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When a repair stalls because you can't find a spring that fits, the whole project grinds to a halt. Whether you're a hobbyist rebuilding a mechanism, a technician servicing equipment, or an engineer prototyping a new assembly, having the right compression spring on hand makes the difference between a finished job and a frustrating delay. These stainless steel compression springs are stocked in a wide matrix of wire diameters, outer diameters, and free lengths so you can match the exact specification your application demands.
Each spring is formed from stainless steel wire in three wire diameter options — 0.2 mm, 0.3 mm, and 0.4 mm — with outer diameters ranging from 1.5 mm to 12 mm (approximately 0.06 in to 0.47 in) and free lengths spanning 5 mm to 305 mm (approximately 0.20 in to 12.0 in). Pack quantities range from 1 to 20 pieces per order, letting you buy exactly what you need for a single repair or stock a small assortment for ongoing work.
Typical use cases include replacing worn compression springs in pen mechanisms and small consumer electronics, sourcing precise springs for RC model suspension and robotics joints, and specifying corrosion-resistant springs for outdoor or humid-environment assemblies where carbon steel would rust prematurely.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 0.2 mm / 0.3 mm / 0.4 mm |
| Outer Diameter (OD) | 1.5 mm – 12 mm (approx. 0.06 in – 0.47 in) |
| Free Length | 5 mm – 305 mm (approx. 0.20 in – 12.0 in) |
| Pack Quantity | 1 / 3 / 5 / 10 / 20 pcs (varies by variant) |
| Spring Type | Compression (open-coil, axial load) |
| Finish | Natural stainless (uncoated) |
| Spring Rate | See variant options |
| End Type | See variant options |
| Inner Diameter (ID) | See variant options |
Wire diameter directly affects the spring's stiffness (spring rate) and load capacity. A thinner wire (0.2 mm) produces a softer, lighter spring suitable for delicate mechanisms like pen clips or small switches. A thicker wire (0.4 mm) produces a stiffer spring capable of handling higher loads in robotics joints or valve returns. Match the wire diameter to the force range your application requires, and verify the outer diameter fits within your housing bore.
Outer diameter (OD) is the measurement across the outside of the coils; inner diameter (ID) is the bore through the center of the spring. If your spring fits over a rod or pin, measure the rod and select a spring whose ID is slightly larger than the rod. If your spring fits inside a bore or housing, measure the bore and select a spring whose OD is slightly smaller. The OD is listed in the variant selector for these springs.
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 light outdoor use. For continuous immersion in saltwater or aggressive chemical environments, consult a materials engineer to confirm suitability. For typical DIY, electronics, and light mechanical applications in variable humidity, stainless steel is a reliable choice.
Free length is the overall length of the spring when it is not compressed or stretched — simply the natural resting length. Measure the space available in your assembly when the spring is fully unloaded, then select a free length equal to or slightly longer than that space (the spring will compress to fit). If you are replacing a worn spring, measure the original spring's free length before installation.
Yes. The small wire diameters (0.2 mm and 0.3 mm) and compact outer diameters (starting at 1.5 mm) make these springs well-suited for use in battery contacts, push-button switches, connector pins, and other PCB-level mechanisms. Stainless steel also provides adequate electrical conductivity for low-current contact applications, though it is not optimized for high-conductivity use cases.
For a single repair or prototype, the pack of 1 or 3 is the most economical choice. If you are servicing multiple units of the same product or want spares on hand, packs of 5 or 10 offer a better per-unit value. For production runs or workshop stocking, the pack of 20 provides the lowest per-piece cost. Select the pack size that matches your expected usage volume to avoid over-ordering.
Spring rate (force per unit of deflection, typically expressed in N/mm or lbf/in) depends on wire diameter, outer diameter, free length, and number of active coils. Exact spring rate data for each variant is not listed in the product description; if your application requires a specific spring rate, contact us with your wire diameter, OD, and free length selection and we can provide further guidance or point you to a spring rate calculator.
