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Your battery contact spring starts as a drawing. We turn it into a finished part with a tolerance of ±0.01 mm on critical dimensions. Every spring is verified before shipment—dimensional
Your battery contact spring starts as a drawing. We turn it into a finished part with a tolerance of ±0.01 mm on critical dimensions. Every spring is verified before shipment—dimensional check, load test, and surface inspection. No exceptions.
We are a precision manufacturing factory in Dongguan, China, with 20 years of spring-making experience. Your drawing is the only thing we need to start.
| Parameter | Value |
|---|---|
| Wire diameter | 0.05 mm – 8.0 mm |
| Spring outer diameter | 0.5 mm – 80 mm |
| Free length | 0.5 mm – 200 mm |
| Tolerance (wire dia.) | ±0.005 mm (for ≤0.5 mm), ±0.01 mm (for >0.5 mm) |
| Tolerance (free length) | ±0.1 mm (for ≤10 mm), ±0.2 mm (for >10 mm) |
| Load tolerance | ±5% at specified deflection |
| Surface finish | Zinc plating, nickel plating, gold plating, passivation, or as-drawn |
| Materials | SUS301, SUS304, SUS316, SK5, 65Mn, C17200 beryllium copper, C5210 phosphor bronze |
| Coiling machines | CNC 8-axis spring coiler (max wire dia. 8 mm), 4-axis coiler (max wire dia. 2 mm) |
| Secondary processes | Grinding, deburring, heat treatment, shot peening, forming |
| Inspection equipment | 2D projector, load tester, digital micrometer, salt spray tester |
| Batch size | 1 – 5,000,000 pieces |
| Packaging | Anti-rust paper, plastic reel, vacuum bag, or custom per your spec |
All springs are made from certified raw material. We keep batch records for 3 years.
2. Inspection report per batch. You get a full dimensional report with every shipment. It includes wire diameter, free length, load at deflection, and surface condition. No extra charge. We also send photos of the actual parts under the 2D projector if you ask.
3. One factory for CNC + stamping + springs + heat sinks. Your battery contact spring often sits next to a stamped bracket or a CNC-machined housing. We make all of them under one roof. Fewer suppliers, faster lead time, and no tolerance mismatch between mating parts.
Battery contact springs are small but critical. They carry current and maintain pressure in demanding environments.
In every case, the spring’s contact force determines reliability. A loose spring causes intermittent power loss. Ours hold their load within ±5% over 10,000 cycles.
Q: How do you control tolerance and quality? A: We use CNC coiling machines with closed-loop wire feed control. Every batch is sampled per AQL 2.5 (ISO 2859-1). Critical dimensions are checked on a 2D projector. We send the inspection report with your shipment.
Q: What is the lead time? A: Prototypes: 5–7 working days from drawing approval. Production: 10–15 working days for standard materials. If you need faster, we can expedite for an additional 20% surcharge.
Q: Do you provide material certificates? A: Yes. Every batch comes with a mill certificate for the raw wire. We also provide RoHS and REACH compliance documents on request. For medical or automotive, we add IATF 16949 PPAP documents.
Send us your 2D or 3D drawing. We will review it for manufacturability and send a firm quote within 12 hours. Include material, load requirements, and surface finish if you have them. If not, we will recommend the best option.
Email: sc@bquq.com WhatsApp: +86 13713157787
We are a precision manufacturing factory made in China, and we ship worldwide. No MOQ, no hidden fees, no surprises. Just a spring that fits your drawing exactly.
Looking for a different part? We also machine Custom Stainless Steel Compression Springs | Precision Manufacturing No MOQ 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 |
