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Finding a compression spring that fits a tight bore, holds consistent load, and resists rust in a damp workshop or outdoor enclosure is a genuine challenge for hobbyists, makers, and small-scale engineers. These 0.9mm wire diameter A2 stainless steel compression springs are sized for precision applications where a standard hardware-store spring simply won't do — sold in a convenient pack of 10 so you always have a spare on hand.
Each spring is cold-coiled from A2 (304) stainless steel wire with a diameter of 0.9mm (approx. 0.035 in). Outer diameters span 6mm to 16mm (approx. 0.24 in to 0.63 in) and free lengths range from 10mm to 50mm (approx. 0.39 in to 1.97 in), giving you a broad matrix of sizes to match your exact bore and travel requirements. End coils are closed and ground for flat, stable seating.
Typical use cases include 3D-printer extruder tensioners and bed-levelling assemblies, RC car suspension and throttle-return mechanisms, electronic switch and button return springs in custom enclosures, and light-duty valve or latch mechanisms in DIY automation projects.
Cold-coiled from 304-grade stainless wire for reliable corrosion resistance in humid, outdoor, or light chemical environments without surface treatment.
OD 6–16mm × Length 10–50mm in a single SKU family — select the exact combination you need from the variant dropdowns above.
Flat, parallel end coils ensure even load distribution and stable seating in bored housings or against flat surfaces — no rocking or canting under compression.
Uniform wire diameter and coil pitch deliver repeatable deflection characteristics, important for tensioners, switches, and any application requiring predictable return force.
Ten identical springs per order — enough for a full build with spares for prototyping, testing, or future repairs without reordering.
Compact dimensions suit 3D-printed assemblies, RC vehicles, electronic enclosures, and light mechanical linkages where space is at a premium.
| Material | A2 Stainless Steel (304) |
|---|---|
| Wire Diameter | 0.9 mm (approx. 0.035 in) |
| Outer Diameter (OD) | 6 mm – 16 mm (approx. 0.24 in – 0.63 in) |
| Free Length | 10 mm – 50 mm (approx. 0.39 in – 1.97 in) |
| End Type | Closed & Ground |
| Spring Type | Compression |
| Quantity per Pack | 10 pieces |
| Finish | Natural (uncoated stainless) |
| Spring Rate | See variant options |
| Max Load | See variant options |
Measure the bore or housing inner diameter (ID) your spring must fit inside — the spring OD should be 0.5–1mm smaller than the bore ID to allow free movement. For free length, choose a spring that is longer than your required compressed length plus your desired travel (stroke). Use the variant dropdowns above to select your OD (6–16mm) and free length (10–50mm).
A 0.9mm wire spring is suited to light-duty applications — typically tensioners, return springs, button mechanisms, and small latches. Exact load capacity depends on the OD and free length of the specific variant. For heavy-duty clamping or industrial loads, a larger wire diameter is recommended.
A2 (304) stainless steel offers good corrosion resistance in most outdoor and humid environments. It performs well against rain, moisture, and mild atmospheric exposure. For marine or highly saline environments, A4 (316) stainless steel would be a more suitable choice.
Yes. The compact OD range (6–16mm) and short-to-medium free lengths (10–50mm) make these springs well-suited for 3D-printed extruder tensioners, bed-levelling clips, and enclosure latches. Ensure your printed bore is sized 0.5–1mm larger than the spring OD for a smooth fit.
Closed and ground ends have the final coils wound tightly together and then ground flat, creating a stable, perpendicular seating surface. This prevents the spring from tilting under load and distributes force evenly. Open-end springs lack this flat seat and are more prone to buckling in precision bores — making closed & ground ends the preferred choice for most DIY and mechanical applications.
Yes. The 0.9mm wire diameter and OD range of 6–16mm are commonly used in 1/10 to 1/18 scale RC suspension, throttle-return, and steering-return mechanisms. Select the OD and length that matches your shock tower bore and desired suspension travel.
Each order includes 10 identical compression springs of the size you select. This gives you enough for a complete build plus spares for prototyping or future repairs.
