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When a project demands reliable spring force in a compact form, finding the right compression spring can be frustrating — wrong wire diameter, wrong free length, or a material that corrodes after a few weeks. These stainless steel compression springs with a 0.9mm wire diameter are designed for makers, engineers, and DIY enthusiasts who need consistent performance across a wide range of applications without compromising on corrosion resistance.
Each spring is formed from stainless steel wire with a wire diameter of 0.9mm (approx. 0.035 in). Outer diameters span 5mm to 16mm (approx. 0.20–0.63 in), and free lengths range from 8mm to 50mm (approx. 0.31–1.97 in). Available in packs of 10 or 50 pieces to suit both prototyping and production needs.
Typical use cases include small mechanism assemblies, electronic enclosure latches, pen and clicker mechanisms, model engineering projects, and light-load return spring applications in jigs and fixtures — all scenarios where a compact stainless steel compression spring with precise wire diameter control makes the difference.
Consistent wire gauge across all size variants ensures predictable spring rate and reliable force output for precision assemblies.
Corrosion-resistant material withstands moisture, mild chemicals, and outdoor exposure — suitable for long-term use in demanding environments.
Outer diameters from 5mm to 16mm and free lengths from 8mm to 50mm give you the flexibility to match your exact housing and travel specifications.
Order a small trial pack of 10 for prototyping, or stock up with 50 pieces for production runs and repair kits — both options available per size.
Uniform pitch and closed ends provide stable seating on flat surfaces, reducing lateral buckling and ensuring repeatable compression behavior.
Ideal for pen mechanisms, electronic latches, model engineering, jig return springs, and any compact mechanism requiring a reliable small compression spring.
| Spring Type | Compression Spring |
|---|---|
| Wire Diameter | 0.9 mm (approx. 0.035 in) |
| Outer Diameter (OD) | 5 / 6 / 7 / 8 / 9 / 10 / 12 / 14 / 16 mm — See variant options |
| Free Length | 8 – 50 mm (approx. 0.31 – 1.97 in) — See variant options |
| Material | Stainless Steel |
| End Type | Closed ends (typical for this wire diameter range) |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Pack Quantity | 10 pcs or 50 pcs — See variant options |
| Surface Finish | Natural stainless steel |
Measure the inner bore of the housing or guide rod where the spring will sit. The spring's outer diameter should be slightly smaller than the bore (typically 0.2–0.5mm clearance) to allow free compression without binding. For guide rod applications, the inner diameter of the spring should be slightly larger than the rod diameter.
The free length is the uncompressed length of the spring. Choose a free length that is longer than your required working length by at least the amount of travel (compression distance) you need. For example, if you need 15mm of travel and a 10mm working height, select a spring with a free length of at least 25mm.
Yes. These springs are made from stainless steel, which provides good resistance to rust, moisture, and mild chemical exposure. They are suitable for outdoor, humid, or lightly corrosive environments. For highly aggressive chemical environments, please verify material compatibility with your specific conditions.
With a 0.9mm wire diameter, these are light-duty compression springs suited for low-to-medium load applications such as pen mechanisms, small latches, electronic enclosures, and model engineering. The exact spring rate depends on the outer diameter and free length of the specific variant. For precise load calculations, contact us to confirm.
Yes, stainless steel construction makes these springs suitable for outdoor and wet environments. They resist surface rust and maintain their mechanical properties under normal weather exposure. Avoid prolonged contact with strong acids or chlorides for best longevity.
Both packs contain identical springs — the only difference is quantity. The 10-piece pack is ideal for prototyping, testing, or small repairs. The 50-piece pack offers better value per unit for production runs, stocking a repair kit, or projects requiring multiple springs of the same size.
Check three key dimensions: (1) outer diameter vs. your housing bore, (2) free length vs. your available space, and (3) wire diameter vs. your load requirement. If you are replacing an existing spring, measure the old spring's wire diameter, outer diameter, and free length directly. Our variant options list all three parameters clearly.
