This is the Stamped Metal Hooks Latches Clasps Collection from BQUQ — a family of high‑force, corrosion‑resistant fastening components produced by 20‑year precision manufacturing in Dongguan, China. E
This is the Stamped Metal Hooks Latches Clasps Collection from BQUQ — a family of high‑force, corrosion‑resistant fastening components produced by 20‑year precision manufacturing in Dongguan, China. Every part ships with a tolerance of ±0.05 mm, a surface finish of Ra 1.6 µm, and a hardness range of 40–52 HRC, with a standard lead time of 7 days from drawing approval.
Spring‑back is the enemy of stamped fasteners. Our die‑design team compensates for material elasticity using a 3‑step coining process — first a 90° pre‑bend, then a 102° over‑bend, and finally a calibration strike at 120 tons. This locks the final angle to ±0.5°. For high‑cycle latches, we add a micro‑embossed rib along the bend radius, increasing fatigue life by 300% compared to flat‑bend parts. The result: hooks that hold 15 kg without permanent deformation after 50,000 open‑close cycles.
We stock five base materials — SUS 301‑H, SUS 304, SPCC, 65Mn spring steel, and C5210 phosphor bronze. For stainless parts, we use a bright annealing process at 1,050 °C to restore ductility after stamping, then a controlled cooling ramp to prevent carbide precipitation. Spring steel hooks get oil‑quenched at 830 °C and tempered at 320 °C, yielding a through‑hardness of 48–52 HRC. If you need salt‑spray resistance beyond 72 hours, we apply a trivalent zinc‑nickel plating (8–12 µm) that passes 120 hours in ASTM B117 — standard on all carbon steel items.
| Specification | Value / Range |
|---|---|
| Materials | SUS 301‑H, SUS 304, SPCC, 65Mn, C5210 |
| Thickness (stock) | 0.3 mm – 3.0 mm |
| Hook width | 5 mm – 60 mm |
| Hardness (as‑tempered) | 40 – 52 HRC (65Mn), 200 – 250 HV (SUS) |
| Bend angle tolerance | ±0.5° |
| Flatness / twist | ≤ 0.1 mm over 50 mm length |
| Surface finish | Ra 1.6 µm (standard), Ra 0.8 µm (polished) |
| Runout (hole‑to‑hook center) | ≤ 0.08 mm |
| Lead time (prototype) | 3 days / 7 days for production |
| MOQ | No MOQ — start with 1 piece |
No part leaves without three checks. First, a CMM probe measures all hole positions and bend angles to ±0.02 mm. Second, a digital pull‑force tester loads each latch to 1.5× its rated working load — if it holds for 10 seconds without fracture, it passes. Third, a visual scan under 5× magnification rejects any edge burr above 0.05 mm. We include a 2D inspection report with every batch, even for single‑piece orders. For your reference, our CNC machining tolerances guide explains how we achieve these numbers on complex geometries.
Choose from four standard finishes — zinc‑nickel (silver), black oxide (matte), electroless nickel (10 µm), or powder coat (60 µm, RAL colors). For food‑contact clasps, we offer a passivated SUS 304 surface that meets FDA 21 CFR 175.300. Every finish is applied after stamping to avoid edge‑cut corrosion. If you are unsure which coating fits your environment, send us a sample — we test it in a 5% NaCl fog chamber free of charge.
Stamping dies wear unevenly after 200,000 strokes, causing burrs and dimensional drift. We run a preventive maintenance schedule — every 50,000 hits, we re‑grind the punch tip and check the die clearance with a feeler gauge. This is why our parts stay within ±0.05 mm even on the 500,000th piece. If you want to see how we manage this internally, our CNC cutting tool selection guide covers the same discipline applied to cutting tools, not just dies.
Each hook, latch, or clasp is individually wrapped in anti‑rust VCI paper, then packed in reinforced cartons with static‑shield liners. A laser‑etched part number and heat‑batch code sit on every piece — traceable back to the coil lot, stamping press, and operator. For 1,000+ piece orders, we use dividers to prevent surface scratches during transit. All packaging meets ISTA‑3A drop test standards.
No MOQ — you can order one prototype piece for fit‑testing, and we will not charge tooling separately until you approve the sample.
Yes — send your 2D or 3D drawing (STEP, IGES, PDF) and we adjust the die design within 24 hours; complex custom bends may add 2 days to the tooling phase.
Every piece, regardless of batch size, goes through the same CMM measurement, pull‑force test, and burr inspection, and we provide a full inspection report with the shipment.
A prototype is ready in 3 days, and production starts within 7 days after drawing approval — for standard sizes in stock, we ship the same day.
Send your drawing for a firm quote within 12 hours — email sc@bquq.com or WhatsApp +86 13713157787. We will confirm material cost, tooling (if any), and delivery date in one reply. The Stamped Metal Hooks Latches Clasps Collection is ready for your next design.
| 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 |
