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When a worn or mismatched spring causes inconsistent press force, mould misalignment, or premature tooling failure, the cost adds up fast. Engineers, toolmakers, and maintenance technicians who work with stamping dies, injection moulds, and precision jigs need springs they can spec by load rating — not guess at. These compression die mould springs are color-coded by duty class so you can identify and replace the right spring without measuring deflection curves every time.
Each spring is a cylindrical compression coil spring manufactured from high-carbon spring steel wire. Available in three outer diameter sizes — 14mm (inner dia 7mm), 16mm (inner dia 8mm), and 18mm (inner dia 9mm) — with lengths ranging from 20mm to 200mm (approximately 0.79 in to 7.87 in). Five load ratings are offered: Yellow TF (lightest duty), Blue TL (light duty), Red/Rot TM (medium duty), Green TH (heavy duty), and Brown TB (super heavy duty).
Typical applications include die and mould stripping springs in metal stamping presses, return springs in injection mould ejector plates, compression elements in fixture clamps and jig assemblies, and replacement springs in industrial machinery maintenance. Long-tail use cases: "14mm OD die spring replacement," "colour-coded mould spring set," "18mm compression spring for stamping die."
| Spring Type | Cylindrical Compression Coil Spring |
|---|---|
| Material | High-Carbon Spring Steel |
| Outer Diameter (OD) | 14mm / 16mm / 18mm (see variant options) |
| Inner Diameter (ID) | 7mm / 8mm / 9mm (matched to OD) |
| Free Length | 20mm – 200mm (see variant options) |
| Load Rating / Colour Code | Yellow TF (Lightest) / Blue TL (Light) / Red TM (Medium) / Green TH (Heavy) / Brown TB (Super Heavy) |
| End Type | Closed and ground ends (typical for die springs) |
| Surface Treatment | Corrosion-resistant coating |
| Application | Die & mould tooling, stamping presses, ejector plates, fixture clamps |
| Quantity | 1 piece per order |
| Wire Diameter | See variant options |
| Spring Rate | See variant options |
The colour indicates the spring's stiffness class. Yellow TF is the lightest (lowest force per mm of deflection) and Brown TB is the stiffest (highest force). Match the colour to the load rating specified on your die or mould drawing. If no drawing is available, replace like-for-like using the colour already installed. When designing from scratch, calculate the required spring force at working deflection and select the colour class whose spring rate meets that requirement within 20–30% of maximum deflection.
Measure the pocket (counterbore) diameter in your die or mould plate — the OD of the spring must fit inside with a small clearance (typically 0.5–1mm per side). Then check that the guide pin or ejector pin diameter is smaller than the spring's inner diameter (ID) with similar clearance. For example, a 14mm OD / 7mm ID spring suits a pocket of approximately 15–16mm diameter with a guide pin up to 6mm diameter.
The free length is the uncompressed length of the spring. It should be long enough so that at maximum working deflection the spring still exerts the required force, but short enough to fit within the available pocket depth when the die is closed. A common rule of thumb is to select a free length approximately 1.3–1.5× the required working length, keeping deflection within 30% of free length for fatigue life. Measure your existing spring or refer to your die design specification.
Yes, die mould springs of this type are designed for repetitive cyclic loading. Fatigue life depends on the deflection ratio — keeping deflection below 30% of free length (light pre-load) extends service life significantly compared to operating near maximum deflection. For very high-cycle applications (millions of strokes), stay within the recommended deflection range and inspect springs periodically for set (permanent shortening) or cracking.
The springs carry a protective surface coating suitable for typical indoor workshop and light industrial environments with normal humidity. They are not intended for continuous immersion in water, exposure to strong acids or alkalis, or outdoor weathering. If your application involves coolant spray or high-humidity conditions, inspect springs more frequently and replace at the first sign of surface rust, which can initiate fatigue cracks.
These springs follow the colour-coded load class convention used in ISO 10243-style die springs. Verify that the OD, ID, and free length match your existing spring before ordering. If your current spring has a manufacturer's part number, cross-reference the OD × ID × free length × colour to confirm compatibility. Dimensional fit is the primary compatibility criterion.
Each order is for one (1) spring. Select your required colour, outer diameter × inner diameter, and length from the variant dropdowns, then adjust the quantity in your cart to order multiple pieces of the same specification.
