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When a loose mechanism rattles, a valve fails to seat, or a switch loses its snap-back feel, the culprit is almost always an undersized or worn-out compression spring. Engineers, hobbyists, and repair technicians who work with compact assemblies need a dependable stock of small compression springs that deliver consistent force without taking up precious space. This listing is designed for exactly that user — someone who values dimensional accuracy and material integrity over bulk filler packs.
Each pack contains 10 small compression springs manufactured from spring steel wire. Wire diameter options span 1.0 mm and 1.2 mm (approximately 0.039 in and 0.047 in). Free lengths range from 10 mm to 50 mm (roughly 0.39 in to 1.97 in), with outer diameter options from 5 mm up to 22 mm (approximately 0.20 in to 0.87 in) depending on the selected size variant. The springs feature a tightly wound coil body with closed and ground ends on most sizes, providing flat seating surfaces for stable load application.
Typical use cases include electronic push-button mechanisms requiring a light return force, small pneumatic or hydraulic valve assemblies needing a compression spring for seat sealing, model engineering and robotics projects where a compact spring with a wire diameter of 1.0–1.2 mm fits tight tolerances, and DIY repair of appliances, toys, or precision instruments where an original spring has fatigued or broken.
| Wire Diameter | 1.0 mm or 1.2 mm (see variant options) |
|---|---|
| Outer Diameter | See variant options (range: 5–22 mm / 0.20–0.87 in) |
| Free Length | See variant options (range: 10–50 mm / 0.39–1.97 in) |
| Material | Spring Steel |
| End Type | Closed ends (ground on most sizes) |
| Spring Type | Compression |
| Coil Direction | Right-hand (standard) |
| Surface Finish | See variant options |
| Quantity per Pack | 10 pcs |
| Load Rate | See variant options |
Match three key dimensions to your assembly: outer diameter (must fit inside the bore or housing), free length (must be longer than your required compressed length plus travel), and wire diameter (determines stiffness). Use the variant dropdown to select the combination that fits your clearance and force requirements. When in doubt, order a slightly longer free length — you can always compress further, but you cannot extend a spring beyond its free length.
Spring rate depends on wire diameter, outer diameter, free length, and number of active coils — all of which vary by size variant. Exact load data is not listed here because each size combination produces a different rate. If you need a specific spring rate (N/mm or lbf/in), please contact us with your required dimensions and we can advise on the closest match or provide calculated data.
These springs are made from spring steel, which offers good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For indoor, dry, or lightly humid environments they perform well. For outdoor, wet, or chemically aggressive environments, consider applying a light coat of oil or grease, or contact us about stainless steel alternatives. Do not use in direct contact with strong acids or salt spray without protective treatment.
Yes. The 1.0 mm and 1.2 mm wire diameter sizes are commonly used in push-button switches, battery contacts, and connector retention mechanisms on PCBs and electronic enclosures. The small outer diameters (starting from 5 mm) fit standard switch housings. Ensure the spring's free length and compressed length match your PCB stack-up or housing depth before ordering.
A larger wire diameter (1.2 mm vs 1.0 mm) produces a stiffer spring with a higher spring rate for the same outer diameter and free length. Choose 1.0 mm wire for lighter return forces and more delicate mechanisms; choose 1.2 mm wire when you need a firmer push-back or are working with slightly heavier loads. Both are made from the same spring steel material.
Each order includes 10 springs of the selected size. If you need larger quantities for production runs, prototyping batches, or maintenance kits, please contact us directly. We can discuss bulk pricing and availability for higher quantities of specific size variants.
The three numbers represent: Wire Diameter × Outer Diameter × Free Length, all in millimeters. For example, "1.0 x 8 x 30mm" means a spring with 1.0 mm wire diameter, 8 mm outer diameter, and 30 mm free (uncompressed) length. Use these three values to match the spring to your housing bore, shaft, and travel requirements.
