## Opening
This collection is not a stock catalog. It is a reference set of spring geometries we have produced in the last 12 months. You send the drawing. We make the spring.Every part is manufactu
This collection is not a stock catalog. It is a reference set of spring geometries we have produced in the last 12 months. You send the drawing. We make the spring.
Every part is manufactured to your specified tolerances, verified with a 3D coordinate measuring machine before shipment. No exceptions.
| Parameter | Value |
|---|---|
| Spring types | Compression, extension, torsion, conical, double torsion, wave |
| Wire diameter range | 0.05 mm – 12.0 mm |
| Free length range | 1.0 mm – 300 mm |
| Max outer diameter | 80 mm |
| Materials | Spring steel (EN 10270-1), stainless steel (302, 304, 316, 17-7PH), music wire, phosphor bronze, beryllium copper |
| Coiling machines | CNC 5-axis spring coilers (Wafios, MEC) for wire ≤ 6 mm; CNC lathe for wire > 6 mm |
| Grinding | End grinding for compression springs, flatness ≤ 0.05 mm |
| Surface treatment | Zinc plating, nickel plating, electropolishing, passivation, black oxide, shot peening |
| Tolerance class | DIN 2095 grade 1 (precision) or grade 2 (commercial) – specify on drawing |
| Inspection | 100% dimensional check on critical features; load testing at 20%, 50%, 100% of working load |
| Batch traceability | Heat number and production batch code laser-marked on packaging label |
2. Inspection report per batch You receive a full inspection report with each shipment. It includes dimensional measurements, material hardness, surface finish, and load-deflection curves. The report is signed by our QC engineer and stamped with our factory seal. No extra charge.
3. One factory for CNC + stamping + spring + heatsink Your assembly likely needs more than just springs. We run CNC machining, metal stamping, and heatsink production lines under the same roof. Send us your full BOM. We coordinate all parts in one place, reducing your supplier management time and shipping costs.
Custom springs from this collection go into demanding applications where failure is not an option.
If your application is not listed, call us. We have designed springs for everything from vending machines to nuclear power plant actuators.
Q: How do you ensure tolerance and quality? A: We use CNC coilers with closed-loop feedback. Every spring is measured on a digital caliper or CMM. For load-critical springs, we test each piece on a force tester. A batch inspection report is sent with your shipment.
Q: What is your lead time? A: Prototypes in 7–12 working days after drawing approval. Production orders in 15–20 working days. For urgent needs, we offer a 48-hour express prototype service at a 30% surcharge.
Q: Can you provide material certificates? A: Yes. Every batch comes with EN 10204 3.1 material certificates. We also provide heat treatment reports and surface coating thickness certificates on request.
We respond with a firm quote within 12 hours. No vague estimates. You get unit price, tooling cost (if any), lead time, and delivery terms.
Email your PDF or STEP file to sc@bquq.com WhatsApp for quick questions: +86 13713157787
Precision manufacturing is our only business. Custom springs are our core product. Send the drawing. We will handle the rest.
Looking for a different part? We also machine Custom Helical Spring Antenna Coils | Precision Manufacturing Made in China in the same Dongguan factory.
| 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 |
