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DA tool holder nuts: tightening torque?

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  • DA tool holder nuts: tightening torque?

    Has anyone seen a comprehensive torque spec. chart for the DA collet series?
    Does anyone here use specific torque figures for their DA tooling?

    My searching led me to Kennametal's technical catalog section. Erickson, I understand, originated the DA series and is currently a subsidiary of Kennametal. Specifically, I have 100DA series tooling utilizing the 08 style nut. The Erickson/Kennametal technical section lists a single, max tightening torque of 55 lbs-ft (~75 Nm). Considering that 100DA encompasses tool holding diameters from 3/64" to 9/16", a single figure is suspect. For example, ER collets have charts with varying torque figures based on holding diameter, length of holding bore*, and type of collet**.

    *small bore sizes are relieved in the back; large bore sizes are the full length.
    **standard, coolant sealed, end-mill or tap specific, etc.