OpeningYour drawing defines the spring. We build exactly that.Every spring is made to your print—wire diameter, free length, total coils, load at deflection, and end type. We verify each dimension bef
Your drawing defines the spring. We build exactly that.
Every spring is made to your print—wire diameter, free length, total coils, load at deflection, and end type. We verify each dimension before shipment. No guesswork.
We are a precision manufacturing factory in Dongguan, China, with 20 years on CNC machining, metal stamping, springs, and heat sinks. One shop floor, one quality system, one invoice.
| Parameter | Value |
|---|---|
| Materials | SUS 302, 304, 316L, 17-7PH, Inconel X-750 (per your spec) |
| Wire diameter | 0.1 mm – 12.0 mm |
| Outer diameter | 1.0 mm – 120 mm |
| Free length | 2 mm – 300 mm |
| End types | Closed & ground, closed & not ground, plain ends, pigtail |
| Coiling process | CNC coiling (0.1–5.0 mm wire), hot coiling (5.0–12.0 mm wire) |
| Tolerance | DIN 2095 grade 2 standard; grade 1 available on request |
| Surface finish | As-coiled, passivated, electropolished, shot-peened, zinc or nickel plated |
| Testing | Load testing at specified deflection, free length check, OD/ID gauge inspection |
| Batch control | Heat number traceability, batch number stamped on each box |
| Packaging | Anti-rust paper, individual poly bags, export cartons |
All springs are stress-relieved after coiling. Shot peening is optional but recommended for cyclic loads above 10⁷ cycles. We set load at 20% of solid height per standard practice.
1. Batch-traceable quality. Each batch gets a unique number. That number links to material heat, coiling machine, operator, and inspection records. If a part fails in your assembly, we can trace it back to the exact wire lot in minutes. This is not typical for most spring shops in China.
2. Inspection report per batch. You receive a dimensional report with every shipment. It lists OD, ID, free length, solid height, and load at specified deflection for sampled pieces. We also include material certs and hardness test results. No extra charge.
3. One factory for CNC + stamping + spring + heat sink. Your assembly may need a stamped bracket, a CNC-machined housing, and a spring. We make all of them under one roof. You get one purchase order, one quality contact, and one shipping date. Fewer suppliers means fewer delays and less finger-pointing.
Custom stainless steel compression springs are not commodity parts. They go into demanding assemblies.
If your spring fails, your product stops. That is why we treat tolerance and material certs as non-negotiable.
Looking for a different part? We also machine Custom Double Torsion Springs Made in China | No MOQ Precision Coils in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We coil one prototype for you to test, then scale to 500,000 pieces. Tooling is CNC-based, so setup cost is the same for one or one thousand.
Q: How do you control tolerance and quality? A: We follow DIN 2095 grade 2 as the default. For tighter needs, we use grade 1 with 100% inspection on critical dimensions. Load testing is done on a digital force tester calibrated annually. Every batch gets a report.
Q: What is the lead time for custom springs? A: Prototypes ship in 7–12 working days after drawing approval. Production runs take 15–20 working days. For urgent orders, we can split delivery—ship what is ready first, then the balance.
Q: Can you provide material certificates? A: Yes. EN 10204 3.1 mill certificates come with every batch, at no extra cost. We also provide heat treatment records and surface finish reports on request.
Email your PDF or STEP file. We reply with a firm quote in 12 hours.
Include wire diameter, outer diameter, free length, number of active coils, end type, and required load at deflection. If you only have a sample part, send it by courier—we will reverse-engineer and quote.
Email: sc@bquq.com WhatsApp: +86 13713157787
Precision manufacturing, made in China, with no MOQ and full traceability. Your drawing is the contract. We build to it.
| 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 |
