Compression Spring Stainless Steel 0.6mm 0.8mm Wire Dia Pressure Coil Springs

Wire diameter directly affects spring stiffness (spring rate). The 0.8 mm wire produces a stiffer spring with higher load capacity for a given OD and length, while the 0.6 mm wire is better suited for lighter loads and more sensitive return mechanisms. If you need a softer touch — such as in a button or latch — start with 0.6 mm. For heavier-duty return or pressure applications, choose 0.8 mm.

The spring OD should be slightly smaller than the bore or housing it sits in (typically 0.5–1 mm clearance) so it can compress freely without binding. If the spring sits over a rod or pin, the spring's inner diameter (ID = OD minus 2× wire diameter) must be larger than the rod diameter. Use the variant options to find the OD that fits your assembly.

Free length is the uncompressed length of the spring. Choose a free length that is longer than your required working length by at least the amount of travel (deflection) you need. For example, if you need 10 mm of travel and your compressed height is 15 mm, you need a free length of at least 25 mm. Always leave some solid-height margin to avoid coil bind.

Yes. Stainless steel provides good corrosion resistance in humid, light outdoor, and splash-prone environments. For prolonged submersion or highly aggressive chemical environments, verify compatibility with your specific conditions. For typical indoor DIY, maker, and light industrial use, stainless steel is a reliable choice over carbon steel alternatives.

Yes. These compression springs are commonly used in 3D printer bed leveling assemblies, CNC fixture clamps, pneumatic valve returns, and general automation hardware. Select the OD and free length that match your specific mounting geometry. The consistent linear spring rate of the open-coil design suits repetitive-motion applications well.

Pack quantity varies by size. Shorter and smaller springs typically come in packs of 10, mid-range lengths in packs of 3–5, and longer springs (120 mm and above) in packs of 1–4. The exact quantity is shown in the "Length & Quantity (pcs)" variant selector above. Select your preferred size and quantity combination before adding to cart.

Compression springs resist being compressed — they push back when squeezed. Extension springs resist being stretched — they pull back when elongated. Torsion springs resist twisting. For push-button returns, valve returns, and pressure applications where two surfaces are being pushed apart, compression springs are the correct choice.