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When a project demands consistent return force and long-term dimensional stability, undersized or mismatched springs cause frustrating failures. Engineers, hobbyists, and repair technicians who need a compact, corrosion-resistant compression spring in a precise wire diameter will find this 1.2mm wire series covers an exceptionally wide range of outer diameters and free lengths in a single listing.
Each spring is wound from stainless steel wire with a nominal wire diameter of 1.2mm (approximately 0.047 in). Outer diameters span 6mm–20mm (roughly 0.24 in–0.79 in) and free lengths range from 10mm to 100mm (approximately 0.39 in–3.94 in), with quantities per pack ranging from 2 pcs to 10 pcs depending on the selected variant. The closed, ground-end coil geometry provides flat seating surfaces for stable axial loading.
Typical applications include electronic device button return mechanisms, small appliance valve assemblies, precision instrument suspension systems, 3D printer extruder tensioners, and RC model suspension tuning — all scenarios where a compact stainless steel compression coil spring with a defined 1.2mm wire diameter delivers repeatable performance.
| Wire Diameter | 1.2mm (approx. 0.047 in) |
|---|---|
| Outer Diameter | 6mm – 20mm (approx. 0.24 in – 0.79 in) — See variant options |
| Free Length | 10mm – 100mm (approx. 0.39 in – 3.94 in) — See variant options |
| Material | Stainless Steel |
| End Type | Closed Ground Ends |
| Coil Direction | Right-hand wound (standard) |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
| Surface Finish | Bright / Natural Stainless |
| Pack Quantity | 2 pcs / 5 pcs / 10 pcs — See variant options |
Measure the bore or housing your spring will sit inside, then select an outer diameter 0.5mm–1mm smaller than the bore for a sliding fit. If the spring rides on a guide rod, the inner diameter (outer diameter minus twice the wire diameter, approximately OD − 2.4mm) should clear the rod with at least 0.3mm–0.5mm of radial clearance.
Free length is the unloaded length of the spring. You need a free length longer than your required working length by at least the amount of deflection your application demands. As a starting point, select a free length roughly 20–30% longer than the compressed working length to keep the spring within its elastic range and avoid coil bind.
With a 1.2mm wire diameter, these are light-duty to medium-duty springs suited for return mechanisms, tensioners, valve closures, and similar low-to-moderate force applications. For heavy industrial clamping or high-cycle fatigue environments, a larger wire diameter is recommended. If you need specific spring rate or load data for a variant, please contact us to confirm.
Stainless steel offers significantly better corrosion resistance than carbon steel or music wire springs. These springs are suitable for humid environments, occasional water exposure, and mild chemical contact. For prolonged immersion in saltwater or aggressive acids, additional protective measures or a higher-grade alloy may be needed.
Yes. The stainless steel construction makes these compression springs a practical choice for outdoor mechanisms, garden equipment, marine accessories, and other applications where moisture is present. Avoid prolonged contact with chlorinated water or strong oxidizing agents to maintain surface integrity over time.
Shorter lengths (10mm–50mm) are available in 10-piece packs, which suits prototyping, repair kits, or small production runs. Longer lengths (60mm–100mm) come in 5-piece or 2-piece packs reflecting the higher material content per spring. Order the quantity that covers your immediate need plus a few spares to avoid project delays.
Yes. The 6mm–10mm outer diameter variants in 10mm–30mm free lengths are commonly used in FDM 3D printer bed leveling, extruder tensioners, and RC suspension setups. Match the outer diameter to your spring pocket and the free length to your required preload travel for best results.
