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When a machine vibrates itself loose, a mechanism loses its return force, or a jig needs consistent preload, the weak link is almost always an undersized or corrosion-prone spring. Engineers, makers, and repair technicians who work with compact assemblies need compression springs that hold their rated load cycle after cycle without rusting out. These 304 stainless steel compression springs with a 1.5 mm wire diameter and 12–13 mm outer diameter are sized for exactly those tight-tolerance applications.
Each spring is cold-wound from 304 stainless steel wire with a nominal wire diameter of 1.5 mm (0.059 in) and an outer diameter of either 12 mm (0.472 in) or 13 mm (0.512 in). Free lengths span 10 mm to 200 mm (0.39 in to 7.87 in) across the available size options, with closed and ground ends for flat seating. Spring rate and load capacity vary by length; see variant options for the specific combination you need.
Typical use cases include: electronic enclosure latches and button-return mechanisms where a compact OD is mandatory; automotive sensor brackets and valve assemblies requiring corrosion resistance; DIY robotics and 3D-printer extruder tensioners where repeatable preload matters; and industrial jig fixtures that need a reliable restoring force in humid or washdown environments.
Resists oxidation, mild acids, and humidity — suitable for indoor and light outdoor environments without surface treatment.
1.5 mm (0.059 in) wire diameter provides a consistent cross-section for predictable spring rate across the full range of OD and length options.
Cold-wound coil geometry absorbs and dissipates oscillating loads, reducing transmitted vibration in mounting brackets, enclosures, and machinery bases.
Free lengths from 10 mm to 200 mm (0.39–7.87 in) in a single product family — choose the exact length for your stack height without custom tooling.
Flat end coils seat squarely against mating surfaces, minimizing lateral deflection and ensuring axial load transfer in precision assemblies.
Available in packs of 1, 2, 3, 5, 8, 10, 15, 20, or 30 pieces — order exactly what your project or production run requires.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 1.5 mm (0.059 in) |
| Outer Diameter (OD) | 12 mm (0.472 in) or 13 mm (0.512 in) — see variant options |
| Free Length Range | 10 mm – 200 mm (0.39 in – 7.87 in) — see variant options |
| End Type | Closed and Ground |
| Spring Type | Compression |
| Wind Direction | Right-hand (typical for cold-wound 304 SS) |
| Spring Rate | See variant options |
| Surface Finish | Natural (uncoated stainless) |
| Quantity per Pack | 1 / 2 / 3 / 5 / 8 / 10 / 15 / 20 / 30 Pcs — see variant options |
The SIZE option is formatted as Wire Diameter × Outer Diameter × Free Length (all in mm). Measure the bore or guide rod your spring will seat in: the spring OD should be 0.5–1 mm smaller than the bore, or the guide rod should be 0.5–1 mm smaller than the spring ID. The free length should exceed your required working length by enough to generate the preload force you need. If you are unsure, contact us with your bore diameter, working length, and required load.
Load capacity depends on wire diameter, OD, free length, and number of active coils. A 1.5 mm wire spring in this OD range is suited for light-to-medium duty applications — typically a few Newtons to tens of Newtons depending on the specific length. For exact spring rate and maximum load data for a particular size, please contact us to confirm before ordering for load-critical applications.
304 stainless steel offers good resistance to atmospheric corrosion, humidity, and mild chemical exposure. It performs well in most indoor and sheltered outdoor environments. For marine, coastal, or highly chlorinated environments, 316 stainless steel is generally recommended. These springs are uncoated, so their corrosion resistance comes entirely from the alloy composition.
Yes — the 12 mm and 13 mm OD sizes are commonly used in extruder tensioners, bed leveling assemblies, and lightweight robotic joints. Verify that the free length and compressed length fit your travel range, and that the spring rate matches the force your mechanism requires. The stainless material also resists the heat and humidity typical of enclosed printer enclosures.
These compression springs are suitable for vibration damping applications where a compliant element is needed between a vibrating source and a mounting surface. They work best when the excitation frequency is well above the spring's natural frequency. For critical vibration isolation, pair the spring with a damping element (rubber pad or dashpot) to prevent resonance amplification.
Both share the same 1.5 mm wire diameter and the same free length options. The 13 mm OD variant has a slightly larger inner diameter (approximately 10 mm vs 9 mm), which means it fits over a slightly larger guide rod and has a marginally different spring rate for the same free length due to the larger mean coil diameter. Choose based on your bore or guide rod size.
For prototyping or single repairs, the 1 Pcs or 2 Pcs options let you test fit and function before committing to larger quantities. For small production runs or maintenance stock, the 10–30 Pcs packs offer a lower per-unit cost. Select the QTY(pcs) variant that matches your project volume.
