OpeningYour drawing defines the spring. We build it exactly to that print. Double coil torsion springs carry load in two parallel legs, which means tighter angular control and higher torque in a compa
Your drawing defines the spring. We build it exactly to that print. Double coil torsion springs carry load in two parallel legs, which means tighter angular control and higher torque in a compact space. That geometry demands precision. We deliver it.
Every unit is verified before shipment. We check coil diameter, leg position, free angle, and load at deflection. If it does not match your tolerance, it does not leave the factory.
| Parameter | Value | Notes |
|---|---|---|
| Wire diameter | 0.1 mm – 12 mm | Round, square, or rectangular wire |
| Coil diameter (OD) | 1.0 mm – 80 mm | Tolerance ±0.05 mm |
| Number of coils | 2 – 20 | Custom per drawing |
| Leg length | 2 mm – 150 mm | Straight, bent, or hooked ends |
| Leg angle (free position) | 0° – 360° | Tolerance ±1° |
| Torque range | 0.01 N·m – 50 N·m | Verified on test fixture |
| Materials | Music wire, stainless steel 302/304/316, 17-7PH, Inconel, phosphor bronze | Other alloys on request |
| Surface finish | Zinc plating, nickel plating, electropolishing, black oxide, passivation | Per ASTM B633, AMS 2418 |
| Production process | CNC coiling, automatic heat treating, shot peening, grinding | 3D CNC coiling for complex geometries |
| Batch size | 1 – 500,000 pcs | No MOQ, batch traceability |
| Inspection | 100% dimensional check on critical features, load testing per batch | CMM and optical comparator |
1. Batch-traceable quality Each batch gets a unique job number. We record wire lot, heat treat cycle, and final inspection data. If a problem appears in your assembly line, we trace it back to the exact coil and operator. That is precision manufacturing you can audit.
2. Inspection report per batch You do not have to guess if the springs meet spec. Every shipment includes a dimensional report, load test data, and material certificate. We measure free angle, coil gap, and torque at your specified deflection. If you need PPAP Level 3, we provide it.
3. One factory for CNC, stamping, springs, and heat sinks Your torsion spring might need a stamped bracket, a CNC-machined shaft, or a heat sink for a high-temp application. We do all four in-house. One drawing package, one quality system, one shipping point. Fewer vendors, fewer delays, fewer excuses.
Double coil torsion springs handle higher loads than single coil versions without increasing wire diameter. That makes them the default choice in demanding mechanical systems.
Looking for a different part? We also machine Custom Springs Made to Print | Precision Manufacturing, No MOQ | BQUQ in the same Dongguan factory.
Q: Is there really no MOQ? A: Yes. We run prototypes from 1 piece. For production, we batch efficiently to keep your unit cost low, but we never turn down a small order. Many customers start with 50 pieces for field testing, then scale to 50,000.
Q: How do you guarantee tolerance and quality? A: We use CNC coiling machines with closed-loop feedback. After coiling, we heat treat and stress relieve. Then we measure every critical dimension on an optical comparator or CMM. Load testing is done on a calibrated torque tester. The inspection report is included with your shipment.
Q: What is the lead time for custom springs? A: Prototypes ship in 7–12 days after drawing approval. Production runs take 15–20 days, depending on quantity and surface finish. We offer expedited service for urgent projects—just ask.
Q: Can you provide material certificates? A: Yes. We supply EN 10270-1, ASTM A228, and ASTM A313 certificates with every batch. For aerospace or medical, we add full traceability documentation and can perform third-party testing if your spec requires it.
Stop waiting on generic catalog springs. Send us your drawing, and get a firm quote in 12 hours. We will review the geometry, suggest material options if needed, and confirm lead time. No MOQ, no hidden fees, no surprises.
Email: sc@bquq.com WhatsApp: +86 13713157787
Precision manufacturing, made in China, with 20 years of spring experience behind every coil. Your drawing is the only thing we need to start.
| 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 |
