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When a worn-out spring causes a mechanism to fail mid-project — whether it's a jig, a fixture, a valve, or a tool — finding the exact replacement size quickly matters. These 304 stainless steel compression springs are designed for engineers, machinists, and serious DIYers who need reliable, dimensionally consistent springs across a wide range of sizes without ordering custom parts.
Each pack contains 10 compression springs manufactured from 304 stainless steel wire. Wire diameters are available in 1.0 mm (~0.039 in) and 1.2 mm (~0.047 in). Outer diameters span 6 mm to 20 mm (~0.24 in to ~0.79 in), and free lengths range from 10 mm to 50 mm (~0.39 in to ~1.97 in). Springs feature closed and ground ends for stable seating and consistent load distribution.
These compression springs suit a broad range of use cases: replacing springs in electronic enclosures and PCB assemblies, providing return force in pneumatic and hydraulic valve assemblies, acting as tension elements in custom jigs and fixtures, and serving as buffer springs in light-duty mechanical linkages. The 304 stainless steel construction makes them a reliable choice for indoor and mildly humid environments where mild corrosion resistance is needed.
Made from 304-grade stainless steel wire, offering solid corrosion resistance in indoor and mildly humid environments without surface treatment.
Wire diameters 1.0 mm and 1.2 mm; outer diameters from 6 mm to 20 mm; free lengths from 10 mm to 50 mm — covering a broad range of replacement and design needs.
Closed and ground end coils provide a flat, stable seating surface, ensuring consistent load application and reducing lateral deflection under compression.
Each order includes 10 springs of the selected size — enough for prototyping, batch repairs, or stocking a spare-parts kit without over-ordering.
Uniform wire diameter and coil pitch across each batch ensures repeatable spring rate and deflection behavior, important for load-sensitive assemblies.
Suitable for valve return springs, PCB standoffs, jig tensioners, door latches, pen mechanisms, and other light-to-medium load compression applications.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 1.0 mm / 1.2 mm (see variant options) |
| Outer Diameter (OD) | 6 mm – 20 mm (see variant options) |
| Free Length | 10 mm – 50 mm (see variant options) |
| End Type | Closed and Ground |
| Spring Type | Compression |
| Coil Direction | Right-hand |
| Surface Finish | Natural (uncoated stainless) |
| Quantity per Pack | 10 pieces |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
Wire diameter directly affects spring stiffness (spring rate). A 1.2 mm wire produces a stiffer spring with higher load capacity compared to a 1.0 mm wire of the same outer diameter and length. If your application requires a firmer return force or higher load, choose 1.2 mm. For lighter-duty applications or where a softer feel is needed, 1.0 mm is the better choice. When in doubt, calculate the required spring rate based on your deflection and load requirements.
The outer diameter (OD) listed in the variant options is the overall coil diameter measured from the outside of the wire on one side to the outside of the wire on the opposite side. The inner diameter (ID) is approximately OD minus twice the wire diameter. For example, a 1.0 mm wire spring with 8 mm OD has an ID of approximately 6 mm. Use the ID to check clearance over a guide rod, and the OD to check fit inside a bore or housing.
304 stainless steel offers good corrosion resistance in dry indoor and mildly humid conditions. It is not recommended for prolonged exposure to saltwater, chlorinated water, or highly acidic/alkaline environments. For marine or harsh outdoor applications, 316 stainless steel springs would be a more appropriate choice. For general indoor DIY, workshop, and light industrial use, 304 stainless steel performs reliably.
Measure three dimensions: (1) Free length — the overall length of the spring when uncompressed; (2) Outer diameter — use calipers to measure across the outside of the coils; (3) Wire diameter — measure the thickness of the wire itself with calipers. Match these three values to the variant options. If your existing spring is slightly worn or compressed, measure carefully in its relaxed state. Contact us to confirm if you are unsure which variant matches your application.
Yes. The smaller sizes (OD 6–10 mm, length 10–20 mm) are commonly used as contact springs, battery terminal springs, and PCB standoff springs in electronic enclosures. The uncoated 304 stainless steel surface is electrically conductive, which can be useful for grounding or contact applications. Ensure the spring dimensions match your housing and contact pad geometry before ordering.
Load capacity and maximum safe deflection depend on the specific wire diameter, outer diameter, free length, and number of active coils. As a general guide, 1.0 mm wire springs in this range handle light loads (typically under 5–15 N depending on size), while 1.2 mm wire springs handle moderate loads (typically 10–30 N depending on size). Do not compress beyond the solid height (all coils touching) to avoid permanent set. If you need exact spring rate data for your variant, contact us to confirm.
Each order includes 10 springs of your selected size combination (wire diameter, outer diameter, and free length). This quantity is suitable for prototyping, small batch repairs, or building a spare-parts inventory. If you need larger quantities for production or commercial use, contact us to discuss bulk pricing and availability.
