Technical Specification Flange bolts are partially and fully threaded depending on size and length. The point for hex types is chamfered or rounded; for 12 point, it's flat and chamfered. Typical sizes for hex range from 3/8" to 3/4"; #10 to 1/2" for serrated hex; and 1/4" to 1" in diameter for 12 point. Features Hex Flange Bolt features a ridge around its head to distribute clamping load during the tightening process. The main reason for using this bolt is to protect joint surfaces of wood & metal from impacts and load. Standards DIN 6921
