Din 6921 flange bolts
The flange bolt is composed of hexagon head and flange plate (the gasket under the hexagon and the hexagon is fixed together) and the screw (cylinder with external thread). It needs to be matched with the nut to fasten the parts connecting the two through holes. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.
Apply metric coarse and fine thread grade a hexagonal flange bolts with thread diameter of 5-20mm.
Material, carbon steel
Thread tolerance: 6g
Property grade: carbon steel (DIN ISO 898) 8.810.912.9
Tolerance requirements: a according to DIN ISO 4759
Surface form: blackening treatment (heating or chemical), surface roughness according to din267, permissible surface defects according to din267, hot dip galvanizing according to din267
Detection and test methods: hardness test, tensile test, impact test, decarburization test, surface defect inspection, chemical analysis, measuring tool test, torque coefficient test, salt spray test
Hexagon flange bolt is widely used in industry because of its precise decoration, strong endurance and other characteristics. It is widely used in highway and railway bridges, including industrial and civil buildings, cranes, excavators and other heavy machinery.