With high strength steel, or the need to impose a large pre tightening bolts, can be called high strength bolts. High strength bolt for bridge, rail, high pressure and ultra high pressure equipment. The fracture of the bolt is brittle fracture. High strength bolts applied to the ultra high pressure equipment, in order to ensure the sealing of the container, the need to impose a greater prestress.
Friction type high strength bolt is connected to beams and columns of steel frame structure, solid web beam connection, industrial plant of heavy crane beam is connected, braking system and bear important structure of dynamic load of the connection.
Bearing type high strength bolt: can be used to allow the generation of a small amount of sliding structure or indirectly bear dynamic load of the components in the shear connection.
Tensile type high strength bolt: bolt tension, fatigue strength is low, in under the action of dynamic load, its carrying capacity is not easy to more than 0.6P (P bolt allowable axial force). Therefore, only for used in static loads, such as compression member blue docking, T type joints.