Compression Spring 6mm -20mm Diameter & 305mm Length Pressure Small Various Size

Match the outer diameter (OD) to your spring housing bore — the OD should be slightly smaller than the bore for clearance fit. Then select the wire diameter based on the load you need: a thicker wire (e.g., 1.8mm) produces a stiffer spring with higher load capacity, while a thinner wire (e.g., 1mm) gives a softer, lower-force spring. If you are replacing an existing spring, measure the OD, wire diameter, and free length of the original.

Yes. Carbon spring steel can be cut with an angle grinder or spring cutter. After cutting, lightly grind the cut end flat so it seats properly. Note that cutting changes the spring rate and load characteristics — the shorter the spring, the stiffer it becomes for the same wire and OD combination. Plan your cut length based on your required compressed and free-length travel.

These springs are made from uncoated carbon spring steel, which provides good mechanical properties but limited corrosion resistance on its own. For outdoor, humid, or wet environments, we recommend applying a light coat of oil or grease, or using a protective spray after installation. For applications requiring inherent corrosion resistance, consider stainless steel springs instead.

The inner diameter is calculated as: ID = Outer Diameter − (2 × Wire Diameter). For example, a 1mm wire / 10mm OD spring has an ID of approximately 8mm. Use this to verify shaft clearance — your guide shaft or rod should be smaller than the ID to allow the spring to compress freely without binding.

The number of active coils is not individually listed per variant, but for a 305mm free-length spring the coil count is typically in the range of 50–150 active coils depending on wire diameter and pitch. More active coils generally mean a lower spring rate (softer feel). If coil count is critical for your design, contact us to confirm before ordering.

Yes — these are a common choice for CNC axis return preload, tool-changer mechanisms, and robotics joint assemblies. Select the OD that fits your housing and the wire diameter that delivers the preload force your design requires. The 305mm length gives you flexibility to cut to the exact working length needed for your travel range.

Yes. When you select a size (wire diameter × OD × length) and then choose 5 Pcs or 10 Pcs, all pieces in the pack are identical to that selected size. Packs are a cost-effective way to stock spares or fulfill small production runs without ordering individually.