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Engineers, makers, and repair technicians who need a reliable return force in tight spaces often struggle to find springs that hold their rated load without corroding or fatiguing prematurely. These 2mm wire diameter compression springs are designed for exactly that challenge, offering a consistent, measurable push force in assemblies where precision matters and space is limited.
Each spring is formed from A2 (304) stainless steel wire with a nominal diameter of 2mm (0.079 in). The outer diameter is either 20mm (0.787 in) or 22mm (0.866 in) depending on the variant selected, and free lengths range from 10mm (0.39 in) up to 200mm (7.87 in). The close-wound coil body transitions to flat ground ends on longer variants, ensuring square seating against mating surfaces.
Typical use cases include valve return mechanisms in fluid systems, spring-loaded latches and panel fasteners, jig and fixture clamping assemblies, and electronic enclosure button returns — anywhere a 2mm wire compression spring with a 20–22mm outer diameter is specified for light-to-medium load applications.
| Wire Diameter | 2mm (0.079 in) |
|---|---|
| Outer Diameter | 20mm (0.787 in) or 22mm (0.866 in) — see variant options |
| Free Length Range | 10mm – 200mm (0.39 in – 7.87 in) |
| Material | A2 Stainless Steel (Grade 304) |
| Spring Type | Compression (open coil) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
| Pack Size | 1 / 3 / 5 / 10 / 20 / 50 pieces |
Match the outer diameter to the bore or housing your spring sits inside. The spring OD should be slightly smaller than the bore ID to allow free compression without binding. If your bore is 21–22.5mm, the 20mm OD spring typically fits; for bores of 23–24mm, the 22mm OD is the better choice. Always confirm clearance with your specific housing dimensions.
A 2mm wire diameter spring is suited to light-to-medium loads. The exact load capacity depends on the free length, number of active coils, and deflection distance. Shorter springs with fewer coils are stiffer; longer springs are softer. If you have a specific load requirement in Newtons or pounds-force, contact us with your free length and deflection distance and we can help confirm suitability.
Yes. A2 (Grade 304) stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is not recommended for prolonged contact with chloride-rich environments such as seawater or de-icing salts, where A4 (Grade 316) stainless would be more appropriate. For most indoor, outdoor, and light industrial applications, A2 stainless performs reliably without additional coating.
These springs are widely used in valve return mechanisms, spring-loaded latches, panel fasteners, jig and fixture clamping, electronic enclosure button returns, medical device assemblies, and DIY automation projects. The 20–22mm OD range fits many standard spring housings used in light machinery and consumer product design.
The free length should be longer than your installed (compressed) length by at least the deflection distance you need. For example, if your assembly compresses the spring by 10mm and you need 5mm of working travel, you need at least 15mm of deflection from free length. Add a safety margin of 10–20% to avoid coil bind. Use the variant selector above to choose from 10mm to 200mm free lengths.
Absolutely. Every size in this range is available as a single piece (Pack Size: 1), so you can validate fit, load, and deflection in your prototype before ordering 3, 5, 10, 20, or 50-piece packs for production or maintenance stock. Bulk packs offer a lower per-unit cost.
A2 (304) stainless steel is the most common grade, offering good corrosion resistance for general-purpose use. A4 (316) stainless adds molybdenum, which significantly improves resistance to chlorides and marine environments. For most DIY, industrial, and indoor applications, A2 is sufficient and more cost-effective. If your application involves saltwater, marine exposure, or aggressive chemicals, consider A4 grade instead.
