0.6mm Wire Dia Compression Spring 4-7mm Dia 5-305mm Length A2 Stainless Steel

Measure the bore or guide rod your spring will seat in. The spring's outer diameter should be slightly smaller than the bore (typically 0.1–0.3mm clearance) or slightly larger than the guide rod. For free length, select a spring that is longer than your required working length to allow for compression travel. Use the Wire Dia × OD × Length option selector above to find your size.

A2 stainless steel (equivalent to 304 grade) contains approximately 18% chromium and 8% nickel, giving it good resistance to rust, oxidation, and mild chemical exposure. It performs well in humid indoor environments, light outdoor use, and mild acidic conditions. For highly corrosive or marine environments, A4 (316) stainless would be a stronger choice.

A2 stainless steel retains reasonable mechanical properties up to approximately 250–300°C (480–570°F) for short-term exposure. For continuous high-temperature service above this range, consider springs made from high-temperature alloys. For most electronics, instrumentation, and general mechanical applications at ambient temperatures, these springs are fully suitable.

Yes. A2 stainless steel provides solid corrosion resistance for outdoor and wet conditions in non-marine, non-chloride-heavy environments. They will not rust under normal rain or humidity exposure. Avoid prolonged contact with salt water or strong chloride solutions, which can cause pitting corrosion over time.

The outer diameter (OD) determines which bore or guide the spring fits. A 4mm OD spring fits a bore of approximately 4.1–4.4mm; a 7mm OD spring fits a bore of approximately 7.1–7.4mm. All variants share the same 0.6mm wire diameter, so the spring rate and load capacity will vary with OD and free length. Choose the OD that matches your mechanical housing.

For prototyping or testing, the 5-pack or 10-pack is ideal — enough to validate fit and function without over-committing. For small production runs or stocking a workshop, the 50-pack or 100-pack offers better per-unit value. The 1-piece option is available for single-unit replacement needs.

Yes, springs in this size range are typically manufactured with closed and ground ends, which provide a flat bearing surface for stable seating in spring pockets and against flat plates. This reduces lateral deflection and improves load alignment in precision assemblies.