OpeningSend us your drawing. We build your extension spring to spec, not to guesswork.Every coil is wound, heat-treated, and stress-relieved on our own lines. Before shipment, we verify load at a spec
Send us your drawing. We build your extension spring to spec, not to guesswork.
Every coil is wound, heat-treated, and stress-relieved on our own lines. Before shipment, we verify load at a specified length, free length, and outside diameter. If it does not match your drawing, it does not ship.
We are a precision manufacturing factory in Dongguan, China. 20 years in the business. CNC machining, metal stamping, springs, and heat sinks under one roof. You talk to an engineer, not a sales script.
| Parameter | Value |
|---|---|
| Material | Stainless steel 302 (AISI), 304, 316L, 17-7PH, 631 |
| Wire diameter | 0.10 mm – 12.0 mm |
| Spring index (D/d) | 3 – 15 |
| Free length | 2 mm – 600 mm |
| Max outside diameter | 80 mm |
| Coil direction | Right hand (standard), left hand available |
| Ends | Full loops, cross-over loops, extended loops, German loops |
| Manufacturing process | CNC coiling (0.1–5.0 mm wire), auto-coiling (5.0–12.0 mm wire) |
| Heat treatment | Stress relief at 260–400°C, vacuum or inert atmosphere |
| Surface finish | Plain, passivated, electro-polished, shot-peened |
| Tolerance | DIN 2095 Grade 1 (tight), Grade 2 (standard) |
| Testing | Load at length, spring rate, free length, OD, surface crack check |
| Batch size | 1 – 500,000 pcs |
| Certifications | ISO 9001:2015, material mill certs (EN 10204 3.1) |
We use Japanese and German coiling machines. Wire is sourced from certified mills only. Each batch gets a heat number, and we keep that traceability for 10 years.
1. Batch-traceable quality, not a lottery. Every heat of wire is logged. Every production batch gets a unique ID. If a part fails in your assembly, we can trace it back to the wire supplier, coiling machine, and operator shift. We do this because your liability ends where our quality begins.
2. Inspection report with every batch. You get a dimensional report and a load test report. We measure free length, OD, and load at your specified deflection. For critical springs, we add a 100% load sorting. No extra charge for standard reports. You know exactly what you receive before it leaves our dock.
3. One factory for CNC, stamping, springs, and heat sinks. Your spring is not an orphan part. We machine the brackets, stamp the retainers, and even make the heat sink it mounts to. One purchase order, one quality system, one shipping date. You save on logistics and you kill the tolerance stacking between different suppliers.
These are not toy springs. Our customers use them in:
If your spring fails, your product stops. We build them to survive 100,000 cycles minimum, and we test to your cycle requirement if you specify it.
Looking for a different part? We also machine Custom Mixed Spring Types Collection 03 – Precision Manufacturing, No MOQ in the same Dongguan factory.
Q: What is your MOQ? No MOQ. We make one prototype for you to test, then scale to production. Prototype lead time is 7 days, and we ship via DHL or FedEx. For production runs, we split into smaller batches to keep your inventory flexible.
Q: How do you control tolerance and quality? We start with DIN 2095 as the baseline. For critical dimensions, we use a CNC spring tester with a load cell accuracy of ±0.5%. Every batch is checked at first article, mid-run, and final inspection. We keep the first article for 24 months. If you need PPAP Level 3, we provide it.
Q: What is your lead time for custom springs? Prototypes: 7–12 days after drawing approval. Production: 15–20 days for standard stainless steel. For urgent orders, we can expedite to 5 days for prototypes at a 15% surcharge. We will tell you the exact date before you place the order.
Q: Can you provide material certificates? Yes. We provide EN 10204 3.1 mill certificates for stainless steel wire. We also provide our own heat treatment logs and hardness test reports. All documents are in English and sent with the shipment.
Stop guessing. Send us your PDF, STEP, or IGES file. We review it for manufacturability and send you a firm quote within 12 hours.
Email: sc@bquq.com WhatsApp: +86 13713157787
Include your target load, deflection, and cycle life if you have them. If you do not have a drawing, send a sample and we will reverse-engineer it. Precision manufacturing, made in China, no MOQ. Your custom springs, done right.
| Parameter | Capability |
|---|---|
| Materials | SUS302/304/316, SWC piano wire, SWP music wire, 65Mn, phosphor bronze, beryllium copper |
| Types | Compression, extension, torsion, wire forms, battery springs, touch springs |
| Wire Diameter | 0.05 - 12.0 mm |
| Tolerance | ±0.02mm standard, ±0.01mm on request |
| Surface | Zinc plating, nickel, black oxide, passivation, shot peening |
| Machines | CNC spring coiling machines, torsion machines, wire forming machines |
| Prototype | 72 hours, no MOQ on samples |
| Inspection | Load test per batch, fatigue test data on request |
