Recommended torque for jaw screws

Recommended torque for jaw screws should be applied while tightening the top jaws with master jaws.

Use screws of reputed make only. (Eg. TVS, Unbrako). Length of the screw should be as per GMT standards. Write to esales@gmt.co.in for a free electronic copy of GMT PHNC Instruction Manual.

RECOMMENDED TORQUE

                          SCREW SIZE                                                      TIGHTENING TORQUE

                                        M8                                                                         39 Nm

                                       M10                                                                        77 Nm

                                       M12                                                                       110 Nm

                                       M16                                                                       220 Nm

                                      M 20                                                                       400 Nm


Important Instructions:
If you use screws that are  longer than recommended size, the top jaw will not clamp with master jaw, as the clamping screw will rest at the bottom face of master jaw T-Slot. This will result in master jaw breakage.If the soft-jaws are purchased from outside source, ensure that the jaws meet GMT standards.

Click here for further information and instructions on chuck maintenance. or visit our website www.gmt.co.in