Phosphor Bronze Corrugated Spring Washer Stamping is a precision metal stamping part designed to maintain bolt preload under vibration, thermal cycling, and dynamic loads. BQUQ produces these washers
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Phosphor Bronze Corrugated Spring Washer Stamping is a precision metal stamping part designed to maintain bolt preload under vibration, thermal cycling, and dynamic loads. BQUQ produces these washers
Phosphor Bronze Corrugated Spring Washer Stamping is a precision metal stamping part designed to maintain bolt preload under vibration, thermal cycling, and dynamic loads. BQUQ produces these washers from C5210 or C5191 phosphor bronze strip with a thickness tolerance of ±0.01mm, a flatness runout under 0.03mm, and a hardness range of HV 180–220 (equivalent to 48 HRC max). We ship prototype orders in 7 days and production runs in 15–20 days, with no MOQ on first articles.
Phosphor bronze offers a fatigue life of over 1 million cycles at 75% of its yield strength, which is 2.3 times longer than 301 stainless steel under the same load. Its elastic modulus of 110 GPa provides consistent spring force from -40°C to +150°C. This alloy also has a low friction coefficient of 0.35 against steel, which reduces galling on mating threads. For electrical grounding applications, its conductivity of 15% IACS ensures a reliable current path, unlike stainless which is non-conductive.
We stamp corrugated profiles with 3, 5, or 7 waves, each designed for specific deflection ranges. A 3-wave washer deflects 0.15–0.25mm under a 10N load; a 5-wave deflects 0.30–0.45mm; a 7-wave deflects 0.50–0.70mm. Our progressive dies hold wave height to ±0.02mm and wave pitch to ±0.03mm. We can adjust the wave angle from 15° to 30° to fine-tune the load-deflection curve for your assembly's clamping force requirement.
We stock C5210 (8% tin) and C5191 (6% tin) phosphor bronze in thicknesses from 0.10mm to 2.0mm. After stamping, we apply a stress-relief anneal at 280°C for 45 minutes to eliminate residual stress from the forming process. This stabilizes the spring rate to ±5% across a production batch. For high-temperature applications, we offer a precipitation-hardening treatment that raises hardness to HV 220 while maintaining ductility above 8% elongation.
Our progressive stamping dies use carbide inserts with a polished surface finish of Ra 0.2μm on the forming surfaces. This produces washers with an outer diameter tolerance of ±0.01mm, an inner diameter tolerance of +0.02/-0.01mm, and a thickness tolerance of ±0.008mm. The die clearance is set at 5% of material thickness per side, which prevents burr height from exceeding 0.02mm. We run the press at 120 strokes per minute to achieve a production rate of 7,200 parts per hour without compromising dimensional stability.
Standard stamped edges achieve a surface finish of Ra 1.6μm; we can improve this to Ra 0.8μm with a secondary barrel finishing process. Burr height is controlled to under 0.02mm on the shear zone, which is critical for applications where the washer sits against a sealing face. For electrical contacts, we offer selective gold or silver plating on the contact surfaces, with a plating thickness of 0.5–1.0μm per MIL-DTL-45204 standards.
Every production batch passes through a coordinate measuring machine (CMM) with a resolution of 0.001mm to verify outer diameter, inner diameter, wave height, and pitch. We perform Vickers hardness testing on three samples per lot, ensuring values stay within HV 180–220. A spring rate test on a calibrated load stand confirms the deflection curve matches your specification within ±5%. We include a full dimensional report and material certificate (EN 10204 3.1) with every shipment.
| Specification | Value |
|---|---|
| Material | C5210 / C5191 Phosphor Bronze |
| Thickness | 0.10 – 2.0 mm |
| Outer Diameter | 3.0 – 80.0 mm |
| Inner Diameter | 1.5 – 60.0 mm |
| Hardness | HV 180 – 220 (48 HRC max) |
| Dimensional Tolerance | ±0.01 mm |
| Surface Finish | Ra 1.6 μm (Ra 0.8 μm optional) |
| Runout (Flatness) | ≤ 0.03 mm |
| Lead Time (Prototype) | 7 days |
| Lead Time (Production) | 15 – 20 days |
| MOQ | No MOQ (first article free) |
We have no MOQ for prototype orders; production runs start at 500 pieces, but we can accommodate smaller batches for testing.
Yes, we adjust the die design for any wave count from 3 to 7 and any diameter within our range, with a tooling modification fee of $200–$500 depending on complexity.
We use in-process SPC monitoring on every 100th part and perform a full CMM inspection on five parts per batch, with a final audit before packing.
Prototype samples ship in 7 days after drawing approval; production quantities ship in 15–20 days, with express options available for urgent orders.
For a firm quote within 12 hours, send your drawing to sc@bquq.com or WhatsApp us at +86 13713157787. We respond with DFM feedback and pricing the same day. For more on tool selection in related processes, see our CNC cutting tool selection guide. To understand how we achieve ±0.01mm tolerances, check our CNC machining tolerances guide. This is precision manufacturing made in China, backed by 20 years of stamping expertise.
| Parameter | Capability |
|---|---|
| Materials | SPCC, SGCC, SUS301/304/316, brass, copper, beryllium copper, phosphor bronze |
| Process | Progressive die stamping, fine blanking, deep drawing, bending, tapping |
| Tolerance | ±0.01mm standard, ±0.005mm on request |
| Surface | Zinc plating, nickel, tin, gold, powder coating, passivation, anodizing |
| Die Size | Up to 1200 x 800 mm, 16-250 ton presses |
| Thickness | 0.05 - 6.0 mm sheet metal, wire 0.1 - 8.0 mm |
| Prototype | 7-15 days tooling, no MOQ on samples |
| Inspection | Full report per batch, CMM and optical measurement |
