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Engineers, makers, and repair technicians who need a dependable small-diameter compression spring often struggle to find the right length without ordering custom parts. These 304 stainless steel compression springs solve that problem with a broad size matrix — wire diameter 1mm, outer diameter 9mm or 10mm, and free lengths ranging from 10mm to 305mm (approx. 0.39 in to 12.0 in) — so you can match the exact travel and load requirement of your application without compromise.
Each spring is formed from 304-grade stainless steel wire with a nominal wire diameter of 1mm (0.039 in). The outer diameter is either 9mm (0.354 in) or 10mm (0.394 in) depending on the size option selected. Free lengths span 10mm through 305mm, with tightly wound coils and squared-and-ground ends on longer variants for stable seating. Packs range from 1 to 100 pieces to suit prototyping quantities or production runs.
Typical use cases include CNC machine tool return mechanisms, 3D-printer extruder tensioners, robotics joint preload, electronic button and switch assemblies, and general-purpose DIY fixture clamping — all scenarios where a compact, corrosion-resistant compression spring with consistent spring rate is required.
Formed from 304-grade stainless steel wire for solid oxidation resistance in humid, mildly corrosive, and outdoor environments without surface coating.
Consistent 1mm wire cross-section across all size options ensures predictable spring rate and uniform coil geometry for repeatable performance.
Twenty-eight free-length options from 10mm to 305mm (0.39–12.0 in) cover short-stroke button springs through long-travel fixture clamps in a single product family.
Choose OD 9mm or OD 10mm to match your bore or spring seat, with inner diameters of approximately 7mm and 8mm respectively for guided-rod installations.
Available in packs from 1 to 100 pieces — order a small sample for prototyping or a full pack for production assembly without paying custom-order minimums.
Suited for CNC return mechanisms, 3D-printer tensioners, robotics preload, electronic switch assemblies, and general DIY clamping fixtures requiring a compact spring.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 1mm (0.039 in) |
| Outer Diameter (OD) | 9mm (0.354 in) or 10mm (0.394 in) — see variant options |
| Inner Diameter (ID) | Approx. 7mm (OD 9mm) / 8mm (OD 10mm) |
| Free Length | 10mm – 305mm (0.39 in – 12.0 in) — see variant options |
| Spring Type | Compression |
| End Type | Closed / Squared (typical for this wire gauge) |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Pack Quantity | 1 / 2 / 3 / 4 / 5 / 6 / 8 / 10 / 12 / 15 / 16 / 18 / 20 / 25 / 30 / 35 / 40 / 50 / 60 / 70 / 80 / 90 / 100 Pcs |
Measure the distance between the spring seats when the mechanism is at rest (uncompressed). Select a free length that is longer than this distance by the amount of travel you need. For example, if your seat gap is 20mm and you need 10mm of compression travel, choose a free length of approximately 30mm.
Both use the same 1mm wire diameter. The OD 9mm spring has an inner diameter of approximately 7mm, while the OD 10mm spring has an inner diameter of approximately 8mm. Choose based on the bore diameter of your housing or the diameter of the guide rod the spring will slide over.
Yes. 304 stainless steel provides solid resistance to atmospheric oxidation and mild moisture exposure. It performs well in humid indoor environments, light outdoor use, and applications where occasional water contact occurs. For highly aggressive chemical or saltwater environments, 316 stainless steel would be a stronger choice.
Yes. The inner diameter is approximately 7mm for OD 9mm springs and 8mm for OD 10mm springs. Select a guide rod with a diameter at least 0.5–1mm smaller than the inner diameter to allow free movement without binding.
For initial prototyping and fit-testing, a pack of 2–5 pieces is usually sufficient. For small production runs or assembly batches, packs of 20–50 pieces offer a cost-effective per-unit price. Packs of 100 are available for higher-volume needs.
Common uses include CNC machine tool return mechanisms, 3D-printer extruder and bed-leveling tensioners, robotics joint preload, electronic button and tactile switch assemblies, valve return springs, and general DIY fixture clamping. The compact 1mm wire diameter makes them well-suited for space-constrained designs.
Springs in this wire gauge and OD range typically feature closed and squared ends to provide a flat seating surface and reduce lateral deflection under load. If your application requires ground ends for precise parallelism, contact us to confirm before ordering.
