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When a worn or undersized spring causes inconsistent mould ejection, misaligned tooling, or premature part failure, engineers and toolmakers need a dependable replacement they can spec with confidence. These OD 16mm / ID 8mm die springs are designed for hobbyists, machinists, and industrial toolmakers who demand consistent load performance across repeated compression cycles.
Each spring features an outer diameter of 16mm (0.63 in) and an inner diameter of 8mm (0.31 in), with available lengths ranging from 20mm to 300mm (0.79 in to 11.81 in). The colour-coded finish indicates load rating: Yellow (TF) for light load, Blue (TL) for light-medium load, Red (TM) for medium load, Green (TH) for heavy load, and Brown (TB) for extra-heavy load. Springs are sold individually (1pc), in pairs (2pc), or in sets of five (5pc).
Typical use cases include injection mould ejector pin return springs, stamping die stripper plate springs, and custom jig & fixture clamping mechanisms — all scenarios where a consistent, repeatable spring force is critical to part quality and cycle time.
Five distinct colours (Yellow / Blue / Red / Green / Brown) map directly to load class, eliminating guesswork when selecting the correct spring for your application.
Available from 20mm to 300mm (0.79 in – 11.81 in) free length, covering the majority of standard mould and tooling pocket depths without custom fabrication.
16mm outer diameter and 8mm inner diameter maintain consistent fit in standard ISO die spring pockets, reducing installation time and alignment errors.
The rectangular wire profile delivers higher load capacity per unit length compared to round-wire springs of the same envelope, maximising force in compact tooling spaces.
Surface treatment helps resist oxidation in typical workshop and mould-shop environments, extending service life between replacements.
Order as a single piece for a quick repair, a pair for symmetrical tooling layouts, or a set of five for stocking a maintenance kit — all at a per-unit price that scales with quantity.
| Outer Diameter (OD) | 16mm (0.63 in) |
|---|---|
| Inner Diameter (ID) | 8mm (0.31 in) |
| Free Length Range | 20mm – 300mm (0.79 in – 11.81 in) |
| Wire Cross-Section | Rectangular |
| Load Rating / Colour | Light (Yellow TF) / Light-Medium (Blue TL) / Medium (Red TM) / Heavy (Green TH) / Extra-Heavy (Brown TB) |
| Material | Alloy spring steel |
| Surface Treatment | Colour-coded paint / coating per load class |
| Standard Reference | ISO 10243 die spring series |
| Available Quantities | 1pc / 2pc / 5pc |
| Wall Thickness | See variant options |
| Max Deflection Rate | See variant options |
Select based on the required spring force at your working deflection. Yellow (TF) suits light-load ejector returns; Blue (TL) is light-medium; Red (TM) covers medium-load stripper plates; Green (TH) handles heavy clamping; Brown (TB) is for extra-heavy-duty tooling. Always cross-reference the load-deflection curve in your tooling specification before finalising the colour.
Measure the pocket depth and add the required pre-load length. As a general rule, die springs are typically pre-loaded to 10–15% of free length. Choose the next standard length above your calculated requirement from the available sizes (20mm to 300mm).
Yes. The 16mm OD and 8mm ID dimensions conform to the ISO 10243 standard die spring envelope, making them direct replacements for worn springs in most injection moulds, stamping dies, and progressive tooling.
The colour-coded surface coating provides moderate protection against oxidation in typical workshop environments. For applications involving coolant exposure or high humidity, inspect springs periodically and replace if surface rust or pitting is observed, as corrosion can reduce fatigue life.
Die springs are designed for mechanical compression in tooling applications, not as primary actuators in hydraulic or pneumatic circuits. They can be used alongside such systems as return or stripper springs, provided the operating deflection stays within the rated travel for the selected load class.
Order 1pc for a single-position repair or prototype test. Choose 2pc for symmetrical tooling layouts where springs are installed in pairs. The 5pc set is ideal for stocking a maintenance kit or outfitting a multi-cavity mould where several springs of the same spec are required.
Service life depends on operating deflection percentage and cycle rate. Operating at 30% deflection of free length typically yields the longest fatigue life. Exceeding 40–50% deflection significantly reduces cycle count. Replace springs showing set (permanent shortening), cracking, or visible fatigue marks.
