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 shipme
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
Get a Fast Quote for This Part
Send us your drawing / quantity / material — reply within 24h.
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.
Tolerance: ±1° on angular position, ±0.05 mm on leg length
Lead time: 7–12 days for prototypes, 15–20 days for production runs
No MOQ: order 1 piece or 100,000 pieces
Material: copper, phosphor bronze, beryllium copper, or your specified alloy
Verification: 100% dimensional check on critical features before packing
Specifications
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
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.
Three Reasons Buyers Send Us Their Drawings
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.
Where These Parts Are Used
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.
Automotive seat belt buckles – the spring returns the release button and keeps the latch engaged under vibration
Laptop hinge assemblies – small copper springs provide counterbalance torque for lid opening
Medical device clamps – torsion springs hold force on tubing or instrument handles in single-use tools
Electrical switchgear – copper springs carry current in addition to providing torque, so the material choice matters
Camera gimbals and drone actuators – precision leg angles keep the mechanism balanced
Industrial safety interlocks – springs must fail predictably, so material certs and heat treatment records are critical
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.
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).
Send Your Drawing
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.
