1.2mm Wire Dia Compression Spring 14-20mm Dia 10-200mm Length A2 Stainless Steel

Start with the outer diameter (OD) — it must fit inside your spring pocket or housing with a small clearance (typically 0.5–1mm). Then select a free length longer than your required compressed length to ensure the spring generates force throughout its travel. Finally, match the wire diameter to your load requirement: 1.2mm wire suits light to moderate loads in the 14–20mm OD range.

A2 stainless steel (also known as 304 stainless) contains approximately 18% chromium and 8% nickel, giving it good corrosion resistance in humid, wet, and mildly acidic environments. Carbon steel springs are stronger at equivalent wire diameters but will rust without protective coating. For outdoor, marine-adjacent, or food-adjacent applications, A2 stainless is the more durable long-term choice.

Yes. A2 stainless steel provides solid resistance to atmospheric corrosion, rain, and moderate humidity. It is not recommended for prolonged immersion in chloride-rich solutions (e.g. seawater) or strong acids, where A4 (316) stainless would be more appropriate. For general outdoor DIY and workshop use, these springs perform reliably without surface treatment.

Closed ends mean the final coil is wound tightly against the adjacent coil, reducing the active coil count at each end. Ground ends means the closed end coil is machined flat, creating a perpendicular bearing surface. This combination ensures the spring sits squarely on flat surfaces and inside spring pockets, preventing lateral buckling and improving load consistency.

Yes. The 14–20mm outer diameter and 1.2mm wire diameter make these springs well-suited for hobby robotics, 3D printer mechanisms, RC vehicle suspension prototypes, and DIY electronics enclosures where a compact, corrosion-resistant return spring is needed. Select the shortest free length that still provides adequate travel for your mechanism.

Order 1 piece if you are testing fit and function before committing to a larger quantity. Order 5 or 10 for small production runs, prototyping batches, or to keep spares on hand. Order 20 if you are building multiple assemblies or want the best per-unit value for a known-good size. All pack sizes ship the same spring — only the quantity differs.

All sizes share the same 1.2mm wire diameter, so the spring rate per unit length is similar across the range. The outer diameter determines which housing bore or spring pocket the spring fits into. A larger OD spring will have a slightly larger inner diameter (ID = OD − 2 × wire dia), which affects the guide rod size it can accept. Choose the OD that matches your housing or guide rod specification.