1) friction-type connection: friction type high strength bolts is often said that the high-strength bolts in general, based on the powerful clamping force generated when high-strength bolts to compress steel beam, relying on shear transfer and friction between the contact surfaces perpendicular bolt generated direction stress the connection method. (2) pressure-type connector: anti-slip rear bolt tightening force generated and a connecting rod bolt method within the screw and bearing pressure generated between the connecting plate to pass the stress. (3) Tension-type connector: connector after tightening the bolts, the pressure between the steel produced in dense lamellar make Gimli paste state, bolts under axial tensile force, pressure plate between the layers to reduce Jinan electric torsional shear wrench, force completed borne by the bolts. When the external force exceeds the pre-tension bolts between the lamellar to leave each other, called load alienate alienation occurs when the load, tension connection should be less than alienate its external load. (4) mixed with connections and connections: high-strength bolts in joints joint electric torsional shear wrench, but there are several ways to withstand external forces, these connections have high strength bolt friction type connection and pressure-type connector and use; there are high-strength bolting and welding mix; there are high-strength bolts and rivets with other mixed-Fi, a joint force children were borne by the respective types of connection; and use when connecting electric torsional shear wrench, a connector to withstand a force of several connections. High strength bolts with large hexagon head before construction shall be approved by the factory inspection bolts connecting deputy torque coefficient electric torsional shear wrench sale, approved inspection every eight sets, the average of eight sets of torque coefficient should be in the range of 0.110 to 0.150, The standard deviation should be less than or equal to 0.010. Of torque coefficient retest method according to GB50205 "Steel Construction Quality Acceptance" regulations. After the test, high strength bolts shall be installed in a short period of time. Hexagon high strength bolts of construction to determine the torque is calculated as follows: Tc = 1.05k · Pc · d Tc - Construction torque (N · m); k - the average of high strength bolts torque coefficient; Pc - High Construction bolt pre-tension strength (kN), see Table 1; d - high strength bolts screw diameter (mm); Table 1 hexagon high strength bolts construction Pretension Pc (kN) Performance Level bolt bolt nominal diameter M12 M16 M20 (M22 ) M24 M27 M30 8.8S 45 75 120 150 170 225 275 10.9S 60 110 170 210 250 320 390 best quality electric torsional shear wrench | in General Technology (certified) | electric torsional shear wrench from Jinan Cape Technology Co., available. Jinan Cape Technology Co. (www.jnddbs.cn) Shandong Jinan, the other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In general technology leadership with the staff warmly welcome all inquiries to discuss, in general science and technology to create a better future.