This is the Special Shaped Wire Form Spring Collection from BQUQ, a factory in Dongguan, China with 20 years of CNC machining, stamping, and spring production experience. These are not standard off-th
This is the Special Shaped Wire Form Spring Collection from BQUQ, a factory in Dongguan, China with 20 years of CNC machining, stamping, and spring production experience. These are not standard off-the-shelf coils; they are custom wire forms bent, stamped, or CNC-shaped to your exact print, delivering tolerances of ±0.02 mm on critical forming dimensions and a hardness range of 42–48 HRC after heat treatment. You get a prototype in 5 days and production parts in 7–10 days, all verified with a 100% dimensional inspection report before shipment.
Most shops struggle with wire forms that have multiple bends, closed hooks, or irregular pitches. We do not. Our CNC wire forming machines handle wire diameters from 0.1 mm to 12 mm, allowing for tight radii down to 0.5 mm and bend angles held to ±0.5 degrees. For shapes that require a stamping operation—like flat lugs or pierced ends—we use progressive dies with a positional accuracy of ±0.01 mm. This hybrid approach (CNC bending + stamping + CNC machining) means we can produce a single spring that combines a conical section, a torsion arm, and a flat mounting plate, all in one piece, without secondary welding or assembly.
We start with spring steel wire per ASTM A228 (music wire), ASTM A313 (stainless 302/304), and ASTM A401 (chrome silicon), plus beryllium copper for non-magnetic or conductive applications. After forming, we heat-treat in a controlled atmosphere furnace to prevent decarburization. For music wire, we achieve a hardness of 45–48 HRC; for chrome silicon, 46–50 HRC. We also offer a stress-relief bake at 180–230°C for 30 minutes after forming to remove residual stress, which improves fatigue life by up to 30% in cyclic loading tests. If you need a passivated or zinc-nickel plated surface, we do that in-house too, with a coating thickness of 8–12 microns.
Every single Special Shaped Wire Form Spring Collection part goes through a 2-stage inspection. First, a CMM (coordinate measuring machine) checks the wire form's 3D geometry—pitch, free length, hook angles, and perpendicularity—against your CAD model, with a measurement uncertainty of ±0.005 mm. Second, an optical comparator at 10x–50x magnification verifies the surface finish and edge condition, catching any burrs or micro-cracks from the forming process. We include a full dimensional report (PDF) with every shipment, showing actual measured values vs. your tolerances. If a part fails, it is scrapped, not reworked, because reworking a wire form often changes its spring rate.
| Specification | Value / Range |
|---|---|
| Wire diameter | 0.1 mm – 12 mm |
| Materials | ASTM A228, A313 (302/304), A401, Beryllium Copper |
| Hardness (after heat treat) | 42–50 HRC depending on material |
| Forming tolerance (critical dims) | ±0.02 mm |
| Bend angle tolerance | ±0.5 degrees |
| Surface finish | Ra 0.8 µm (ground), Ra 1.6 µm (as-formed) |
| Runout (concentricity) | ≤ 0.05 mm for OD references |
| Lead time (prototype) | 5 working days |
| Lead time (production) | 7–10 working days |
| MOQ | No MOQ (1 piece accepted) |
Stamped springs often fracture at the shear edge because of micro-tears. Our forming process bends the wire, which aligns the grain flow along the bend radius, increasing fatigue strength by 25% compared to stamped parts of the same material. For a spring that cycles 10,000 times per day, that means an extra 2,500 cycles before failure. We also radius all internal corners to 0.5 mm minimum, eliminating stress risers. If your application involves high-speed compression (over 100 Hz), we recommend our chrome silicon option, which has a higher yield strength and better relaxation resistance at temperatures up to 150°C.
If your order includes multiple wire form shapes for a single assembly, we do not mix them. Each part number is bagged and labeled with a barcode that links to its heat number, material lot, and inspection report. This is critical for medical, automotive, and aerospace applications where you need full traceability of each spring to its raw material batch. We use anti-corrosion VCI paper for long-term storage, and for overseas shipments, we pack in telescopic cartons with foam inserts to prevent deformation during transit. You will never receive a bent or tangled spring because we vacuum-seal each set.
Send us a PDF, STEP, or IGES file with the following: wire diameter, outer diameter (OD) or inner diameter (ID), free length, total coils, active coils, end type (closed, ground, plain), and the load at a specific deflection if you have it. If you are missing any of these, we can reverse-engineer a sample you mail us. Our engineers will review your design within 2 hours and flag any forming issues—like a bend radius smaller than the wire diameter—before quoting. We will also suggest a cheaper alternative if your tolerance of ±0.01 mm is overkill for a non-critical dimension. This is part of our precision manufacturing service, not an upsell.
We use a 3-2-1 sampling plan (AQL 0.65) for production runs. That means for a batch of 10,000 pieces, we inspect a random sample of 80 parts; if more than 1 part is out of spec, the entire lot is quarantined and 100% inspected. We also test spring rate (N/mm) on a universal testing machine with a load cell accuracy of ±0.5%. For high-volume orders, we use an automated sorting machine that checks free length and load at a specified height, rejecting parts that fall outside your tolerance band. This is not a one-time check; we do it at the start of the shift, after lunch break, and at the end of the shift—three times per day.
We have no MOQ—we accept a single prototype piece for testing, and production pricing kicks in at 500 pieces.
Yes, the Special Shaped Wire Form Spring Collection includes all non-coil shapes—clips, retaining rings, U-bends, and multi-plane brackets—as long as they are made from spring wire.
We use CNC servo-driven forming heads that position to a resolution of 0.001 mm, and we measure the final part on a CMM, not a caliper, so the tolerance is verified in 3D space.
For a simple wire form with no heat treatment, we can ship within 48 hours; for a complex shaped spring with heat treatment and a CMM report, it is 5 working days.
Stop guessing if your spring design is manufacturable. Send us your 2D or 3D drawing, and we will return a firm quote—price per piece, tooling cost (if any), and lead time—within 12 business hours. We will also include DFM feedback on your tolerance callouts, referencing our CNC cutting tool selection guide and our CNC machining tolerances guide for context. Email your drawing to sc@bquq.com or WhatsApp us at +86 13713157787. We are a precision manufacturing partner, made in China, ready to ship globally—no MOQ, no minimum order fee.
| 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 |
