Compression Springs Wire Dia 1.4mm OD 15mm L 10-200mm 304 Stainless Steel Spring

Measure the distance between your spring seats when the assembly is at rest (uncompressed). Your free length should be longer than this distance by the amount of preload travel you need. For example, if your seat gap is 30 mm and you want 5 mm of preload, choose the 35 mm free-length variant. Always allow for at least 20–30% solid-height clearance to avoid coil bind.

Spring rate (stiffness) is the force required to compress the spring by 1 mm. It depends on wire diameter, coil diameter, and number of active coils — all of which vary by free length. Because spring rate differs across the 18 length variants in this listing, please contact us or refer to the variant detail page for the specific rate of the size you need before finalizing your design.

Yes. 304 stainless steel offers solid resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is suitable for outdoor DIY fixtures, garden equipment, and light marine-adjacent applications. For highly saline or strongly acidic environments, 316 stainless steel would be a more appropriate choice.

The outer diameter of these springs is 15 mm. For a guide rod (inner guide), use a rod diameter of approximately 11–12 mm to allow free movement without excessive lateral play. For a bore (outer guide), use a bore diameter of 15.5–16.5 mm to allow the spring to compress freely without binding against the bore wall.

304 stainless steel retains adequate mechanical properties up to approximately 300°C (572°F) for intermittent use. For continuous elevated-temperature applications above this range, consider springs made from high-temperature alloys. For typical room-temperature to moderately warm environments (up to ~150°C), these springs perform reliably.

If you are prototyping or testing fit, start with a 2–10 piece pack to validate the spring rate and free length before committing to larger quantities. For production runs, jig builds, or stocking a workshop, the 50–100 piece packs offer a lower per-unit cost. Bulk packs are also useful when you anticipate replacement cycles or want spares on hand.

These springs feature closed ends, which provide a flat bearing surface for stable seating. Grinding finish may vary slightly by length variant. If your application requires a precisely ground flat end for load-cell or precision fixture use, please contact us to confirm the end finish for your specific size before ordering.