TF/TL/TM/TH/TB Heavy Duty Load Compression Spring Die Springs OD:20mm L:25-150mm

Match the load grade to your required spring force at a given deflection. Yellow (Extra Light / TF) delivers the lowest force per mm of compression and suits light-duty ejector or stripper plate applications. Blue (Light / TL) and Red (Medium / TM) cover mid-range tooling. Green (Heavy / TH) and Brown (Extra Heavy / TB) are for high-force punch returns and heavy-duty die cushions. If you have a force-deflection requirement in Newtons, contact us to confirm the correct grade before ordering.

Measure your die pocket depth (or the available spring cavity length) and subtract the required working deflection. The result is your minimum free length. Choose the next available length above that value from our 25–150 mm range. For example, if your pocket is 60 mm deep and you need 15 mm of deflection, a free length of 75 mm or 80 mm is appropriate.

All springs in this listing have a 20 mm outer diameter. Your spring pocket bore should be at least 20.5–21 mm to allow free movement without binding. Also verify that your guide pin diameter is smaller than the spring's inner diameter to avoid interference. If you are unsure of the ID for a specific grade and length, contact us to confirm before ordering.

Yes. These die springs are manufactured to the ISO 10243 / JIS B 5012 die spring dimensional and load standards, making them interchangeable with other compliant springs of the same OD, length, and load grade. They are suitable for use in standard die sets from major tooling suppliers.

The springs feature a protective surface coating that resists oxidation under typical workshop conditions. They are not rated for continuous immersion in water or exposure to strong acids and alkalis. For wet or highly corrosive environments, consider stainless steel die springs instead. Applying a light machine oil periodically will extend service life in humid conditions.

Yes. Die compression springs are widely used in injection mold ejector plates, stripper plates, and core-pull mechanisms. Select the load grade based on the ejector plate weight and required return force. Red (Medium) and Green (Heavy) grades are most common for ejector applications. Ensure the spring free length and deflection are within the mold's available travel to avoid over-compression, which shortens spring life.

Each variant is available in packs of 1, 2, or 5 pieces. Order a single piece for prototyping or replacement of a single failed spring. Order a pack of 2 for symmetric die sets that use paired springs. Order a pack of 5 for production tooling where you want on-hand spares to minimize downtime during scheduled maintenance.