Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a standard off-the-shelf spring leaves your mechanism binding, rattling, or failing under repeated load cycles, the root cause is almost always a mismatch in wire diameter, outer diameter, or free length. Engineers, machinists, and hands-on DIYers who need a 1mm wire diameter compression spring in a specific outer diameter and length will find this listing covers the full practical range — OD 6mm through 20mm (approx. 0.24" to 0.79") and free lengths from 10mm to 305mm (approx. 0.39" to 12").
Each spring is formed from Grade A2 (AISI 304) stainless steel wire with a nominal wire diameter of 1mm (0.039"). Outer diameters span 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, and 20mm. Free lengths range from 10mm up to 305mm. Springs are available in packs of 1, 2, 5, or 10 pieces depending on the size selected.
Typical applications include small appliance mechanisms requiring a 1mm wire stainless compression spring, precision instrument return springs, electronics enclosure latches needing a corrosion-resistant miniature compression spring, automotive sensor assemblies, and light-duty valve or plunger return applications where a 304 stainless steel coil spring with controlled deflection is required.
Resists oxidation, mild acids, and humid environments — suitable for indoor and light outdoor use without surface treatment.
Uniform 1mm wire cross-section across all OD options ensures predictable spring rate and repeatable deflection behaviour.
Thirteen outer diameter options (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 20mm) cover the majority of small-mechanism spring seats.
Nineteen length options per OD group let you match the required travel and solid height without custom tooling.
Order 1, 2, 5, or 10 pieces per variant — ideal for prototyping single units or stocking a small batch for production runs.
End coils are typically closed to provide a flat seating surface, improving load distribution and reducing lateral buckling tendency.
| Material | Stainless Steel A2 / AISI 304 |
|---|---|
| Wire Diameter | 1mm (0.039") |
| Outer Diameter (OD) | 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 18 / 20mm — see variant options |
| Free Length | 10 – 305mm (0.39" – 12.0") — see variant options |
| Inner Diameter (ID) | See variant options |
| Spring Rate | See variant options |
| End Type | Closed (typically closed & ground for this wire class) |
| Finish | Natural stainless (no coating) |
| Pack Quantity | 1pc / 2pc / 5pc / 10pc — see variant options |
| Operating Temperature | Typically –20°C to +300°C (–4°F to +572°F) for A2 304 |
Measure the bore or housing that the spring sits inside, then select an OD 0.5–1mm smaller than the bore to allow free movement without binding. If the spring slides over a shaft, select an ID (inner diameter) at least 0.5mm larger than the shaft. Contact us with your bore and shaft dimensions if you need confirmation before ordering.
Load capacity depends on the OD, free length, and number of active coils — all of which vary by variant. As a general guide, 1mm wire A2 stainless springs in this OD range are suited to light-duty applications typically in the range of a few Newtons to tens of Newtons at working deflection. Contact us with your required load and deflection for a specific spring rate estimate.
A2 (AISI 304) stainless steel offers good corrosion resistance in most indoor and mildly humid outdoor environments. It resists rust from water and mild atmospheric exposure. For marine, chloride-rich, or highly acidic environments, A4 (316) stainless would be a more appropriate choice. These springs are not coated, so the natural stainless surface is the corrosion barrier.
AISI 304 stainless steel is widely used in food-processing equipment and is generally considered food-safe for incidental contact. However, these springs are not certified to any specific food, pharmaceutical, or medical standard. If your application requires documented material certification or traceability, please contact us before ordering.
Free length is the uncompressed length of the spring as supplied. Working length is the compressed length under your applied load. The difference between free length and working length is the deflection. Ensure your assembly provides enough travel for the required deflection without compressing the spring to solid height (coil bind), which can damage the spring and the mechanism.
Longer springs (typically 120mm and above) are heavier per unit and are offered in smaller pack quantities to keep entry-level pricing accessible. If you need larger quantities of a specific size, contact us — bulk pricing may be available for orders above standard pack sizes.
Check the three key dimensions: OD (must clear the bore), ID (must clear the shaft), and free length (must fit within your assembly's available space). The variant selector shows OD and free length. For ID confirmation or spring rate data on a specific variant, send us a message with the variant SKU and your application details.
