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When a project demands consistent return force in a confined space, undersized or mismatched springs cause misfires, binding, and premature failure. Engineers, hobbyists, and repair technicians working on small mechanisms — from pen clickers and valve assemblies to sensor housings and precision instruments — need springs that hold exact tolerances across every cycle. These miniature compression springs are stocked in a broad matrix of wire diameters, outer diameters, and free lengths so you can match the right spring to the right bore without compromise.
Each spring is formed from round steel wire with wire diameters ranging from 0.6 mm to 0.9 mm (approximately 0.024 in to 0.035 in), outer diameters from 5 mm to 14 mm (approximately 0.20 in to 0.55 in), and free lengths from 10 mm to 100 mm (approximately 0.39 in to 3.94 in). The coil ends are closed and ground flat for stable seating. Sold in packs of 10 per variant.
Typical use cases include miniature valve and actuator return springs, electronic component retention in PCB fixtures, small appliance and tool trigger mechanisms, and model-making or robotics projects requiring repeatable spring force in tight bores.
| Wire Diameter Range | 0.6 mm – 0.9 mm (0.024 in – 0.035 in) |
|---|---|
| Outer Diameter Range | 5 mm – 14 mm (0.20 in – 0.55 in) |
| Free Length Range | 10 mm – 100 mm (0.39 in – 3.94 in) |
| End Type | Closed and ground |
| Coil Direction | See variant options |
| Material | Steel wire (round cross-section) |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Load at Solid Height | See variant options |
| Packing Quantity | 10 pieces per pack |
| Variant Naming Format | Wire Ø × Outer Ø × Free Length (mm) |
The variant name follows the format Wire Diameter × Outer Diameter × Free Length, all in millimeters. For example, 0.7×8×50mm means a wire diameter of 0.7 mm, an outer diameter of 8 mm, and a free length of 50 mm. Measure your bore inner diameter, the available axial space, and the wire gauge you need, then match those three numbers to the correct variant.
As a general guideline, the bore (hole) inner diameter should be approximately 0.2–0.5 mm larger than the spring's outer diameter to allow free movement without excessive lateral play. For example, a spring with a 8 mm outer diameter typically fits a bore of 8.2–8.5 mm. Always verify with your specific assembly tolerances.
Spring rate (stiffness) depends on wire diameter, outer diameter, number of active coils, and material modulus. Because these springs span a wide size range, the rate varies by variant. If you need a specific force at a defined deflection, contact us with your wire diameter, outer diameter, free length, and required load so we can confirm suitability or recommend an alternative size.
These springs are formed from standard steel wire and are not inherently corrosion-resistant. For applications exposed to moisture, mild chemicals, or outdoor conditions, consider applying a light coating of oil or grease, or contact us to confirm whether a coated or stainless variant is available for your required size. For dry, indoor, or enclosed mechanisms they perform reliably without additional treatment.
Standard steel compression springs are generally suitable for temperatures up to approximately 120°C (248°F) before significant loss of spring properties occurs. For applications above this range — such as engine bays, industrial ovens, or high-heat tooling — a heat-resistant alloy spring would be more appropriate. Contact us to confirm operating temperature requirements before ordering.
Thicker wire diameters produce stiffer springs with higher load capacity for a given outer diameter and free length. Choose a thinner wire (0.6–0.7 mm) when you need a light, gentle return force in a very small bore. Choose a thicker wire (0.8–0.9 mm) when you need more resistance or the spring must support a heavier component. If you are replacing an existing spring, measure the wire diameter with calipers before selecting.
Each variant is sold in a pack of 10 identical springs. This gives you spares for prototyping, multi-unit production runs, or repair stock. The pack quantity is fixed at 10 per order line; if you need larger quantities, simply increase the order quantity at checkout.
