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Engineers and toolmakers working with stamping dies, injection moulds, and precision fixtures know the frustration of springs that creep, fatigue, or deliver inconsistent force — throwing off tolerances and shortening tool life. These OD 35mm × ID 17.5mm die mould compression springs are engineered for repeatable, controlled load delivery across five distinct load grades, letting you match the exact spring force your application demands without guesswork.
Each spring features an outer diameter of 35mm (1.378 in) and an inner diameter of 17.5mm (0.689 in), with free lengths ranging from 30mm to 300mm (1.18 in to 11.81 in). The colour-coded load system — Yellow (Lightest), Blue (Light), Red (Medium), Green (Heavy), and Brown (Super Heavy) — uses a rectangular wire cross-section for higher load capacity per unit length compared to round-wire equivalents. Material is alloy spring steel with a surface treatment for corrosion resistance.
Typical use cases include progressive stamping die strippers, injection mould ejector systems, and industrial automation fixtures requiring consistent return force. Long-travel variants (150–300mm free length) suit deep-draw tooling and multi-stage press applications, while shorter lengths (30–60mm) are ideal for compact die sets and guide-pin assemblies.
Yellow (Lightest) through Brown (Super Heavy) — instantly identify the correct spring for your force requirement without measuring.
Available from 30mm to 300mm (1.18–11.81 in) in 18 increments, covering compact die sets to deep-draw tooling in a single product family.
Delivers higher load density per unit length than round-wire springs of the same OD, reducing the number of springs needed per die station.
Heat-treated alloy steel core with surface coating resists oxidation and wear under repeated cycling in industrial tooling environments.
Tight manufacturing tolerances on OD (35mm) and ID (17.5mm) ensure predictable spring behaviour across the full deflection stroke, cycle after cycle.
35mm OD matches common die-set spring pocket standards; 17.5mm ID clears standard guide pins, enabling straightforward replacement without machining.
| Outer Diameter (OD) | 35mm (1.378 in) |
|---|---|
| Inner Diameter (ID) | 17.5mm (0.689 in) |
| Free Length Range | 30mm – 300mm (1.18 in – 11.81 in) |
| Wire Cross-Section | Rectangular (flat wire) |
| Material | Alloy spring steel |
| Surface Treatment | See variant options |
| Load Grades Available | TF Yellow / TL Blue / TM Red / TH Green / TB Brown |
| End Type | Closed & ground (standard die mould) |
| Coil Direction | Right-hand |
| Application | Stamping dies, injection moulds, automation fixtures |
| Quantity per Order | 1 piece |
Match the load grade to your required spring force at working deflection. Yellow (TF) suits light stripping or ejection forces; Blue (TL) handles moderate loads; Red (TM) covers medium-duty die work; Green (TH) is for heavy stripping and clamping; Brown (TB) handles the highest forces in super-heavy-duty tooling. Calculate your required force (F = k × deflection) and select the grade whose load curve fits within 20–30% of maximum deflection for longest service life.
Choose a free length so that your working deflection is between 20% and 30% of the free length for standard service, or up to 40% for heavy-duty cycles. For example, if your die stroke is 20mm, a free length of 70–100mm is a reasonable starting range. Always verify against the spring's load-deflection curve for your chosen grade.
The 17.5mm ID accommodates guide pins up to approximately 16–17mm in diameter with standard clearance. If your guide pins are larger, these springs will not fit without modification. Confirm your pin diameter before ordering.
These springs follow the common die mould spring dimensional standard (OD 35mm, ID 17.5mm) used widely in tooling. Dimensional compatibility with ISO 10243 or JIS B 5012 springs of the same OD/ID/free-length combination is generally achievable, but load ratings may vary by manufacturer. Always verify the load-deflection data for your specific grade before substituting.
The alloy steel construction with surface treatment provides moderate corrosion resistance suitable for typical indoor tooling environments with incidental coolant exposure. For continuous immersion or highly corrosive environments, additional protective coating or stainless-steel alternatives should be considered.
Service life depends on deflection ratio and load grade. Operating at 20–30% of free length deflection typically yields 1,000,000+ cycles. Exceeding 40% deflection significantly reduces fatigue life. Using the correct load grade for your force requirement — rather than over-deflecting a lighter spring — is the single most effective way to extend service life.
Yes. Springs of the same free length and load grade can be used in parallel (side by side) to multiply total force proportionally. Ensure your die pocket layout provides adequate spacing between spring centres to prevent contact during deflection.
