DIN 6304 Screw

DIN 6304 covers a tommy-bar clamping screw with a special fixed lever. The shank has a partial metric thread, with a cylindrical bearing pin at the end. The upper part of the shank has a hole for fitting the lever.

Depending on the design, the lever can be fixed or free. The part is tightened by hand to secure workpieces on a workbench or for other tasks. The thrust point contacts metal parts, so it is hardened for increased strength.

Usage features

This fastener is also called a bench screw: it is used in auxiliary workbench fixtures in locksmith workshops. The DIN 6304 screw is used for clamping workpieces, and it is also used as a clamping element of screw C-clamps.

The fastener has property class 5.8, which corresponds to steel grade 10, 20. Blackening is used for corrosion resistance: the oxide film prevents further oxidation and corrosion. Product sizes per the standard range from 6×40 to 20×110.