16x8mm Light/Heavy Load Spring Stamping Compression Mould Die Spring 20-100mm L

Match the colour grade to your required stripping or ejection force. Yellow/TF is the lightest load and suits thin-sheet blanking or light ejection. Blue/TL and Red/TM cover medium-duty progressive dies. Green/TH and Brown/TB handle heavy-duty stripping in thick-plate or high-tonnage presses. Consult your tooling design specification for the target spring force at working deflection, then select the grade whose load curve intersects that value at your intended stroke.

Measure the depth of your spring pocket and add the required pre-load travel plus working stroke. The free length must be long enough so the spring is still under compression at full open position, but must not exceed the pocket depth when fully compressed (solid height). As a general rule, do not deflect rectangular-wire die springs beyond 30–40% of free length to avoid fatigue failure.

Yes. The 8 mm inner diameter is designed to slide over standard 8 mm guide pins with a close running fit. The 16 mm outer diameter fits pockets bored to 16 mm nominal. Always verify your pocket bore and pin diameter against the spring dimensions before installation.

The surface treatment provides resistance to light oxidation in typical stamping and moulding environments where water-soluble coolant mist or light cutting oil is present. For aggressive aqueous coolants or salt-spray conditions, consider additional protective measures such as periodic re-oiling or a corrosion-inhibiting coating applied in-house.

Yes. These die springs are widely used as ejector-pin return springs in injection moulds. Select a free length that provides adequate pre-load to hold the ejector plate retracted during injection, and a load grade that delivers sufficient return force without exceeding the ejector plate guide clearance. Shorter lengths (20–50 mm) are common in compact moulds; longer lengths (100–300 mm) suit deep-cavity or large-frame tools.

Each pack option contains the stated number of identical springs (same colour grade, same OD×ID, same free length). Ordering multi-packs is more economical per unit and ensures you have matched spares on hand for symmetric die layouts — for example, a four-corner stripping arrangement typically requires four springs of the same specification.

Replace a die spring when you observe any of the following: visible cracking or fracture of coils, a measurable reduction in free length (set) of more than 3–5% from the original, inconsistent stripping or ejection force causing part defects, or when the spring has reached the manufacturer's recommended cycle limit for the deflection ratio used. Proactive replacement during scheduled tool maintenance is recommended for high-volume production dies.