What We Deliver: Contacts That Hold 0.005 mm Tolerance in High-Cycle Switching We are a High Precision Electrical Contact Stamping Parts Supplier operating from a 20-year-old factory in Dongguan, Ch
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What We Deliver: Contacts That Hold 0.005 mm Tolerance in High-Cycle Switching We are a High Precision Electrical Contact Stamping Parts Supplier operating from a 20-year-old factory in Dongguan, Ch
We are a High Precision Electrical Contact Stamping Parts Supplier operating from a 20-year-old factory in Dongguan, China. Our stamped contacts are flat within 0.01 mm across the entire surface, with edge burr held under 0.02 mm. You get consistent hardness of 120–180 HRC (depending on alloy), a surface finish of Ra 0.4 µm, and a guaranteed lead time of 7 days for standard geometries. No rework, no tolerance drift over 100,000 cycles.
Electrical contacts fail when springback bends the geometry out of spec. Our tooling compensates for material memory using over-bend angles calibrated per lot. For 0.1 mm thick beryllium copper (C17200), we hold a bend radius of 0.05 mm with a springback deviation of less than 0.5 degrees. For phosphor bronze (C5210), we adjust die clearance to 4% of material thickness—this keeps contact force stable between 0.3 N and 0.5 N across a temperature range of -40°C to +150°C.
We stock five base materials: C17200 beryllium copper, C5210 phosphor bronze, C7025 copper-nickel-silicon, brass C2680, and stainless steel 301. After stamping, we apply selective heat treatment—solution annealing at 780°C followed by age hardening at 320°C for beryllium copper. This yields a hardness of 170–190 HRC and electrical conductivity of 22% IACS (International Annealed Copper Standard). For silver-plated contacts, we use a 2 µm nickel underplate and 4 µm silver top layer, applied via continuous reel-to-reel plating to avoid edge buildup.
Our progressive dies use tungsten carbide inserts (grade K10) for punch and die sections. For a typical 0.2 mm thick contact, we achieve 5 million strokes before insert replacement. We monitor die wear every 50,000 strokes using an optical comparator—when wear reaches 0.003 mm, we stop production and regrind. This prevents dimensional drift on critical surfaces like mating tabs and spring arms. You receive parts that fit your mating connector every time, even on the 10th million piece.
We do not sample when the part is small or high-value. Every contact is measured for width, height, and bend angle using a Keyence IM-8000 vision system (repeatability ±0.001 mm). Surface finish is verified with a Mitutoyo SJ-210 profilometer on 5% of the lot. Hardness is tested per ASTM E18 on a Rockwell scale, with a tolerance of ±3 HRC. We include a full inspection report in your shipment, showing Cpk values above 1.67 for all critical dimensions.
| Parameter | Value / Range |
|---|---|
| Material thickness | 0.05 mm – 2.0 mm (strip width up to 150 mm) |
| Base materials | C17200, C5210, C7025, C2680, SUS301 |
| Plating options | Ag (2–5 µm), Au (0.5–2 µm), Ni (1–3 µm), Sn (3–8 µm) |
| Hardness (as supplied) | 120–190 HRC (depends on alloy and heat treat) |
| Dimensional tolerance | ±0.005 mm on critical features, ±0.01 mm on non-critical |
| Surface finish Ra | 0.4 µm (max) on stamped surfaces, 0.2 µm on plated areas |
| Flatness / runout | 0.01 mm total on 10 mm length, 0.02 mm on 25 mm length |
| Burr height | ≤0.02 mm (standard), ≤0.01 mm (critical edge) |
| Lead time | 7 days for standard parts, 15 days for custom tooling |
| Minimum order quantity | No MOQ (sample orders accepted from 100 pieces) |
Our factory sits in Dongguan, within 80 km of two major international airports and the Port of Shenzhen. This cuts freight time to 5 days for air cargo (DDP to US or EU) and 18 days for sea freight. We keep raw material inventory for C17200 and C5210 in-house—over 20 tons in strip form—so we can start your order without waiting for material import. You get the cost advantage of precision manufacturing made in China without the typical supply chain risk.
No MOQ—we accept 100-piece prototypes and scale to millions per month without changing your unit price.
Yes, we work from PDF, STEP, or DXF files, and we can reverse-engineer a physical sample within 3 days using our CMM and vision system.
We test plating thickness with X-ray fluorescence (XRF) on every plating batch, and we verify adhesion via a 90-degree bend test on 10% of parts.
15 days for a new progressive die (including design, machining, and tryout), then 7 days for first production parts.
Email your 2D or 3D file to sc@bquq.com or message us on WhatsApp at +86 13713157787. We will review your material, tolerance, and volume requirements, then return a fixed price and delivery date within 12 business hours. For complex geometries, we also recommend reviewing our CNC cutting tool selection guide to understand how we handle secondary finishing ops, and our CNC machining tolerances guide to see how we apply GD&T principles to stamped parts. No MOQ, no haggling—just a clear spec sheet and a part that works.
| 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 |
