Compression Spring 5mm Wire Dia Springsteel Pressure Coil Springs All Lengths

Measure the inner diameter of your spring pocket (or the outer diameter of your guide rod). The spring's outer diameter should be slightly smaller than the pocket bore, and the inner diameter (outer diameter minus 2× wire diameter = 30–80 mm OD minus 10 mm = 20–70 mm ID) should be slightly larger than the guide rod. For free length, choose a spring whose free length is longer than your required working length so the spring remains under compression throughout the stroke.

Load capacity depends on both wire diameter and outer diameter. A 5 mm wire is suited to medium-to-heavy loads. Larger outer diameters at the same wire diameter generally produce a softer spring rate (lower load per mm of deflection), while shorter free lengths at the same OD produce stiffer effective rates in practice. For precise load values, contact us to confirm the spring rate for your selected variant.

Spring steel (65Mn or equivalent) provides good mechanical properties but has moderate corrosion resistance. For outdoor, humid, or chemically exposed environments, we recommend applying a light coat of grease or oil, or using a protective sleeve. If your application requires stainless steel springs, please contact us to confirm availability.

Yes — select the outer diameter that matches your pocket bore, then verify the inner diameter (OD − 10 mm) clears your guide rod with a small running clearance (typically 1–2 mm). All springs in this listing share a 5 mm wire diameter, so the inner diameter is predictable across the range.

Absolutely. The 5 mm wire diameter range is well-suited for end-effector preload, gripper return mechanisms, linear actuator return springs, and structural preload in automation frames. The closed-and-ground ends provide stable seating on machined surfaces, which is important for repeatable force application in automated systems.

Many mechanical assemblies use springs in symmetric pairs — dual-spring presses, parallel guide rails, balanced clamping fixtures, and suspension prototypes all benefit from matched pairs. Selling in 2-piece packs ensures you receive a matched set and always have a spare for maintenance without needing to reorder a full batch.

Free length is the spring's uncompressed length as listed in the variant options (30–150 mm). Working length is the compressed length under your applied load. Always select a free length longer than your maximum working length to ensure the spring remains in compression and does not go solid (coil-bound) during operation.