Compression Spring Spring Steel Pressure Coil 0.9mm Wire OD 5-20mm 10-100mm Shop

Measure the inner diameter of your spring pocket or guide pin diameter first. The spring OD should be slightly smaller than the pocket ID (typically 0.2–0.5mm clearance) or slightly larger than the guide pin OD. For free length, choose a spring that is longer than your required working length so it remains under compression throughout the full stroke.

The wire diameter is 0.9mm across all variants in this listing. Wire diameter directly affects spring rate (stiffness) — a thicker wire produces a stiffer spring for the same OD and length. At 0.9mm, these springs are suited for light-to-medium duty return and preload applications rather than heavy structural loads.

These springs are made from spring steel, which offers good mechanical properties but moderate corrosion resistance. For environments with moisture, mild chemicals, or outdoor exposure, consider applying a light coat of machine oil or grease, or look for stainless steel spring alternatives if long-term corrosion resistance is critical.

Yes. Compression springs in the 5–8mm OD range with free lengths of 15–25mm are commonly used in 3D printer bed leveling. Select an OD that fits your bed knob recess and a free length that gives adequate preload at your typical bed gap. The 10-piece pack provides spares for a full printer bed replacement plus extras.

Each order includes 10 pieces of the selected size. All 10 springs in a pack are identical in wire diameter, outer diameter, and free length as specified by the variant you choose.

Closed-and-ground ends have the last coil wound tightly against the adjacent coil and then ground flat. This creates a stable, square bearing surface that reduces lateral tipping and buckling when the spring is compressed. Open-end springs lack this flat seat and are more prone to cocking under load. The springs in this listing feature closed and ground ends for more reliable performance in guided applications.

Yes. The smaller OD variants (5–8mm) with shorter free lengths (10–20mm) are well suited for tactile button return mechanisms, micro-switch actuators, and keyboard-style switch assemblies where a light, consistent return force is needed. Verify the spring rate matches your required actuation force before finalizing your design.