Compression Spring A2 Stainless Steel WireDia.=1.0mm OD=13~18mm Y Type Spring

Measure the bore or housing inner diameter your spring must fit inside — the spring OD should be 0.5–1.5 mm smaller than the bore for clearance. For free length, select a spring whose free length is longer than your required compressed length plus the desired travel (deflection). Use the variant selector above to pick the OD and free length combination that matches your design.

Spring rate depends on wire diameter, OD, and number of active coils (which varies with free length). With a 1.0 mm wire and OD 13–18 mm, these are light-duty springs suited for return, positioning, and light clamping forces. For exact spring rate values, contact us to confirm for your specific size variant.

A2 (304) stainless steel offers good resistance to moisture, humidity, and mild chemical exposure. It is suitable for indoor applications and light outdoor use where the spring is not continuously submerged or exposed to chlorides (e.g., saltwater or pool environments). For highly corrosive conditions, consider A4 (316) stainless steel alternatives.

"Y-Type" refers to the open-coil cylindrical geometry of the spring — a standard compression spring form with uniform coil pitch along the body. This geometry provides consistent deflection and is compatible with standard spring seats, plunger guides, and housing bores. It is distinct from conical or barrel-shaped spring profiles.

Yes. The consistent wire diameter (1.0 mm) and controlled OD tolerances make these springs suitable for light-duty automation components, sensor return mechanisms, valve assemblies, and precision instrument applications where repeatable spring force is required. Verify the required spring rate and solid height against your design specifications before ordering.

Longer springs (e.g., 120 mm–305 mm) have greater individual mass and volume, so pack quantities are adjusted (1–5 pcs per pack) to keep order weights and packaging practical. Shorter lengths (10–50 mm) are available in larger packs (up to 50 pcs) for projects requiring multiple springs. Select the pack size that matches your quantity need from the variant options above.

The outer diameter determines which bore or housing the spring fits. A 13 mm OD spring fits a bore of approximately 14–15 mm; an 18 mm OD spring fits a bore of approximately 19–20 mm. Choose the OD that provides 0.5–1.5 mm clearance inside your housing. All OD variants share the same 1.0 mm wire diameter, so the spring rate will vary slightly with OD due to differences in mean coil diameter.