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When a project demands consistent return force in a compact space — whether you're repairing a pen mechanism, building a custom jig, or assembling a small electronic device — finding the right spring matters. These 1mm wire diameter compression springs are designed for makers, hobbyists, and engineers who need dependable elastic performance in tight tolerances.
Each spring is formed from carbon steel wire with a nominal wire diameter of 1.0mm (0.039 in). Outer diameters span 5mm to 20mm (0.20 in – 0.79 in), and free lengths range from 10mm to 100mm (0.39 in – 3.94 in). Sold in packs of 5 or 10 pieces depending on the selected length variant.
Typical use cases include small appliance repair requiring a 1mm wire compression spring replacement, DIY electronics enclosure latching mechanisms, and prototype mechanical assemblies where a compact coil spring with controlled spring rate is needed.
Consistent 1.0mm wire cross-section across all variants for predictable spring rate and load characteristics in compact assemblies.
Outer diameters from 5mm to 20mm and free lengths from 10mm to 100mm let you match the exact spring geometry your application requires.
Wound from carbon steel wire for solid structural integrity and consistent elastic return under repeated compression cycles.
Shorter lengths (10–50mm) ship in 10-piece packs; longer lengths (60–100mm) ship in 5-piece packs — ideal for prototyping and repair stock.
End coils are closed to provide a flat seating surface, ensuring stable axial alignment when installed in a bore or over a guide rod.
Uniform coil pitch throughout the active length delivers consistent deflection behavior and repeatable performance across the pack.
| Wire Diameter | 1.0mm (0.039 in) |
|---|---|
| Outer Diameter Range | 5mm – 20mm (0.20 in – 0.79 in) |
| Free Length Range | 10mm – 100mm (0.39 in – 3.94 in) |
| Material | Carbon Steel |
| Spring Type | Compression (closed ends) |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Pack Quantity | 5 pcs (60–100mm) / 10 pcs (10–50mm) |
| Coil Direction | Right-hand wound |
Measure the bore (hole) or housing your spring will sit inside. The spring's outer diameter should be 0.5–1.5mm smaller than the bore to allow free movement without binding. If the spring goes over a guide rod, the inner diameter (outer diameter minus 2× wire diameter) must clear the rod with a small gap.
Load capacity depends on the outer diameter, free length, and number of active coils. A 1mm wire spring is suited for light-duty applications — typically in the range of a few hundred grams to a few kilograms of force at working deflection. For exact load values, contact us with your required deflection and outer diameter.
These springs are made from carbon steel and offer moderate corrosion resistance suitable for indoor and dry environments. For humid, wet, or outdoor applications, consider stainless steel springs or apply a protective coating after installation.
Many standard ballpoint pen mechanisms use springs with outer diameters in the 5–7mm range and lengths of 10–30mm. Select the variant that matches your measured spring dimensions. We recommend measuring your original spring before ordering.
Free length is the spring's natural, unloaded length listed in the variant name. Compressed (solid) length is the minimum height when all coils are touching. Working deflection should stay well above solid height to avoid permanent set. As a conservative rule, do not compress beyond 80% of free length for repeated cycling.
Yes. The smaller OD variants (5–8mm) are commonly used in battery contacts, button mechanisms, and PCB test fixtures. Ensure the spring's outer diameter and free length match your PCB footprint and travel requirements. Carbon steel springs are not recommended for environments with high humidity or chemical exposure.
Shorter springs (10–50mm free length) are sold in 10-piece packs, while longer springs (60–100mm) come in 5-piece packs. If you need a specific quantity for a production run or bulk project, contact us to discuss volume options.
