Compression Spring Pressure Springs Wire Dia 0.3 ~ 6mm OD 3 - 50mm Length 300mm

Start with the load you need to support and the space available. A larger wire diameter produces a stiffer spring with a higher spring rate, while a larger outer diameter increases the coil area. For guided applications, the OD should be slightly smaller than the bore or housing ID. For rod-guided setups, the inner diameter (OD minus twice the wire diameter) should clear the rod with a small gap. If you are unsure, order a small quantity of two or three sizes to test fit and feel before committing to a larger batch.

Load capacity varies by wire diameter and OD combination. Thinner wire springs (0.3–0.8 mm wire dia) are suited to light-duty applications such as electronic latches, small sensor returns, and 3D printer bed leveling. Mid-range springs (1–2.5 mm wire dia) handle moderate clamping and tensioning tasks. Heavier springs (3–6 mm wire dia) are appropriate for fixture clamping and mechanical return mechanisms under higher loads. For precise load values, refer to the variant-specific spring rate data or contact us to confirm.

These springs are finished to resist surface oxidation in typical indoor workshop and light-industrial conditions. For outdoor exposure, high-humidity environments, or contact with liquids, additional protection such as a light coating of machine oil or a corrosion-inhibiting spray is recommended. If your application requires stainless steel or a specific plating, please contact us to confirm material availability for the size you need.

Yes. Compression springs can be cut to a shorter free length using a rotary tool or spring cutter. After cutting, the end coil may need to be ground flat to restore a square seating surface. Keep in mind that cutting changes the number of active coils and therefore alters the spring rate — a shorter spring from the same wire will be stiffer. Plan your cut length with this in mind and test the modified spring before final assembly.

Yes, provided you match the OD and inner diameter to your hardware. For rod-guided setups, the rod diameter should be smaller than the spring's inner diameter (OD minus twice the wire diameter) by at least 0.5–1 mm to allow free compression without binding. For bore-guided setups, the OD should be 0.5–1 mm smaller than the bore. Standard spring seats and counterbores sized to the selected OD will seat these springs correctly.

If you are prototyping or testing a new design, ordering 2–3 pieces gives you spares in case of sizing adjustments or accidental over-compression during testing. For a confirmed design going into a small production run, order the quantity that matches your assembly count. The per-piece cost is the same across pack sizes, so the choice is purely about how many you need on hand.

Wire diameter is the thickness of the steel wire used to wind the coil — it directly determines the spring's stiffness (spring rate) and load capacity. Outer diameter is the overall width of the coiled spring — it determines whether the spring fits inside a bore or around a rod. Both dimensions must be matched to your application: the wire diameter for the force you need, and the OD for the physical space available. Selecting the wrong OD can cause binding or misalignment even if the spring rate is correct.