Brass Parts India manufactures and exports high-precision Phosphor Bronze Stamped Parts and Phosphor Bronze (PB) Pressed Parts from Jamnagar, India — serving connector manufacturers, spring makers, electrical OEMs, bearing producers, and industrial distributors in the USA and worldwide. Phosphor Bronze (PB) combines outstanding spring characteristics, excellent electrical conductivity, superior corrosion resistance, and exceptional fatigue life — making it the premier alloy for stamped and deep-drawn components in demanding electrical and mechanical applications.
Our phosphor bronze stamping operations utilize precision progressive, compound, and fine-blanking tooling to produce connector contacts, spring clips, shim washers, deep-drawn cups, electrical terminals, and custom formed components with the tight dimensional control and surface quality that USA OEM customers demand.
Phosphor Bronze Stamped and Pressed Products
Phosphor Bronze Electrical Contacts and Connector Terminals
Spring-temper phosphor bronze stamped contacts for PCB edge connectors, IDC connectors, wire-to-board terminals, and IC socket contacts. The combination of high spring force retention, good conductivity (~15% IACS), and tin/gold plating compatibility makes PB the dominant alloy for these applications. Produced from C51000/C52100 (PB-1/PB-2) strip to tolerances of ±0.01 mm in thickness and ±0.05 mm in profile dimensions.
Phosphor Bronze Spring Clips and Leaf Springs
Precision-formed PB spring clips, cantilever springs, leaf springs, and snap-fit retainers for electrical enclosures, battery contacts, lamp holders, and mechanical assemblies. Phosphor bronze in spring temper (H08/H10) maintains spring force under millions of cycles — essential for connectors, switches, and relays that must operate for years without relaxation.
Phosphor Bronze Washers and Shim Stock
Precision-stamped PB washers, thrust washers, and shim stock for bearing applications, gear assemblies, and precision adjustment. Phosphor bronze’s low coefficient of friction and excellent wear resistance make it ideal for sliding contact applications. Available in thicknesses from 0.1 mm to 3 mm; OD from 4 mm to 150 mm.
Phosphor Bronze Deep-Drawn Parts
Deep-drawn PB cups, cylinders, and shells for battery terminals, relay cans, capacitor enclosures, fuse end caps, and precision cylindrical housings. Phosphor bronze’s excellent deep-draw formability (particularly in O-temper strip) allows draw ratios up to 2.2:1 in a single draw. Multiple draw and redraw operations available for high aspect ratio parts.
Phosphor Bronze Bushings and Bearings
Wrapped PB bushings and plain bearings formed from C51000/C54400 strip for light-load bearing applications. Self-lubricating impregnated versions also available. Used in automotive door hinges, agricultural equipment, industrial machinery, and small electric motor bearing housings.
Phosphor Bronze Stamped EMI/RFI Shielding Parts
PB finger gaskets, EMI shielding clips, board-level shields, and conductive gasket frames for PCB assemblies and electronic enclosures. Phosphor bronze’s spring resilience maintains consistent contact pressure on mating surfaces for reliable EMI shielding even after thousands of insertions.
Phosphor Bronze Plumbing and Valve Disc Stampings
Check valve discs, seat washers, ball retainers, and sealing rings stamped from C51000 and C54400 PB strip. Excellent corrosion resistance in water and many chemical media. Used in pumps, valves, and fluid handling equipment.
Custom Phosphor Bronze Stampings to Drawing
Any shape, profile, or formed geometry in phosphor bronze from your engineering drawings or sample parts. We handle progressive tooling development for high-volume parts and compound/prototype tooling for lower volumes. Full tooling design support from our in-house tool engineers.
Phosphor Bronze Grades and International Equivalents
| ASTM/UNS (USA) | EN (Europe) | BS (UK) | DIN (Germany) | JIS (Japan) | Composition & Key Properties |
|---|---|---|---|---|---|
| C51000 (PB-1) | CW451K / CuSn5 | PB102 | 2.1020 / CuSn5 | C5191 | Cu-5%Sn-0.03%P; best overall spring + conductivity balance; most common connector grade |
| C51100 | CW452K / CuSn4 | — | CuSn4 | C5101 | Cu-4%Sn; slightly higher conductivity than C51000; used for high-conductivity spring contacts |
| C52100 (PB-2) | CW453K / CuSn8 | PB103 | 2.1030 / CuSn8 | C5210 | Cu-8%Sn; highest strength and spring force; for heavy-duty springs and bearings |
| C52400 | CW454K / CuSn9 | — | 2.1060 / CuSn9 | — | Cu-9%Sn; maximum hardness and wear resistance; bearing grade |
| C54400 (Free-Cutting PB) | CW456K / CuSn4Pb4Zn3 | — | — | C5441 | Cu-4%Sn-4%Pb-3%Zn; leaded PB for machined bearings, bushings; good machinability |
Key Mechanical Properties of Phosphor Bronze (C51000)
| Property | Annealed (O) | Spring Temper (H08) |
|---|---|---|
| Tensile Strength | 325 N/mm² (47 ksi) | 690–760 N/mm² (100–110 ksi) |
| Yield Strength (0.2%) | 130 N/mm² (19 ksi) | 620–690 N/mm² (90–100 ksi) |
| Elongation | 50–60% | 3–7% |
| Hardness | 55 HRB | 90–95 HRB |
| Electrical Conductivity | 15% IACS | 15% IACS |
| Elastic Modulus | 110 GPa (16 Msi) | 110 GPa |
| Fatigue Limit | — | ~180 N/mm² at 10⁸ cycles |
Stamping Process Capabilities for Phosphor Bronze
- Progressive Die Stamping: Complex profiles, formed features, multiple bends — high-volume output from coil stock
- Compound Die: Simultaneous blank + pierce for precise flat parts; tolerances to ±0.01 mm
- Fine Blanking: Smooth edges, very tight tolerances for contact and precision parts
- Deep Drawing: Cups and cylinders from O-temper PB strip; single and multi-draw sequences
- Bending and Forming: V, U, Z, channel, and custom bend profiles; bend radius down to 0.5× material thickness
- Embossing and Coining: Contact nubs, locating dimples, reinforcing ribs, and logo marks
- Strip Thickness: 0.05 mm to 3 mm phosphor bronze strip
- Press Capacity: 5T – 200T presses; high-speed up to 600 strokes/min for fine contact stampings
Surface Finishing for Phosphor Bronze Stampings
- Tin Plating (Matte or Bright): 1–5 µm; most common for electrical connector contacts; good solderability and fretting resistance
- Gold Plating (Selective or Full): 0.05–1.27 µm over nickel undercoat; for low-force connectors and precious contact applications (ASTM B488)
- Nickel Plating: 2–5 µm; barrier layer for harsh environments; also as undercoat before gold/tin
- Silver Plating: For high-conductivity contacts and RF connectors
- As-Stamped: Cleaned and deburred; for bearing and mechanical applications where plating is not required
Applications of Phosphor Bronze Stampings
- PCB connectors, edge card connectors, and socket contacts
- Battery terminals and spring contacts
- Relay, switch, and breaker contact springs
- EMI/RFI shielding gaskets and finger springs
- Precision bearings, thrust washers, and bushings
- Valve seats, disc springs, and diaphragms
- Fuse clips and fuse end caps
- Medical device spring components and sensor contacts
- Automotive door latch springs and seat mechanisms
Why Choose Brass Parts India for Phosphor Bronze Stampings?
- Specialist in Non-Ferrous Stamping: Unlike general steel pressings shops, we specialize in brass, copper, phosphor bronze, and aluminum — with deep alloy knowledge and optimized tooling for each material.
- In-House Tool Design and Manufacture: We build our own progressive and compound dies — faster turnaround, better quality, lower cost.
- High-Speed Precision Presses: Suitable for fine contact stampings and high-volume spring parts.
- Plating In-House or Nearby: Tin, nickel, gold, and silver plating coordinated as part of our supply chain.
- Competitive Pricing: Typically USD 0.01–USD 3.00/piece CIF US ports depending on material, tooling, and volume.
- ISO 9001 Quality System: AQL sampling, first article inspection, and full dimensional records.
- USA Market Focus: Experienced with IPC, EIA, and ASTM B standards for connector and electrical contact stampings.
Frequently Asked Questions – Phosphor Bronze Stamped Parts
Q1: What is the difference between C51000 and C52100 phosphor bronze?
A: C51000 (5% tin) is the most common connector and spring grade — best balance of spring force, conductivity, and formability. C52100 (8% tin) has higher strength and better fatigue life but is harder to form and has lower conductivity. C52100 is preferred for heavy-duty springs and high-wear bearing applications where C51000’s strength is insufficient.
Q2: What temper of phosphor bronze is best for spring contacts?
A: Spring temper (H08 per ASTM B103, equivalent to ½ hard through hard) is standard for connector contacts. Extra-spring (H10) is used when maximum spring force retention is required. Annealed (O) temper is used for deep-draw applications where maximum formability is needed.
Q3: Can phosphor bronze be soldered and welded?
A: Phosphor bronze solders excellently — especially tin-plated surfaces — making it ideal for PCB-mounted contacts and terminals. However, it is generally not fusion-welded due to tin content. Resistance spot welding and laser welding of thin strip are possible under controlled conditions.
Q4: What is your minimum order for phosphor bronze stampings?
A: For standard and simple progressive die parts: 10,000 pieces per part number. For complex precision contact stampings: 25,000 pieces. Prototype/sample batches of 500–1,000 pieces available for new tooling qualification at higher per-piece pricing.
Q5: Do you supply phosphor bronze strip/coil for in-house stamping?
A: Yes — we can supply certified C51000/C52100 phosphor bronze strip and coil per ASTM B103 and B105 in cut lengths or coils, with full mill certifications. Thicknesses 0.05 mm to 3 mm; widths to 600 mm. Please contact us for strip pricing separate from stamped parts.
Request a Quote
Contact Brass Parts India for phosphor bronze stamped and pressed parts. Email your drawings, alloy grade, temper, and quantity requirements to sales@brass-parts-india.com or call +91 22 4344 9300. Competitive CIF pricing to all US seaports. 24-hour response.
