Free Engineering Tool
Clamp Force Calculator
Determine the required clamping tonnage for your injection molding machine based on projected area, material properties, and number of cavities.
Enter Your Parameters
Total area of the part as seen from the clamp direction
Understanding Clamp Force
Why It Matters
Insufficient clamping force causes flash (excess material at the parting line) and dimensional issues. Too much force wastes energy and can damage the mold. Getting the right balance is essential for quality parts and efficient production.
Factors That Increase Force
- • Thin walls (require higher injection pressure)
- • Long flow paths relative to wall thickness
- • High viscosity materials (PEEK, PEI, glass filled)
- • Tight tolerances requiring higher pack pressure
- • Multiple cavities (total projected area increases)
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