactured by pressing or stamping bronze strip, sheet, or coil through precision hardened steel tooling. Operations include blanking, piercing, bending, forming, deep drawing, coining, and progressive die processing. Bronze stamping is preferred in US industries for components that combine structural strength, non-magnetic properties, corrosion resistance, and electrical conductivity — properties that steel or aluminum stampings cannot simultaneously deliver. US engineers specify bronze stampings when the application demands performance in harsh, conductive, or corrosion-prone environments.
Key Engineering Advantages for US Applications
- Non-Magnetic: Critical for avionics, medical devices (MRI-safe), and precision instruments near sensitive sensors.
- Non-Sparking: Bronze is preferred for safety-critical tools and components in explosive/flammable environments per OSHA and ATEX-equivalent US standards.
- Excellent Spring Fatigue Life: Phosphor bronze stampings sustain millions of cycles — specified by US electronics OEMs for spring contacts and retention clips.
- High Corrosion Resistance: Aluminum bronze and silicon bronze stampings withstand seawater, salt spray (ASTM B117 test environments), and industrial chemicals.
- Good Electrical Conductivity: Phosphor bronze (15–20% IACS) for electrical contacts; tin bronze for current-carrying hardware per NEC and NEMA standards.
- Thermal Stability: Bronze stampings maintain dimensional stability across the temperature ranges common in US industrial environments.
Bronze Stampings We Manufacture for US Industries
- Phosphor bronze contact springs and retention clips (electronics / PCB hardware)
- Bronze EMI/RFI shielding clips and finger stocks (telecommunications / defense)
- Bronze electrical terminals and connector shields (industrial / commercial wiring)
- Aluminum bronze wear plates and thrust pads (oil & gas / heavy equipment)
- Bronze retaining rings and snap rings (hydraulic / pneumatic assemblies)
- Bronze grounding clips and earth straps (NEC-compliant electrical installations)
- Bronze medical device components (non-magnetic, biocompatible alloys)
- Bronze aerospace hardware (non-magnetic, non-sparking, per engineering drawings)
- Custom bronze stampings per US customer drawings, samples, or CAD files
ASTM Material Grades & US Cross-Reference
| ASTM Grade (USA) | Common US Name | Temper | Tensile (psi) | Key US Application |
|---|---|---|---|---|
| ASTM B139 C51000 | Phos. Bronze Grade A | O to H08 | 55,000–100,000 | Contact springs, snap clips, EMI shields |
| ASTM B103 C52100 | Phos. Bronze Grade C | O to H08 | 68,000–116,000 | High-strength springs, connector housings |
| ASTM B505 C90700 | Tin Bronze (90-10) | As-pressed | 45,000–60,000 | Bushings, thrust pads, bearing liners |
| ASTM B169 C61300 | Aluminum Bronze | O, H02 | 75,000–95,000 | Marine wear parts, offshore hardware |
| ASTM B99 C65500 | Silicon Bronze | O, H02 | 55,000–100,000 | Marine hardware, weldable structural parts |
Stamping Capability Chart (Imperial & Metric)
| Parameter | Standard Range (in / mm) | Precision Range (in / mm) |
|---|---|---|
| Strip Thickness | 0.008″–0.250″ / 0.2–6.0 mm | 0.004″–0.197″ / 0.1–5.0 mm |
| Part Length / OD | Up to 10″ / 250 mm | Up to 8″ / 200 mm |
| Hole Diameter (min) | 0.040″ / 1.0 mm | 0.020″ / 0.5 mm |
| Bend Radius (min) | 0.5× material thickness | 0.3× material thickness |
| Dimensional Tolerance | ±0.002″ / ±0.05 mm | ±0.001″ / ±0.02 mm |
| Press Capacity | 5–200 ton mechanical / hydraulic | 10–100 ton precision |
Performance Metrics
- Tensile Strength Range: 45,000–116,000 psi depending on alloy and temper
- Hardness Range: 60–250 HV / 60–110 HRB
- Stamping Tolerance: ±0.001″–±0.002″ (precision); ±0.002″–±0.005″ (standard)
- Salt Spray Resistance: 200–500+ hours (ASTM B117) for aluminum and silicon bronze
- Temperature Range: -325°F to +300°F standard alloys; higher for specialty bronze
- Surface Finish: As-stamped Ra 32–63 μin; electropolished, tin-plated, nickel-plated, silver-plated options
Our Technical Expertise — 30 Years Stamping Bronze for US OEMs
Since the early 1990s, Conex has been the trusted overseas stamping partner for US OEMs who need bronze parts done right. Our team understands ASTM alloy designations and ASME tolerance conventions. Our QC system is aligned to ANSI/ASQ Z1.4 sampling plans. For automotive customers, we provide PPAP documentation. For aerospace customers, we maintain process records consistent with AS9100 discipline. And for defense-adjacent customers who ask about DFARS compliance, we provide full country-of-origin documentation and transparent supply chain records. We are not just a manufacturer — we’re a US supply chain partner based in India.
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US-Standard Export Packaging & Documentation
Bronze stamped parts are packed per US customer requirements — ESD trays, polybags, or custom packaging for MRO or OEM production line delivery. Each shipment includes ASTM MTC, dimensional inspection report, COC, RoHS declaration, and commercial invoice in USD. ISF (10+2) data is provided to US freight forwarders on request. ISPM-15 certified wooden crating available for heavy or oversized shipments.
Why US Buyers Choose Conex Over Domestic or Chinese Bronze Stamping Suppliers
- Cost: Indian manufacturing costs are 30–50% lower than equivalent US domestic production, with comparable quality for most non-critical applications.
- Tariff Advantage: India-origin bronze stampings do not attract Section 301 tariffs, unlike Chinese equivalents — making the total landed cost highly competitive.
- ASTM Documentation Integrity: Our MTCs are genuine and traceable — not fabricated. US QC teams trust our documentation because it has never failed a third-party audit.
- Complex Parts Capability: US domestic shops often turn down complex, low-volume bronze stampings as uneconomical. Conex’s lower setup costs make these projects viable.
- IP Protection: We sign NDAs and maintain strict drawing confidentiality. Your design stays yours.
What Separates Conex from Other Overseas Bronze Stamping Manufacturers
The difference between Conex and a generic overseas stamping shop is documentation discipline and customer communication. When a US customer has a non-conformance question, our lot-level records answer it within hours — not weeks. When a US engineer needs a DFM consultation on a complex phosphor bronze spring design, our tool room engineers engage in that conversation technically and constructively. And when a US procurement manager needs a price, lead time, and packing list within 24 hours for a budget approval, our team delivers it — not three days later. These are the habits that have built 30-year US customer relationships.
Frequently Asked Questions – US Buyers
Q1. Do your bronze stampings meet ASTM material specifications?
Yes. All bronze alloys are sourced from ASTM-certified mills with genuine MTCs covering chemistry (per ASTM B139, B103, B169, B99, B505) and mechanical properties in the specified temper.
Q2. Can you produce bronze stampings to inch-dimension drawings?
Absolutely. We work in inches or millimeters — our tool room programs both. Simply provide your drawing in your preferred unit system (PDF, DXF, DWG, or STEP/IGES).
Q3. Do you provide PPAP documentation for automotive US customers?
Yes. PPAP Level 1 (Part Submission Warrant) through Level 3 (full dimensional layout, material certs, process capability) are available for automotive OEM and Tier 1/2 supply chain customers.
Q4. Can you produce FAI (First Article Inspection) reports?
Yes. FAI reports with full dimensional balloon drawing and measured values are available in AS9102 format or customer-specific format for aerospace and defense buyers.
Q5. Are bronze stampings from India subject to Section 301 tariffs?
No. Section 301 tariffs apply to Chinese-origin goods. Indian-origin bronze stampings import at standard MFN duty rates. We provide COO documentation for US Customs compliance.
Q6. Can you reverse-engineer bronze parts from a sample or broken piece?
Yes. Send us your sample by courier — we measure, create a drawing, develop tooling, and supply matching production parts. This is a common and successful service for US MRO customers.
Q7. Can you produce EMI/RFI shielding clips from phosphor bronze?
Yes. Stamped phosphor bronze EMI/RFI clips, finger stocks, and PCB edge shields are a regular product for US electronics and defense customers.
Q8. What is the typical lead time for a new custom bronze stamping from India?
Tool development: 3–4 weeks. Production of first order: 1–2 weeks after tool approval. Sea freight to US: 3–5 weeks. Total: approximately 7–11 weeks from PO to US delivery for a new tooled part.
Q9. Do you sign NDAs for US customer drawings?
Yes. We routinely execute NDAs (Non-Disclosure Agreements) before receiving proprietary drawings from US customers. IP protection is taken seriously.
Q10. What is the MOQ for custom bronze stampings?
MOQ is typically 5,000 pieces for custom tooled parts and 1,000 pieces for standard catalog items. We support prototype quantities with a tooling charge.
Q11. Can you supply bronze stampings on a blanket order with scheduled releases?
Yes. Blanket orders with monthly or quarterly call-offs are our standard arrangement for many US customers — lock in pricing, we stock and release on your schedule.
Q12. Can you test to ASTM B117 salt spray requirements?
We can arrange ASTM B117 salt spray testing through third-party labs in India. Plated samples are regularly tested to customer-specified hours (100, 200, 500 hours etc.).
Q13. Do you supply defense / government contractors in the USA?
Yes. We supply defense-adjacent customers. We provide full COO documentation and can support DFARS paperwork requirements. We are transparent about our supply chain for customer audit purposes.
Q14. Can you supply bronze stampings for medical devices (non-magnetic)?
Yes. Phosphor bronze C51000 and C52100 are non-magnetic and have been used in US medical device applications. Biocompatibility documentation requirements should be discussed at inquiry stage.
Q15. How do I start a sourcing inquiry for bronze stampings?
Email your drawing (PDF, DXF, STEP), ASTM grade, temper, quantity, and US delivery port. We respond with a USD quotation and tooling estimate within 24 business hours.
Customer Testimonials
“We’ve sourced custom phosphor bronze spring clips from Conex for our PCB connector assemblies for five years. Their ASTM C51000 H02 material is always verified, their FAI reports are thorough, and when we had a tolerance question on a new design, their tooling engineer solved it in one email. Outstanding partner.”
— Thomas Bradley, Senior Procurement Engineer, Electronics OEM, California, USA
“After a bad experience with a Chinese stamping supplier, we moved our aluminum bronze wear plate production to Conex. The ASTM C61300 MTCs are genuine, the parts passed our 500-hour salt spray test first time, and their pricing — even after freight — beats domestic options. We’re staying with Conex.”
— Sarah Mitchell, Supply Chain Director, Industrial Equipment OEM, Texas, USA
Glossary of US Trade & Engineering Terms
- ASTM B139
- American standard for phosphor bronze rod, bar, and shapes — C51000 and C52100 for stamping strip applications.
- PPAP
- Production Part Approval Process — AIAG standard used in US automotive supply chains requiring documented evidence that parts meet design and specification requirements before full production begins.
- FAI (First Article Inspection)
- A comprehensive inspection of the first production sample per AS9102 or customer format — required by most US aerospace and defense OEMs before production approval.
- DFARS
- Defense Federal Acquisition Regulation Supplement — US DoD rules that may require specialty metals in defense applications to originate from the US or qualifying countries.
- Section 301 Tariffs
- US tariffs imposed on Chinese-origin goods — Indian bronze stampings are exempt under standard MFN treatment.
- ASTM B117
- Standard practice for salt spray (fog) testing — used in the US to evaluate corrosion resistance of plated and unplated metal parts.
- Non-Sparking Bronze
- Bronze alloys (particularly aluminum bronze and phosphor bronze) that do not produce sparks when struck — required in OSHA-regulated explosive/flammable hazard environments.
- EMI/RFI Shield
- An electrically conductive component (often phosphor bronze) that prevents electromagnetic or radio frequency interference from affecting electronic circuits — critical in US defense and telecommunications hardware.
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Ready to Source? Start Your US Inquiry Today!
American OEMs, defense contractors, and electronics manufacturers — Conex Screws and Fasteners is the overseas bronze stamping partner you’ve been looking for. ASTM-certified materials, in-house tooling, FAI/PPAP documentation, and 30 years of US supply chain experience.
📧 Send your drawing or sample today. USD quote and tooling estimate within 24 hours.
✅ ASTM certified material | ✅ India-origin (Section 301 exempt) | ✅ FAI / PPAP available | ✅ NDAs signed | ✅ Ships to all US ports
