Compression Spring Y Type Wire Dia.=1.5mm OD=10mm~12mm A2 Stainless Steel Spring

Measure the bore or housing your spring will sit inside. The spring OD should be slightly smaller than the bore to allow free movement — typically 0.5 mm to 1 mm clearance. For a 10 mm bore, choose the 10 mm OD spring and verify fit. If the spring rides on a guide rod, the rod diameter should be smaller than the spring's inner diameter (OD minus 2× wire diameter = approximately 7 mm for the 10 mm OD variant).

Start with the free length (uncompressed). Your working length is the free length minus the required compression stroke. As a general rule, avoid compressing a spring beyond 80% of its free length to prevent coil bind and premature fatigue. For example, a 50 mm free-length spring should not be compressed below approximately 10 mm solid height in normal use.

Spring rate (force per unit of compression) varies by OD and free length. Shorter springs with the same wire and OD will generally have a higher spring rate than longer ones. Exact load data is not published for each variant — if you need a specific spring rate, please contact us with your OD, free length, and required load so we can confirm suitability before ordering.

Yes. A2 (304) stainless steel provides good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is suitable for outdoor enclosures, garden equipment, and light marine environments. For highly aggressive saltwater or chemical environments, A4 (316) stainless steel would offer superior resistance — contact us if you need A4 grade options.

Yes, the closed and ground ends provide flat seating surfaces compatible with standard spring pockets and guide rods. The 10 mm OD variant fits housings designed for 10 mm springs; the 11 mm and 12 mm variants fit their respective housings. Always verify the inner diameter of your housing and the diameter of any guide rod against the spring dimensions before assembly.

For prototyping or single repairs, the 1 or 2-piece packs are the most economical entry point. For workshop stocking or small production runs, the 10, 20, or 50-piece packs offer a lower per-unit cost. The pack quantity is shown in the variant name alongside the spring dimensions (e.g., "20mm & 1.5×10×20mm (10 pcs)").

The outer diameter determines which bore or housing the spring fits into, and also influences the spring rate — a larger OD with the same wire diameter and free length will generally produce a slightly different rate. Choose based on your housing bore size first, then verify the spring rate meets your load requirements. All three OD options share the same 1.5 mm wire diameter and A2 stainless steel material.