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Finding a compression spring that holds its load cycle after cycle — without rusting out in damp workshops, outdoor enclosures, or high-humidity environments — is a real challenge for engineers, machinists, and serious DIYers. These 304 stainless steel compression springs are engineered for exactly those conditions, delivering consistent return force across a wide range of mechanical and structural applications.
Each spring is cold-wound from 304-grade stainless steel wire with a diameter of 1.2 mm or 1.4 mm, and an outer diameter ranging from 8 mm to 20 mm (approximately 0.31–0.79 in). Free lengths span 60 mm to 100 mm (approximately 2.36–3.94 in), giving you a broad selection matrix to match your exact travel and load requirements. Ends are closed and ground for flat, stable seating.
Typical use cases include valve and actuator return mechanisms, jig and fixture clamping systems, electronic enclosure latches, automotive trim clips, and custom fabrication projects requiring a reliable compression spring for light-to-medium duty cycling loads.
Cold-wound from 304-grade stainless wire for reliable corrosion resistance in wet, humid, and mildly corrosive environments — far outlasting carbon steel alternatives.
Five free lengths (60 / 70 / 80 / 90 / 100 mm) combined with wire diameters of 1.2 mm and 1.4 mm and outer diameters from 8 mm to 20 mm give you precise control over spring rate and travel.
Flat, closed-and-ground end coils ensure even load distribution and stable seating on flat spring plates or within counterbored pockets — no rocking or tilting under compression.
Uniform coil pitch and controlled wire diameter tolerances deliver repeatable spring rates across the full compression stroke, suitable for cycling applications.
Suited for valves, actuators, jigs, fixtures, latches, automotive trim, electronics enclosures, and general mechanical assemblies requiring a compact pressure spring.
Each listing ships 5 identical springs per pack — ideal for prototyping, small-batch production runs, or keeping matched spares on hand for maintenance.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 1.2 mm or 1.4 mm (see variant options) |
| Outer Diameter (OD) | 8 mm – 20 mm (see variant options) |
| Free Length | 60 / 70 / 80 / 90 / 100 mm (see variant options) |
| End Type | Closed & Ground |
| Spring Type | Compression (Pressure) |
| Winding Direction | Right-hand |
| Surface Finish | Natural (uncoated stainless) |
| Quantity per Pack | 5 PCS |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
Measure the bore or housing your spring will sit in, then select an OD that provides a small clearance fit — typically 0.5–1 mm smaller than the bore. If the spring rides on a guide rod, ensure the inner diameter (OD minus 2× wire diameter) clears the rod with at least 0.3 mm of play. Use the Wire Dia × Outer Dia variant selector to find your match.
Load capacity varies by wire diameter, outer diameter, and free length. Thicker wire (1.4 mm) and smaller OD combinations produce stiffer springs with higher load ratings. For exact spring rate and solid-height data for a specific variant, contact us to confirm before ordering for load-critical applications.
Yes. 304 stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is not recommended for prolonged immersion in chlorinated water or marine saltwater environments — for those, 316 stainless would be more appropriate. For typical outdoor DIY and light industrial use, 304 performs reliably.
Wire diameter directly affects spring stiffness (spring rate) and load capacity. A 1.4 mm wire produces a stiffer spring that can handle higher compressive loads before reaching solid height. A 1.2 mm wire yields a softer spring with lower load capacity but more travel for the same free length. Choose based on the force range your application requires.
304 stainless steel retains adequate mechanical properties up to approximately 300°C (572°F) for intermittent use. For continuous elevated-temperature service above 200°C, consider springs made from high-temperature alloys. For standard workshop, automotive, and indoor mechanical applications, these springs are well within their thermal limits.
Springs are consumable components — they fatigue over time, especially in high-cycle applications. Having matched spares on hand means zero downtime when a spring needs replacement. The 5-piece pack is also ideal for prototyping multiple design iterations simultaneously or for small-batch production where consistent spring performance across units is critical.
Before committing to a final assembly, test the spring in a mock-up or jig: confirm the free length matches your design gap, compress to your working length and verify the force feels appropriate, and check that the spring does not buckle laterally. If the spring buckles, consider a shorter free length or a guide rod/sleeve to constrain it.
