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  1. mikedcm

    Torque control of impact wrench

    Assuming that a specific tension or preload in the bolt is the objective rather than a specific torque then an air impact can be calibrated - with a Skidmore or similiar device to apply a torque value consistent with the desired tension by using pressure relief valves in the air line or receiver...
  2. mikedcm

    ASTM A 325N BOLTS

    hastur Structural applications A325 "N" means threads included in shear plane. X means threads excluded from shear plane. Results in different allowable shear values for the bolt. mike

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