The strength grade of flange bolts is selected according to the working pressure. If the working pressure is less than 1Mpa, you can choose grade 4.8, and if it isbetween 1~4.5Mpa, you can choose grade 8.8 high-strength bolts.

Flange bolts are integral bolts consisting of a hexagon head, flange (round washer under the hexagon) and screw (with external thread). It needs to be matched with nut, which is used to fasten part connecting two through holes.

Head of the flange bolt is hexagonal.The bolt consists of hexagon, round disc and threaded rod. The disc surface is serrated, which is anti-skid and anti-loosening. The flange bolt needs to be matched.with nut for fastening work.