OD 50mm/ID25mm Dia Springs Compression Mould Spring Light/Medium/Heavy Load Duty

Select a free length that is approximately 20–30% longer than your required working length. This ensures the spring operates within its recommended deflection range and avoids coil bind. For example, if your mould stroke is 40mm, a free length of 50–60mm is typically appropriate. Refer to your tooling drawing for the spring pocket depth and maximum allowable deflection.

Yellow springs are light load grade, delivering lower force per unit of deflection — suitable for delicate stripping operations or applications where excessive force could damage the workpiece. Red springs are heavy load grade, providing significantly higher spring force for robust stripping, clamping, or return functions in demanding tooling environments.

The 25mm inner diameter accommodates guide pins up to approximately 23–24mm in diameter, allowing a small clearance for smooth travel and thermal expansion. Always verify the actual ID tolerance of the specific spring you receive against your guide pin diameter before installation.

These springs are manufactured from alloy steel and include a surface treatment to provide basic corrosion protection under normal indoor industrial conditions. For environments with exposure to coolants, cutting fluids, or high humidity, additional protective measures such as periodic lubrication or a corrosion-inhibiting coating are recommended to extend service life.

Yes. These mould springs are designed specifically for injection mould and stamping die applications. They are commonly used as ejector return springs, stripper plate springs, and core pull return springs. Ensure the selected load grade and free length match your mould design specifications for optimal performance.

Each order includes 1 piece per variant selected. If you require multiple springs for a multi-cavity mould or symmetrical tooling layout, simply adjust the quantity in your cart or contact us to discuss bulk pricing options.

Replace the spring if you observe a measurable reduction in free length (set loss), inconsistent ejection or stripping force, visible cracking or surface damage, or if the spring has exceeded the manufacturer's recommended cycle count. Proactive replacement during scheduled maintenance intervals is recommended for high-volume production tooling.