Compression Springs Wire Dia 1.6mm OD 20mm L 10-200mm 304 Stainless Steel Spring

Measure the distance between the two spring seats when the assembly is at rest (uncompressed). Select a free length that is longer than this distance by the amount of travel you need. For example, if your seat gap is 30 mm and you need 10 mm of travel, a free length of 40–50 mm is a reasonable starting point. Always verify the compressed length does not exceed the solid height of the spring.

Spring rate (N/mm or lbf/in) describes how much force is required to compress the spring by one unit of length. A higher rate means more force per mm of travel. The rate for each size variant depends on wire diameter, OD, and number of active coils. Contact us with your load and travel requirements if you need rate data for a specific length.

Yes. 304 stainless steel offers good corrosion resistance in rain, humidity, and mild salt exposure. For highly aggressive environments such as marine splash zones or strong acid/chloride contact, 316 stainless steel would be a more suitable choice. These springs are not coated or plated, so the natural stainless surface is the protective layer.

For a guide rod (inner guide), the rod diameter should be smaller than the inner diameter — approximately 14–16 mm is typical for a 20 mm OD / 1.6 mm wire spring to allow free movement without binding. For a bore (outer guide), the bore should be at least 20.5–21 mm to allow the spring to compress without rubbing the wall.

304 stainless steel retains reasonable mechanical properties up to approximately 300 °C (572 °F) for intermittent use. Continuous elevated-temperature service above 200 °C may cause gradual relaxation (spring set). For high-temperature applications, consider specifying a high-temp alloy. For typical room-temperature and moderate-heat environments, these springs perform reliably.

Order 1–3 pcs for prototyping and fit verification before committing to a larger quantity. Once you confirm the free length, spring rate, and fit are correct for your assembly, ordering 10–50 pcs reduces the per-unit cost and ensures you have spares on hand for maintenance or production runs.

Yes, these springs have closed and ground ends. Ground ends create a flat, perpendicular seating surface that minimizes side-load and keeps the spring axis aligned with the load axis. This is important in precision fixtures, guided assemblies, and any application where off-axis force could cause premature wear or binding.