Spring steel compression springs with diameter of 12-80mm and a length of 70mm.

Measure the inner diameter of the housing or bore the spring will sit in, then select an outer diameter (OD) that is 1–2mm smaller than the bore for a sliding fit. If the spring rides on a guide rod, the inner diameter (ID = OD minus 2× wire diameter) should be at least 0.5mm larger than the rod. Use the variant selector to match your required OD from the 12–80mm range available.

Spring steel (typically 65Mn or equivalent) offers a good balance of elasticity and load capacity for general indoor mechanical applications. Stainless steel variants resist oxidation and are suitable for humid, wet, or mildly corrosive environments such as food equipment, marine accessories, or outdoor fixtures. Nickel-plated spring steel provides a decorative and mildly corrosion-resistant surface for applications where appearance matters.

Load capacity depends on the wire diameter and outer diameter combination selected. Thicker wire diameters (e.g., 4–5mm) with smaller outer diameters produce stiffer springs with higher load ratings, while thinner wire (2–2.5mm) with larger ODs produce softer springs. Specific spring rate and load data for your chosen variant can be confirmed by contacting us with your selected Length × Wire Diameter × OD combination.

Standard spring steel variants are not recommended for prolonged outdoor or wet exposure without additional protection. For corrosion resistance, select the stainless steel variants, which are suitable for damp or mildly corrosive environments. The nickel-plated option adds a surface barrier but is not equivalent to full stainless steel corrosion resistance. For highly corrosive environments, contact us to confirm suitability.

Yes. The 70mm free length and wide OD range (12–80mm) make these springs well-suited for linear actuator return mechanisms, gripper tension elements, and sensor-mounting preload applications in robotics and automation. Select the wire diameter that matches your required spring rate — thinner wire for low-force sensing applications, thicker wire for actuator return forces.

For a single repair or initial prototype, the 1-piece or 2-piece packs allow you to test fit and function before committing to larger quantities. The 4-piece and 5-piece packs offer better per-unit value for small production runs, jig builds, or when you need spares on hand. Select your preferred quantity in the Material Selection & Qty option when choosing your variant.

You need three measurements from your existing spring or housing: free length (should be 70mm), outer diameter (match to your bore clearance), and wire diameter (affects spring rate and ID clearance over a guide rod). Cross-reference these with the variant options available. If you are unsure, contact us with your measurements and we can help identify the correct variant.