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When a worn-out spring causes a mechanism to fail — a stuck valve, a loose latch, a jammed tool — finding the right replacement fast matters. These 304 stainless steel compression springs are designed for hobbyists, engineers, and maintenance professionals who need consistent elastic performance across a wide range of applications without guessing on size.
Each pack contains 10 compression springs manufactured from 304 stainless steel wire. Wire diameter ranges from 1.6 mm to 1.8 mm (0.063 in – 0.071 in), outer diameter from 10 mm to 30 mm (0.39 in – 1.18 in), and free length from 10 mm to 50 mm (0.39 in – 1.97 in) depending on the variant selected. The helical coil structure is wound with consistent pitch for uniform load distribution.
These compression springs suit a broad range of use cases: replacing springs in mechanical assemblies and jigs, providing return force in DIY automation and robotics projects, and acting as buffer or cushion elements in furniture hardware, door latches, and small appliance repairs. Long-tail applications include stainless steel compression spring for valve seat, small OD compression spring for electronics enclosure, and 304 SS coil spring for maker projects.
Made from 304-grade stainless steel wire, offering solid corrosion resistance in humid, mildly acidic, and outdoor environments compared to carbon steel alternatives.
Wire diameter 1.6 mm or 1.8 mm; outer diameter 10–30 mm; free length 10–50 mm. Choose the exact combination from the variant selector to match your mechanical spec.
Uniform coil pitch across the full spring body ensures even load distribution and repeatable deflection behavior under compression cycles.
Each order includes 10 springs of the selected size — enough for prototyping, batch repairs, or keeping spares on hand for ongoing maintenance work.
Wire diameters of 1.6 mm and 1.8 mm provide light-to-medium spring rates suitable for return mechanisms, latches, valves, and cushioning applications in compact assemblies.
No additional finishing required. Springs are ready to install directly into spring seats, bores, or guide rods matching the specified outer diameter and free length.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 1.6 mm / 1.8 mm (see variant options) |
| Outer Diameter (OD) | 10 mm – 30 mm (see variant options) |
| Free Length | 10 mm – 50 mm (see variant options) |
| Spring Type | Compression (helical coil) |
| End Type | See variant options |
| Surface Finish | Natural / uncoated stainless |
| Spring Rate | See variant options |
| Quantity per Pack | 10 pieces |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
The wire diameter determines the spring rate and load capacity. A 1.8 mm wire is stiffer and handles higher loads than a 1.6 mm wire of the same outer diameter and length. If you need a firmer return force or are replacing a heavier-duty spring, choose 1.8 mm. For lighter mechanisms such as small latches or electronics enclosures, 1.6 mm is typically sufficient. When in doubt, measure the original spring's wire with calipers.
The outer diameter (OD) must fit inside the bore or housing where the spring seats — leave a small clearance (typically 0.5–1 mm) between the OD and the bore wall. The free length should be longer than the installed (compressed) length to ensure the spring exerts force. Measure the spring pocket depth and the gap you need to close, then select a free length that gives adequate preload.
These springs are designed for light-to-medium duty applications. With wire diameters of 1.6–1.8 mm and ODs up to 30 mm, they are well-suited for return mechanisms, valve seats, latches, and cushioning in compact assemblies. They are not intended for heavy structural or high-cycle fatigue applications. For critical load-bearing use, consult a spring engineer and verify the spring rate against your load requirements.
304 stainless steel offers good corrosion resistance in most atmospheric and mildly corrosive environments, including humidity, rain, and light chemical exposure. It is not recommended for prolonged immersion in saltwater or highly acidic/chloride-rich environments — for those conditions, 316 stainless steel is a better choice. For typical DIY, indoor mechanical, and light outdoor use, 304 SS performs reliably without rusting under normal conditions.
Yes, as long as you select the correct outer diameter. The OD listed is the nominal outer diameter of the coil. For a spring guide rod (inner guide), the inner diameter of the spring should be slightly larger than the rod — calculate inner diameter as OD minus twice the wire diameter. For a bore (outer guide), the OD should be slightly smaller than the bore. Always verify clearances before installation.
Absolutely. The smaller OD variants (10–16 mm) with shorter free lengths (10–25 mm) are popular for button return mechanisms, sensor mounts, gripper fingers, and small actuator assemblies in robotics and maker projects. The stainless steel material is non-magnetic (304 SS is austenitic), which is an advantage in applications sensitive to magnetic interference.
The standard listing provides 10 pieces per pack, which is ideal for prototyping, single repairs, or low-volume production. If you need 150 pieces of a specific size, a bulk variant (1.6mm – 150 Psc) is available for the 22 mm OD / 45 mm length combination. For other sizes in bulk, contact us to confirm availability and pricing.
