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Contact SupplierCollet nuts are designed to collapse with 1mm or .039. Never try to install a cutting tool with a larger shank than the maximum or nominal diameter of the collet to expand the collet. For example: If the cutting tool shank is 4.2mm a 4-3mm is not suitable. A 4.5-3.5mm collet would be required. Sealed Collets for coolant through applications do not have a collapse range, and must be used at exact size. Maximum tightening torque for ER40 Collet is 90 ftlbs.