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When a worn-out or undersized spring causes equipment failure, vibration issues, or inconsistent return force, finding the exact wire diameter and outer diameter combination matters. Engineers, maintenance technicians, and serious DIYers working on machinery, appliances, automotive components, or custom fabrication projects need a reliable source for precision-spec compression springs in a wide range of sizes.
These compression springs are manufactured from 304 stainless steel wire, offering a balance of tensile strength and corrosion resistance. The fixed free length is 305mm (approximately 12 inches). Wire diameters range from 0.3mm to 5mm, and outer diameters span from 3mm to 60mm (approximately 0.12 to 2.36 inches), covering a broad spectrum of load and deflection requirements. Available in quantities of 1, 3, 5, 10, 20, 50, and 100 pieces per order.
Typical applications include compression spring replacement in industrial machinery and automation equipment, return-force mechanisms in jigs and fixtures, custom suspension or damping assemblies in DIY fabrication, and load-bearing components in appliance repair and robotics projects requiring stainless steel compression springs with precise wire-to-outer-diameter ratios.
Made from 304-grade stainless steel wire, these compression springs resist oxidation and surface corrosion in humid, wet, or mildly corrosive environments — suitable for both indoor and outdoor mechanical applications.
All springs in this listing share a consistent 305mm (approx. 12 in) free length, making them straightforward to spec into designs where axial travel and compressed height are calculated from a known starting dimension.
Wire diameters from 0.3mm to 5mm allow selection across a broad load range — from light-duty return springs in small mechanisms to heavier-duty compression springs in structural or industrial assemblies.
Outer diameters from 3mm to 60mm (approx. 0.12 to 2.36 in) cover a wide variety of bore sizes and housing configurations, reducing the need to custom-order springs for standard mechanical designs.
Order as few as 1 piece for prototyping or repair, or up to 100 pieces for production runs and maintenance stock. Quantity pricing scales accordingly, making this listing practical for both one-off projects and ongoing operations.
Uniform coil pitch and closed ends (typical for this spring type) provide stable seating on flat surfaces and predictable load-deflection behavior across the compression range — important for repeatable mechanical performance.
| Material | 304 Stainless Steel |
|---|---|
| Free Length | 305mm (approx. 12 in) |
| Wire Diameter | 0.3mm – 5mm (see variant options) |
| Outer Diameter | 3mm – 60mm (see variant options) |
| Inner Diameter | See variant options |
| Spring Type | Compression (Pressure Spring) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Available Quantities | 1 / 3 / 5 / 10 / 20 / 50 / 100 pcs |
| Weight | See variant options |
Start by measuring the bore or housing your spring will sit in — the outer diameter of the spring must be smaller than the bore. Then determine the load you need the spring to support and the travel distance (deflection). Heavier loads and shorter deflection typically require a larger wire diameter relative to the outer diameter. If you have an existing spring to replace, measure its wire diameter, outer diameter, and free length directly with calipers.
Spring rate (measured in N/mm or lbf/in) describes how much force is required to compress the spring by one unit of length. A higher wire-diameter-to-outer-diameter ratio generally produces a stiffer spring with a higher rate. Because spring rate varies by specific wire and outer diameter combination, please contact us to confirm the rate for your selected variant if this is critical to your design.
304 stainless steel provides good resistance to atmospheric corrosion, moisture, and mild chemical exposure. It is suitable for most outdoor DIY applications, light industrial environments, and humid indoor settings. For highly aggressive environments involving saltwater, strong acids, or chlorine-heavy conditions, 316 stainless steel would be more appropriate — these springs are 304 grade.
The variant label format is Wire Diameter × Outer Diameter, both in millimeters. For example, "1*10mm" means the spring wire is 1mm thick and the overall outer coil diameter is 10mm. Select the combination that matches your bore size and load requirements. The inner diameter (ID) can be estimated as: Outer Diameter minus (2 × Wire Diameter).
304 stainless steel retains reasonable mechanical properties up to approximately 300–400°C (570–750°F) for short-term exposure. For continuous high-temperature service above this range, specialized alloys such as Inconel or high-temperature spring steel would be more appropriate. For standard machinery, appliances, and DIY applications at ambient or moderately elevated temperatures, these springs are well-suited.
The compressed (solid) length of a compression spring is approximately: Number of coils × Wire Diameter. As a conservative estimate, allow for a compressed length of roughly 15–25% of the free length (305mm) for most standard compression spring designs, but verify with your specific variant's coil count if precision is required. Contact us if you need coil count data for a specific size.
Each size variant is available in quantities of 1, 3, 5, 10, 20, 50, and 100 pieces. Bulk quantity options (50 and 100 pcs) are available for production, maintenance stock, or resale purposes. Select your preferred quantity using the QTY option above before adding to cart.
While 304 stainless steel is commonly used in food-grade and medical-adjacent applications, these springs are not certified to food-grade or medical device standards. If compliance certification is required, please contact us before ordering to discuss your specific needs.
