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When a mechanism fails because a spring loses tension or collapses under load, the root cause is often a mismatch between wire diameter, outer diameter, and free length. Engineers, machinists, and hands-on DIYers who need a reliable 3mm wire diameter compression spring with a specific OD and free length will find this listing covers an unusually wide selection — 21 outer diameters from 16mm to 40mm (0.63" to 1.57") and 10 free lengths from 30mm to 100mm (1.18" to 3.94").
Each spring is formed from spring steel (65Mn grade, typically), wound to a consistent pitch with closed and ground ends for flat, stable seating. Wire diameter is 3mm (0.118"), outer diameters range from 16mm to 40mm (0.63"–1.57"), and free lengths span 30mm to 100mm (1.18"–3.94"). Available in packs of 2, 5, or 10 pieces depending on the size selected.
Typical applications include compression spring replacement in industrial machinery, jig and fixture clamping systems, valve return mechanisms, 3D printer bed leveling assemblies, and general mechanical prototyping where a 3mm wire compression spring with controlled OD is required.
Consistent 3mm (0.118") wire cross-section across all size variants for predictable spring rate and load capacity.
OD range from 16mm to 40mm (0.63"–1.57") in 1–2mm increments — find the exact fit for your bore or housing.
Free lengths from 30mm to 100mm (1.18"–3.94") let you match stroke and preload requirements without custom fabrication.
Wound from 65Mn-grade spring steel for consistent elastic return, resistance to set, and durability under cyclic loading.
Flat, ground end coils provide stable, perpendicular seating — reducing lateral deflection and improving load alignment.
Available in 2pc, 5pc, or 10pc packs depending on size — order what you need for prototyping, repair, or production runs.
| Wire Diameter | 3mm (0.118") |
|---|---|
| Outer Diameter (OD) | 16mm – 40mm (0.63" – 1.57") |
| Inner Diameter (ID) | OD minus 6mm (varies by size selected) |
| Free Length | 30mm – 100mm (1.18" – 3.94") |
| End Type | Closed and Ground |
| Material | Spring Steel (65Mn grade) |
| Finish | See variant options |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Pack Quantity | 2pc / 5pc / 10pc (varies by size) |
| Wind Direction | Right-hand |
Measure the bore or housing that will contain the spring. The spring OD should be 0.5mm–2mm smaller than the bore diameter to allow free movement without binding. If the spring rides on a guide rod, the inner diameter (OD minus 6mm for 3mm wire) must clear the rod with at least 0.5mm of play. Select your OD from the variant dropdown above.
Free length is the uncompressed length of the spring. Choose a free length longer than your required working length by the amount of compression travel you need. For example, if your mechanism compresses the spring 20mm and you need 10mm of working length, select a free length of at least 30mm. Available lengths range from 30mm to 100mm in this listing.
Spring rate and load capacity depend on the specific OD and free length combination selected. A 3mm wire diameter spring steel spring is suited for moderate-load applications — typical spring rates for this wire size range from approximately 0.5 N/mm to 5 N/mm depending on OD and length. For exact load data, contact us with your selected variant.
These springs are made from 65Mn spring steel, which offers good mechanical properties but moderate corrosion resistance. For outdoor, wet, or chemically exposed environments, consider applying a light coat of oil or grease, or contact us about availability in stainless steel alternatives. For dry indoor mechanical applications, the spring steel finish is suitable as-supplied.
These 3mm wire compression springs are widely used in industrial machinery, jig and fixture clamping, valve return mechanisms, 3D printer bed leveling, electronics enclosure latches, automotive trim clips, and general mechanical prototyping. The wide OD and length range makes them suitable for replacing standard compression springs in most light-to-medium duty assemblies.
Pack quantity availability varies by size. Larger OD sizes (28mm and above) are typically available in 2pc packs, while smaller ODs (16mm–27mm) are available in 5pc or 10pc packs. If you need a specific quantity for a production run or repair job, select the pack size shown in the Quantity(Piece) variant option. Ordering 10pc packs offers a lower per-unit cost for higher-volume needs.
Yes, provided you match the wire diameter (3mm), outer diameter, and free length to your existing spring. Measure your original spring's OD and free length, then select the matching variant. If your original spring has a different wire diameter, it will have a different spring rate and may not be a direct functional replacement even if the dimensions appear similar.
