OpeningYour drawing defines the spring. Our job is to make it exactly that—no guesses, no shortcuts. We are a precision manufacturing factory in Dongguan, China, with 20 years of spring-making experie
Your drawing defines the spring. Our job is to make it exactly that—no guesses, no shortcuts. We are a precision manufacturing factory in Dongguan, China, with 20 years of spring-making experience. Every stainless steel extension tension spring is produced to your print, then verified before shipment.
We do not stock generic springs. We build yours. Send us your drawing, and we will confirm manufacturability, cost, and delivery within 12 hours.
| Parameter | Value |
|---|---|
| Material grades | SUS302, SUS304, SUS316, SUS631 (17-7PH), Inconel X-750 |
| Wire diameter | 0.10 mm – 12.0 mm |
| Free length | 2 mm – 500 mm |
| Outer diameter | 1.0 mm – 80 mm |
| Coil count | 2 – 200 coils, custom pitch |
| Hook types | Full loop, half loop, extended hook, cross-over center, German loop |
| Tolerance (wire dia.) | ±0.02 mm (DIN 2095 Grade 1) |
| Tolerance (free length) | ±0.1 mm or ±1% of length, whichever is greater |
| Surface finish | Passivated, electropolished, zinc-plated, or as-drawn |
| Production process | CNC coiling, stress relieving, hook forming, grinding (if required) |
| Testing | Load testing at specified deflection, fatigue testing on request |
| Batch size | 1 – 500,000 pieces, no MOQ |
| Lead time | Prototype: 5–7 days; Production: 10–15 days |
| Quality system | ISO 9001:2015, IATF 16949 (automotive) |
All springs are made on CNC coiling machines with servo-controlled wire feed. This ensures repeatable geometry across batches. We use optical comparators and digital force testers for verification.
1. Batch-traceable quality Each production lot gets a unique heat number and work order. We record wire supplier, machine settings, and inspection results for that batch. If a problem appears downstream, we can trace it back to the exact coil of wire and the exact shift that made it. You get a traceability report with every shipment.
2. Inspection report per batch We do not just check the first piece and assume the rest are fine. Every batch goes through a final inspection: free length, outer diameter, hook alignment, and load at specified deflection. You receive a signed inspection report with actual measured values, not just a pass/fail stamp. For critical springs, we can provide full dimensional reports with CMM data.
3. One factory for CNC + stamping + spring + heatsink Your assembly might need more than just springs. We also run CNC machining, metal stamping, and heatsink production lines under the same roof. That means you can order a spring, a stamped bracket, a CNC-machined shaft, and a heatsink from one supplier. One purchase order, one quality standard, one shipping point. This cuts your supplier management time and reduces logistics cost.
Custom stainless steel extension tension springs are not shelf items. They are engineered for specific loads and environments. Typical applications include:
If your application requires a spring that pulls two components together with a specific force, this is the product line for you.
Looking for a different part? We also machine Custom Double Coil Torsion Springs | Precision Manufacturing China in the same Dongguan factory.
Q: Do you really have no MOQ? A: Yes. We run prototypes from 1 piece. For production, we accept any quantity. The unit price will be higher for small batches, but the tooling cost is zero—our CNC machines are fully programmable. You pay only for what we make.
Q: How do you control tolerance and quality? A: We follow DIN 2095 Grade 1 as the default. For critical dimensions, we use a 100% inspection plan. Our quality team measures free length, outer diameter, hook position, and load at specified deflection. We provide an inspection report per batch. If you need PPAP level 3, we can do that too.
Q: What is the lead time for custom springs? A: Prototypes ship in 5–7 days after drawing approval. Production runs take 10–15 days for standard stainless steel grades. For exotic alloys like Inconel, add 3–5 days for material procurement. We ship worldwide via DHL, FedEx, or sea freight.
Q: Can you provide material certificates? A: Yes. Every batch comes with a mill test report from the wire supplier, showing chemical composition and mechanical properties. For aerospace or medical applications, we can provide full traceability to the heat number.
Stop guessing if your spring design is manufacturable. We will review your drawing and give you a firm quote within 12 hours. Include wire diameter, coil count, hook style, free length, and load requirements.
Email: sc@bquq.com WhatsApp: +86 13713157787
Precision manufacturing, made in China, with no MOQ and full traceability. Your drawing is the starting point. We handle the rest.
| 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 |
