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When your mechanism demands reliable return force in a space measured in millimeters, an undersized or poorly toleranced spring becomes the weakest link in the entire assembly. Engineers, hobbyists, and precision instrument makers who work with micro-scale mechanisms need miniature compression pressure springs that hold their rated geometry under repeated cycling without corroding or fatiguing prematurely.
Each pack contains 10 miniature compression springs manufactured from A2 stainless steel (austenitic, equivalent to 304-grade). Wire diameter ranges from 0.1 mm to 0.15 mm (approx. 0.004–0.006 in), outer diameter from 0.8 mm to 1.5 mm (approx. 0.031–0.059 in), and free length from 5 mm to 25 mm (approx. 0.20–0.98 in) depending on the variant selected. The close-wound coil geometry provides consistent spring rate across the compression stroke.
Typical use cases include miniature camera shutter mechanisms requiring sub-millimeter return springs, precision pen and stylus clip assemblies where a 1 mm OD compression spring for pen mechanisms fits without modification, and micro-robotics or sensor housings where a stainless steel miniature coil spring for electronics must resist moisture and mild chemical exposure over thousands of cycles.
| Material | A2 Stainless Steel (Austenitic / 304-equivalent) |
|---|---|
| Spring Type | Compression (Helical Coil) |
| Wire Diameter | See variant options (0.1 mm / 0.15 mm) |
| Outer Diameter (OD) | See variant options (0.8 mm – 1.5 mm) |
| Free Length | See variant options (5 mm – 25 mm) |
| Quantity per Pack | 10 pcs |
| Coil Direction | Right-hand (typical; contact us to confirm) |
| End Type | See variant options |
| Surface Finish | Natural (no coating) |
| Corrosion Resistance | Good — suitable for humid and mildly corrosive environments |
| Operating Temperature | Typically –20 °C to +300 °C (–4 °F to +572 °F) |
| Spring Rate | See variant options |
Wire diameter directly affects spring rate and load capacity. The 0.1 mm wire produces a softer spring with lower force at a given deflection, suitable for very light-load applications such as stylus clips or sensor contacts. The 0.15 mm wire is stiffer and handles slightly higher loads. If your design specifies a target load at a defined compressed length, calculate the required spring rate and select the wire diameter that matches. When in doubt, order both and test — the 10-piece pack makes this practical.
The spring's outer diameter should be slightly smaller than the inner diameter of the bore or housing it sits in — typically 0.05–0.1 mm clearance on each side. For a guided pin, the inner diameter of the spring (OD minus twice the wire diameter) should be slightly larger than the pin. Available ODs range from 0.8 mm to 1.5 mm, covering most miniature precision housings. Measure your bore with a calibrated micrometer before ordering.
At this micro scale (wire dia 0.1–0.15 mm, OD 0.8–1.5 mm), the springs are designed for light-duty precision applications rather than heavy mechanical loads. Typical working loads range from a few grams-force to tens of grams-force depending on the specific wire diameter, OD, and free length combination. For exact load-deflection data for a specific variant, please contact us with your variant selection and we will provide the spring rate estimate.
Yes. A2 stainless steel (austenitic grade, 304-equivalent) provides good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is not recommended for prolonged immersion in chloride-rich environments such as seawater or swimming pool water, where A4 (316-grade) stainless would be more appropriate. For indoor precision instruments, electronics, and general mechanical assemblies, A2 performs reliably without surface coatings.
Yes. The natural (uncoated) A2 stainless steel surface does not introduce plating chemicals or organic coatings that could outgas or contaminate sensitive optical or electronic components. The material is non-magnetic in its annealed state, which is beneficial in magnetically sensitive environments. Always verify the specific magnetic permeability requirement of your application, as cold-working during forming can induce slight magnetism in austenitic stainless.
Free length is the uncompressed length of the spring. Your design's working length (compressed length under load) plus the required deflection equals the minimum free length needed. Add a safety margin of 10–20% to avoid coil bind. Available free lengths are 5, 8, 10, 12, 15, 20, and 25 mm. If your required free length falls between two options, select the next longer size and adjust your assembly's spring seat depth accordingly.
Yes. All 10 springs in a single pack share the same wire diameter, outer diameter, and free length as specified by the variant you select. They are produced from the same material batch and coiling run, making them suitable for matched-set applications such as multi-axis sensor preloads or parallel spring arrays where consistent force distribution is important.
