Spiral Stamping Light Load Compression Mould Spring 15-300mm Long Blue 8-40mm OD

Measure the spring pocket bore in your die plate — that gives you the maximum OD. Then measure your guide pin diameter — that gives you the minimum ID clearance needed. Select the variant whose OD fits the pocket with 0.5–1 mm clearance and whose ID clears the guide pin by at least 0.5 mm. If you are between sizes, choose the smaller OD to avoid binding in the pocket.

Blue designates the light load class per ISO 10243. The load hierarchy from lightest to heaviest is: blue (light) → yellow (medium-light) → red (medium) → green (heavy) → brown (extra heavy). Use blue springs where low ejection or stripping force is needed to avoid marking or distorting delicate parts. Upgrading to a heavier class increases force but also increases solid height and fatigue stress at the same deflection.

For light load mould springs, the recommended maximum working deflection is typically 30–40% of the free length for extended cycle life. Operating beyond 50% deflection significantly reduces fatigue life. Always confirm the rated deflection for your specific size variant before designing your die stroke.

The blue powder-coat finish provides a meaningful barrier against workshop humidity and incidental coolant splash. For continuous immersion or aggressive coolant chemistries, consider adding a light oil coating during maintenance intervals. The finish also makes it easy to visually confirm the correct load class is installed after a spring change.

Yes. Rectangular-wire spiral mould springs are a standard component in both stamping progressive dies and injection mould ejector plates. The key is matching the free length to your ejector stroke plus pre-compression, and ensuring the OD fits the counterbore in the ejector retainer plate. The light load class is particularly suited to small ejector pin backup applications where excessive force would deflect thin pins.

Free length determines how much pre-load and working stroke you can achieve. A longer spring at the same OD gives more total deflection range but requires a deeper pocket. Calculate your required pre-load force and working stroke, then use the spring's load-deflection curve to find the free length that delivers the target force at your installed (pre-compressed) length. If pocket depth is constrained, choose the shortest free length that still provides adequate stroke.

Each order is for one (1) spring. Select the exact outer diameter, inner diameter, and free length combination you need from the variant selectors above. If you need multiple springs of the same or different sizes, add each to your cart separately or adjust the quantity at checkout.