Halder | 22540 Series | Grub Screw DIN 6332 with Thrust Point22540. 0423 Grub Screw DIN 6332 with thrust point Grub screws are clamping screws that can directly transmit forces via the thrust point. The pressure surface of the thrust point of the steel version is hardened. For clamping sensitive surfaces, thrust pads EH 22560. (DIN 6311 and low version) can be attached on the thrust point. The snap ring of the thrust pad achieves a connection between the grub screw and the thrust pad that can be released by