Big Black High Strength Grade 8.8,10.9 12.9 Outer Hexagon Head Bolt with Hex Nut Assembly

The shape and connection structure of high strength bolts are basically the same as ordinary bolts.The main difference is that the normal bolt connection relies on the shaft pressure and shear resistance to transmit the shear force, while the bolt produces very little preload when tightening the nut.Whatever the impact, the working principle of high strength bolt connection is to deliberately apply a large pre-tightening force to the bolt, so that the contact surface of the connection part produces press pressure, so that there will be a great deal of friction in the direction perpendicular to the bolt.Directional force of screw.The frictional force that transmits the shearing force of the connection.The pre-tightening force of high strength bolts is achieved by tightening the nuts.Common high strength bolts generally adopt torque method and Angle method.The tail of the torsion bolt is used to control the preloading force of the high strength torsion shear bolt.

Bolts connected by high strength bolting are made of 10.9S or 8.8S high quality alloy structural steel and are made by heat treatment.Holes for high strength bolts should be drilled.Diameters of high strength bolts connected by friction are 1.5 ~ 2.0mm larger than nominal diameter D of bolts.The hole diameter of the high strength bolt under pressure connection is 1.0 ~ 1.5mm larger than the nominal diameter D of the bolt

Feature:

Advantage

1. Competitive price; 2. OEM service available

Packing

Bulk in cartons (25kg Max.)+wood Pallet or according to customer special demand

Payment terms

FOB, CIF, CFR, L/C, or others.

Delivery method

by sea, by air or by express service

Application

Structural Steel; Metal Buliding; Oil&Gas; Tower&Pole; Wind  Energy; Mechanical Machine; Automobile: Home Decorating and etc.