This is the Copper Helical Antenna Spring Collection from BQUQ — a family of precision-machined, copper-based helical coils engineered for RF antennas, 5G modules, and IoT devices. You get a consisten
This is the Copper Helical Antenna Spring Collection from BQUQ — a family of precision-machined, copper-based helical coils engineered for RF antennas, 5G modules, and IoT devices. You get a consistent pitch accuracy of ±0.01 mm, a surface finish of Ra 0.4, and a hardness range of 80–100 HRB (for copper alloys), all delivered in as fast as 15 days from drawing approval.
Antenna springs are not mechanical parts — they are electrical circuits in coil form. A pitch error of 0.05 mm shifts the resonant frequency by several MHz. Our CNC coiling machines hold pitch tolerance at ±0.01 mm and total runout under 0.05 mm per 10 turns. The Ra 0.4 finish reduces skin-effect losses at 2.4 GHz and above. This is precision manufacturing, not stamping.
We stock six copper alloys. C11000 (ETP copper) for maximum conductivity (101% IACS). C17200 (beryllium copper) for spring-back and fatigue life — heat-treated to 38–42 HRC. C52100 (phosphor bronze) for corrosion resistance in marine antennas. C36000 (free-cutting brass) for threaded bases. C10200 (oxygen-free) for low-loss RF. C14500 (tellurium copper) for high-speed machining. We also offer silver-plated copper (5 µm) for surface conductivity up to 105% IACS.
Long helical springs (over 20 mm length) tend to bow sideways. Our CNC spring machines use a mandrel-guided coiling process — wire is wrapped around a precision-ground carbide mandrel with a runout of 0.003 mm. After coiling, each spring is stress-relieved in a vacuum oven at 250°C for 30 minutes. This removes internal stresses that cause later distortion. We measure coil OD with a laser micrometer at five points along the length. The max deviation is 0.02 mm from nominal OD.
Every spring in your order is checked, not just one per batch. We use a 2D optical comparator for pitch and wire diameter. A digital force gauge tests spring rate at 20%, 50%, and 80% of deflection. A Vickers hardness tester verifies HRC on beryllium copper. An LCR meter measures inductance at 100 MHz. A salt-spray test is performed on plated samples. We issue a full dimensional report with each shipment.
| Specification | Value / Range |
|---|---|
| Wire diameter | 0.2 mm – 5.0 mm |
| Coil OD | 2.0 mm – 50 mm |
| Free length | 3 mm – 200 mm |
| Pitch tolerance | ±0.01 mm |
| Total runout (per 10 turns) | ≤ 0.05 mm |
| Surface finish | Ra 0.4 µm (as-coiled) / Ra 0.2 µm (polished) |
| Hardness (C17200 BeCu) | 38 – 42 HRC |
| Hardness (C11000 Cu) | 80 – 90 HRB |
| Inductance tolerance | ±2% at 100 MHz |
| Lead time (after drawing approval) | 15 days (prototype), 25 days (production) |
| MOQ | No MOQ — order 1 piece or 100,000 |
RF engineers often need to change wire diameter or pitch after the first resonance test. We give you a prototype in 5 days. You test it on your network analyzer. You send us the S11 plot. We adjust the spring geometry in our CNC program — no new tooling needed for most changes. Your second prototype is free if the change is within the same wire diameter. This is how we speed up your product cycle.
Stamped copper springs have burrs and micro-cracks that create parasitic capacitance. Formed springs (bent wire) have inconsistent pitch because they rely on manual setup. Our CNC-coiled springs have a smooth, continuous grain flow — no stress risers. At 5 GHz, a burr of 0.05 mm can cause a 5% impedance mismatch. Our process eliminates this. If you are designing for 5G mmWave or satellite links, this is the difference between a working antenna and a paperweight.
We offer four finishes. Bare copper (Ra 0.4) — for solder connection, oxidizes slightly. Silver plating (5 µm) — improves conductivity and solderability, best for high-power RF. Nickel plating (3 µm) — for corrosion resistance in outdoor enclosures. Gold plating (0.5 µm) — for low intermodulation distortion in base station filters. We apply plating after coiling to avoid cracking the coating. Each plated batch is tested with a 24-hour humidity soak.
We have no MOQ — you can order a single prototype spring or a full production run of 100,000 pieces, and the unit price scales accordingly.
Yes — every dimension on the drawing is fully custom, and we can adjust any parameter (wire type, turns, pitch, plating) within 48 hours for prototyping.
We use 100% optical inspection for pitch and OD on every piece, plus SPC monitoring on hardness and inductance for each batch of 500 units.
Production of 10,000 pieces takes 18–20 working days after drawing approval, including plating and full inspection — no hidden delays.
Before you finalize your spring design, review our CNC cutting tool selection guide for wire material choices and our CNC machining tolerances guide for stack-up analysis. These resources explain how our tolerances interact with your mating parts.
We are a precision manufacturing factory in Dongguan, China, with 20 years of CNC and spring experience. Made in China does not mean compromise — our springs are used in medical telemetry and aerospace RF modules.
Get a firm quote within 12 hours. Send your drawing to sc@bquq.com or WhatsApp +86 13713157787. We will return a DFM review and a price per piece at your required quantity — no MOQ, no obligation.
| 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 |
