Micro Compression Spring Stainless Steel 0.4mm Wire Small Tiny Miniature Repair

Match three dimensions: wire diameter (0.4 mm for this range), outer diameter (must be smaller than your spring pocket inner diameter with a small clearance), and free length (the uncompressed length, which should be longer than your required working length). Select the exact wire × OD × length combination from the variant dropdown above.

Spring rate depends on the specific wire diameter, OD, free length, and number of active coils — all of which vary by size variant. Because this is a broad range of micro springs, individual spring rate data is not listed here. If you need a specific load value, please contact us with your size selection and application details.

Yes. Stainless steel provides good resistance to rust and oxidation in typical indoor and moderately humid outdoor environments. For submersion or highly corrosive chemical exposure, please verify the specific stainless alloy grade meets your application requirements before ordering.

These springs are sized for the micro and miniature range commonly found in retractable pens, push-button switches, and small instrument assemblies. Measure your pocket's inner diameter and required free length, then select the matching variant. The OD of the spring should be slightly smaller than the pocket bore to allow free compression without binding.

Both packs contain identical springs of the same size. The 10-piece pack is suited for single repairs, prototyping, or testing fit before committing to a larger quantity. The 100-piece pack offers a lower per-unit cost and is practical for workshop stock, production batches, or projects requiring multiple replacements.

Stainless steel is electrically conductive, so these springs can function as contact springs in low-current electronic applications such as battery contacts, test probes, and push-button PCB mechanisms. Confirm the current and voltage ratings are within safe limits for your specific circuit before use.

The free length listed in the variant name is the unloaded length. Your working length (compressed under load) will be shorter. Ensure the free length is greater than your required working length, and that the solid height (all coils touching) is less than your minimum compressed length. If you need exact solid height data, contact us with the specific size.