OpeningSend us your drawing for a copper buckle shaft torsion spring. We build it to your exact geometry, wire diameter, and load requirements. Every coil is verified before shipment. No guesswork.We
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OpeningSend us your drawing for a copper buckle shaft torsion spring. We build it to your exact geometry, wire diameter, and load requirements. Every coil is verified before shipment. No guesswork.We
Send us your drawing for a copper buckle shaft torsion spring. We build it to your exact geometry, wire diameter, and load requirements. Every coil is verified before shipment. No guesswork.
We run a 20-year-old factory in Dongguan, China. Our lines handle CNC machining, metal stamping, springs, and heat sinks under one roof. For torsion springs, we hold tight tolerances on leg position and free angle.
| Parameter | Value |
|---|---|
| Wire diameter | 0.1 mm – 12.0 mm |
| Coil diameter (outer) | 1.0 mm – 80.0 mm |
| Total coils | 2 – 50 turns |
| Free angle tolerance | ±1° (standard), ±0.5° (precision) |
| Leg length tolerance | ±0.05 mm |
| Leg configuration | Straight, bent, hooked, or custom form per drawing |
| Surface finish | Zinc plating, nickel plating, passivation, or bare copper |
| Material options | Copper (C1100, C17200), phosphor bronze (C5210), stainless steel 302/316 |
| Machines | CNC coiling machines (0.1–12 mm wire), automatic torsion winders, 4-axis CNC leg forming |
| Process | Coiling → heat treatment (stress relief) → leg forming → surface finishing → 100% inspection |
| Batch traceability | Heat number and machine log recorded per batch |
| Inspection report | Dimensional report, load test data, material cert included with every shipment |
We use CNC coiling for consistent pitch and diameter. Heat treatment removes residual stress so your spring holds its free angle over time. Leg forming is done on a separate CNC station to keep angular accuracy.
1. Batch-traceable quality Every batch gets a unique job number. We record the wire lot, machine settings, and operator. If a problem appears in your assembly line, we trace it back to the exact coil and hour it was made. You get full accountability, not excuses.
2. Inspection report per batch You receive a dimensional report with measured values for wire diameter, coil OD, free angle, and leg position. Load testing is done on a calibrated torsion tester. The report is signed by our QC lead and shipped with your parts. No extra charge.
3. One factory for CNC + stamping + spring + heat sink Your buckle shaft assembly may need a machined shaft, a stamped bracket, and a heat sink. We make all of them in-house. You deal with one engineering team, one quality system, one logistics point. This cuts your supplier management time and reduces tolerance stack-up between parts.
Copper buckle shaft torsion springs are not a commodity item. They appear in mechanisms where a shaft rotates and needs a return force with minimal play.
If your part uses a torsion spring around a shaft, we have likely built a similar geometry. Send the drawing and we will confirm feasibility within hours.
Looking for a different part? We also machine Stainless Steel Touch Spring Collection | Custom Springs Made in China in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We run prototypes from 1 piece. Production runs from 100 pieces are welcome. Tooling is minimal for springs, so small batches are cost-effective.
Q: How do you control tolerance and quality? A: CNC coiling holds wire diameter and coil pitch within ±0.02 mm. Free angle is checked on a digital protractor. Load is tested at specified deflection angles. We provide a full inspection report per batch. If we miss a dimension, we remake the batch at our cost.
Q: What is your lead time? A: Prototypes ship in 7–12 days after drawing approval. Production runs take 15–20 days. For urgent orders, we can split the batch and airfreight the first 20% within 5 days. We will quote the split at no extra engineering cost.
Q: Can you provide material certificates? A: Yes. We supply mill certificates for copper and bronze alloys, including chemical composition and hardness. For medical or automotive applications, we can add full traceability documentation. Just specify the standard you need (ASTM, EN, or JIS).
Email your PDF or STEP file to sc@bquq.com. Include wire diameter, coil OD, total coils, leg lengths, and required torque if known. We reply with a firm quote within 12 hours.
Prefer chat? WhatsApp us at +86 13713157787. We answer technical questions directly—no sales scripts.
Precision manufacturing, made in China, no MOQ. 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 |
