Compression Spring Various Size 2mm-30mm Diameter & 305mm Length Pressure Small

Start with the outer diameter: it must fit inside your spring pocket or around your guide rod with a small clearance (typically 0.5–1 mm). Then choose the wire diameter based on the load you need — a thicker wire produces a stiffer spring with a higher spring rate. For light-duty electronics or switch applications, 0.3–0.6 mm wire is typical; for robotics actuators or mechanical returns, 1–2 mm wire is more appropriate.

Load capacity varies significantly by wire diameter and outer diameter combination. Finer wire (0.3–0.5 mm) springs are suited for light loads in the range of a few grams to a few hundred grams. Heavier wire (1.5–2 mm) springs with larger outer diameters can handle loads in the kilogram range. For exact spring rate and load data for a specific variant, please contact us to confirm.

These springs are made from carbon steel, which is not inherently corrosion-resistant. They are best suited for dry indoor environments. For humid, wet, or outdoor applications, consider applying a light coat of oil or grease, or contact us about stainless steel alternatives. Prolonged exposure to moisture without protection will cause surface rust.

Yes. The 305 mm free length is intentionally long to give you flexibility. You can cut the spring to your required working length using a rotary tool or spring cutter. Note that cutting will leave an open, unground end — if a flat seating surface is critical, you may need to grind the cut end flat after cutting.

Yes, as long as you match the inner diameter of the spring to your guide rod diameter. The inner diameter equals the outer diameter minus twice the wire diameter. For example, a 10 mm OD spring with 1 mm wire has an inner diameter of approximately 8 mm. Verify this clearance before ordering to ensure the spring slides freely on the rod without binding.

All quantity options are the same spring — only the number of pieces per order differs. Ordering in larger quantities (5 or 10 pcs) provides a lower per-unit cost and ensures you have spares on hand for prototyping, testing, or replacement. The 1-piece option is ideal for single-build projects or initial fit checks.

These springs are widely used in robotics return mechanisms, 3D printer bed leveling assemblies, electronic push-button switches, valve and plunger mechanisms, small appliance components, model engineering, and general mechanical DIY projects. The wide size range makes them versatile across hobby and light industrial applications.

Spring rate (k) for a helical compression spring is calculated as: k = (G × d⁴) / (8 × D³ × n), where G is the shear modulus of the material, d is the wire diameter, D is the mean coil diameter, and n is the number of active coils. For carbon steel, G ≈ 79,000 MPa. If you need a pre-calculated spring rate for a specific variant, contact us with your wire diameter and outer diameter selection.