This is a metal stamping shrapnel — a precision-formed spring contact or clip produced by high-speed progressive dies in our Dongguan factory. You get a part with 0.01mm toleran
BQUQ China Dongguan Stamping Manufacturer Supplier Shrapnel Parts
This is a metal stamping shrapnel — a precision-formed spring contact or clip produced by high-speed progressive dies in our Dongguan factory. You get a part with ±0.01mm tolerance on critical surfa
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This is a metal stamping shrapnel — a precision-formed spring contact or clip produced by high-speed progressive dies in our Dongguan factory. You get a part with ±0.01mm tolerance on critical surfaces, hardness of 45–52 HRC, and a lead time of 12 working days from drawing approval. BQUQ has run 20 years of CNC machining and stamping lines, so every shrapnel ships burr-free and ready for assembly.
How Progressive Die Stamping Controls Shrapnel Spring Force
Shrapnel parts live or die by their spring rate. We use multi-stage progressive dies — 16 to 24 stations — where each step bends, coins, and pierces in controlled increments. This avoids work-hardening cracks and gives a consistent force curve across 100,000 parts. Our tooling steel is D2 or M2, ground to a surface finish of Ra 0.2µm. That die precision translates directly to your part's repeatability: we hold flatness within 0.02mm over a 30mm length, and we measure spring force on a 2kN load cell before every batch leaves the shop.
Materials and Heat Treatment We Use for Shrapnel
We stock three primary alloys for shrapnel stamping: 301 stainless steel (full hard), beryllium copper (C17200, aged to 38–42 HRC), and 65Mn spring steel. For high-cycle applications, we add a stress-relief anneal at 315°C for 45 minutes after stamping — this removes residual stresses and prevents fatigue failure. If your drawing calls for a specific hardness, we can adjust tempering parameters: 65Mn reaches 44–50 HRC, while 301 SS sits at 40–46 HRC. We also offer electroless nickel plating (0.5–1.5µm) or gold flash (0.1–0.3µm) for corrosion resistance on contact surfaces.
Inspection Before Every Shipment: Force, Dimension, and Surface
No shrapnel leaves without a three-stage check. First, we run a 100% optical scan for burr height (limit: 0.03mm max) and surface scratches. Second, we sample 5 parts per lot (per AQL 2.5) for coordinate measuring machine (CMM) verification — this checks hole positions, bend angles, and overall length to ±0.01mm. Third, we test spring force on a custom jig: each sample must fall within ±10% of your specified load at a defined deflection. We send you a digital inspection report with photos and force curves for every lot, even for a single prototype.
Tooling Options: Low-Cost Prototype Dies vs. High-Volume Carbide Dies
For 1 to 500 pieces, we use a modular soft die — cut from pre-hardened P20, with delivery in 5 days and a tooling cost of $300–$800. For volumes above 5,000 parts per year, we invest in a tungsten carbide progressive die — this lasts 5–10 million strokes before regrinding, and the per-part price drops by 40% compared to soft tooling. We keep your die in our climate-controlled tool room, free of charge, for 5 years. If you modify the design later, die modification costs are quoted at actual machining time only.
Secondary Operations: Forming, Riveting, and Contact Welding
Shrapnel often needs more than just stamping. We add secondary operations in-house: bottom bending to 90°±0.5°, side curling for wire contact, and riveting of a silver contact tip (0.3mm thick) for low-resistance switching. We also perform resistance welding of a gold-plated copper tab onto the shrapnel body — weld strength exceeds 15N pull force. These operations run on dedicated CNC bending machines and spot welders, with the same ±0.01mm control as the stamping step. You get a finished sub-assembly, not a raw stamped part.
Lead Time Breakdown: From Drawing to Your Dock
Typical timeline for a custom shrapnel: 1 day for DFM feedback and quote, 2 days for soft tooling (if under 500 pcs), 7 days for carbide tooling (if over 5,000 pcs), and 3–5 days for production and inspection. That puts a standard order at 12 working days total. Air freight to the US West Coast takes 3 days (DDP, no hidden customs fees); sea freight takes 18–25 days. We run a 24/5 production shift, so urgent orders can cut the lead time to 7 days with a 15% rush fee — but we never skip inspection to save time.
Cost Drivers and How to Reduce Your Shrapnel Price
Your unit price is driven by three factors: material thickness (0.1mm vs. 0.5mm changes stamping speed from 400 to 150 strokes per minute), tolerance class (±0.01mm requires 30% slower machine speed), and surface finish (a mirror polish Ra 0.1µm adds $0.02 per part). To cut cost, specify only the tolerances you actually need — a ±0.05mm on a non-critical hole can reduce price by 18%. Also, batch multiple design variants into one die to share tooling cost. We provide a cost breakdown table with every quote, so you see exactly where the money goes.
No MOQ — we accept a single prototype for testing, and you only pay for the parts you order, not a setup fee.
Can you match my drawing exactly, including unusual bend radii?
Yes, we adjust the die radius to your drawing, but we recommend a minimum inside bend radius of 1x material thickness to avoid stress cracking.
How do you ensure batch-to-batch consistency for high-volume orders?
We use the same die for every batch, run a SPC process control chart on dimensions, and re-certify the die after every 50,000 strokes.
What is your fastest possible lead time for an urgent shrapnel order?
For existing dies, we can ship in 5 days with air freight; for new tooling, 9 days with a rush (15% surcharge) — but inspection is never bypassed.
Get a firm quote within 12 hours. Send your drawing to sc@bquq.com or WhatsApp +86 13713157787. We reply with DFM feedback, a cost breakdown, and a delivery date — no obligation. For more on tooling upkeep, read our CNC cutting tool selection guide. To understand how tight we can hold tolerances, check the CNC machining tolerances guide.
BQUQ is a China Dongguan Stamping Manufacturer Supplier Shrapnel specialist — precision manufacturing, made in China, with no MOQ. Your part, your spec, our machines.
