OpeningSend us your drawing. We build the steel torsion spring exactly to your print—wire diameter, coil count, leg length, and wind direction. Every spring is verified before shipment. We do not gues
Send us your drawing. We build the steel torsion spring exactly to your print—wire diameter, coil count, leg length, and wind direction. Every spring is verified before shipment. We do not guess.
At a glance: Tolerances down to ±0.05 mm on wire diameter and ±1° on leg angle. Lead time 7-15 days for prototypes. No MOQ. 100% inspection report included with every batch.
We are a precision manufacturing factory in Dongguan, China. 20 years in the business. Our CNC, stamping, spring, and heat sink lines run under one roof. You get one supplier, one quality standard, one invoice.
| Parameter | Value |
|---|---|
| Materials | Spring steel (EN 10270-1 DH), stainless steel (302, 316, 17-7 PH), music wire (ASTM A228), oil-tempered chrome silicon (ASTM A401) |
| Wire diameter | 0.1 mm – 12.0 mm |
| Max coil diameter | 80 mm |
| Max free length | 200 mm |
| Process | CNC coiling (automatic), hot coiling for heavy wire, stress-relieving oven, shot peening (optional) |
| Tolerance | Wire diameter ±0.05 mm; free length ±0.5 mm; leg angle ±1°; coil diameter ±0.2 mm |
| Surface finish | Plain, zinc plated (clear or yellow), nickel plated, powder coated, black oxide |
| Ends | Closed, open, ground, short hook, long hook, special bends per drawing |
| Batch size | 1 piece to 1,000,000 pieces. No MOQ for prototypes. |
| Inspection | Load testing (force at specified deflection), dimensional CMM check, hardness test (HRC), surface defect check |
| Documentation | Material certificate (EN 10204 3.1), batch traceability code, inspection report per batch |
1. Batch-traceable quality. Every coil of wire we use carries a heat number. We record it against your batch number. If a problem appears in your assembly line six months from now, we trace it back to the exact material and machine settings. No guesswork.
2. Inspection report per batch. You do not have to ask. Every shipment includes a report with measured values: wire diameter, free length, load at deflection, and surface condition. Our QC team uses calibrated digital force testers and optical comparators. We sign it. You trust it.
3. One factory for CNC + stamping + spring + heat sink. Your torsion spring often sits next to a stamped bracket or a CNC-machined shaft. If we make all of them, tolerances match. Lead times shrink because parts travel between machines, not between countries. You deal with one engineer, not four.
Custom steel torsion springs are not off-the-shelf items. They are engineered for a specific load and space envelope. Typical applications from our current orders:
If your part needs to store energy and release it at a precise angle, a torsion spring is the answer. We make it to your drawing, not to a catalog.
Looking for a different part? We also machine Custom Double Coil Torsion Springs | Precision Manufacturing China in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We make one prototype for your testing or one million for production. Tooling is minimal for springs—we set up the coiling machine from your wire diameter and spring index. Prototype lead time is 7 days.
Q: How do you guarantee tolerance and quality? A: We start with the material certificate. Then we set the coiling machine to your wire diameter and measure the first piece. After stress-relieving, we test load at your specified deflection. Every batch gets a final dimensional check on a CMM. The inspection report goes out with the shipment.
Q: What is your lead time for production? A: Prototypes: 7-15 days. Production orders: 15-25 days depending on quantity and surface finish. For urgent needs, tell us your deadline. We run three shifts and can split your order across two spring lines.
Q: Do you provide material certificates? A: Yes. Every batch ships with a material certificate per EN 10204 3.1. If you need a specific standard—ASTM, DIN, JIS—we source the wire accordingly and document it.
Stop searching for a generic spring. Send us your print, your CAD file, or even a hand sketch with dimensions. We will respond with a firm quote in 12 hours.
Include your wire diameter, number of coils, leg configuration, and required load. If you are unsure about the design, our engineers will suggest adjustments for manufacturability—at no cost. Precision manufacturing, made in China, no MOQ. Your drawing is the starting point.
| 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 |
