The hook surface should be smooth and must not be stripped, cracked, nicked or cracked. The hook should be checked once a year and should be stopped immediately if a crack is found.
Connection hook needed for processing the trapezoidal thread for taking into account the shape of the hook itself, should take the raw part of the trapezoidal thread center as the base to find axis in the hook, then welding a clip on it (shape is hexahedral) in drilling or boring machine bed, crossed central hole drilling and with the four jaw independent chuck clamp top clamping, can meet the processing requirements.
The turning of the hook requires drilling the center hole on the drill machine, turning the threaded part with a clip on a lathe, and connecting the head with the threaded part.
Previous: How much do you know about the hook set?