305mm Length Spring Steel Compression Spring 0.8mm - 1mm Pressure/ Coil Springs

Start with the outer diameter (OD) your housing or bore can accommodate — the spring must fit freely inside the bore with a small clearance. Then select the wire diameter based on the load you need: a thicker wire (1mm) produces a stiffer spring with a higher spring rate, while a thinner wire (0.8mm) gives a softer, more compliant spring. If you are unsure, order a single piece of two or three candidate sizes to test before committing to a larger quantity.

The inner diameter equals the outer diameter minus twice the wire diameter. For example, a 1mm wire / 10mm OD spring has an ID of approximately 8mm. Your guide rod should be slightly smaller than the ID — typically 0.5mm – 1mm clearance — to allow free compression without binding. Check the specific variant dimensions before selecting a guide rod diameter.

These springs are made from spring steel, which provides good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For humid, wet, or outdoor environments, we recommend applying a light coat of machine oil or grease, or using a protective housing. For applications requiring full corrosion resistance, consider stainless steel springs instead.

Yes — spring steel compression springs can be cut to a shorter length using an angle grinder or rotary tool with a cutting disc. After cutting, lightly grind the cut end flat to restore a stable seating surface. Note that cutting changes the spring rate and load capacity, so recalculate or test the modified spring before use in a load-bearing application.

Fatigue life depends on the deflection ratio (how far the spring is compressed relative to its free length) and the applied load. For light-duty DIY and workshop applications operating within 30–50% of the spring's solid height, these springs are suited for thousands of cycles. Avoid compressing to solid height (coil bind) repeatedly, as this accelerates fatigue. For high-cycle industrial applications, consult a spring engineer for a formal fatigue analysis.

Yes, the spring itself is identical regardless of the quantity option you select. The quantity variants (1, 3, 5, 10 pcs) simply determine how many springs are included in your order. Buying in larger quantities offers a lower per-unit cost, which is useful for production builds, spares inventory, or when you need matched springs for multi-spring assemblies.

Yes — these small-diameter compression springs are widely used in 3D-printed mechanisms. When designing your housing, add 0.5mm – 1mm clearance around the OD and ensure the pocket depth is at least equal to the compressed length of the spring under your target load. FDM-printed retainers work well for light loads; for higher loads, consider reinforced or resin-printed parts to prevent deformation at the spring seat.