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 Type: Semi-tooth external hexagon bolt GB5782, ISO4014 


 Standard: GB1228/1229/1230 DIN6914/6915/6916 


 Size: M4 - M100 








 Main products 


 Hex, hex, high strength steel with a hexagon head bolts, hex head bolt holes twisted, twisted steel shear type high strength bolts, nuts and T-type, double-headed, square head, countersunk head, tight set , flange, stainless steel and other standards and specifications for various models of non-standard bolts, sizes from M4-M100, length. 


 Product levels are: 4.8, 6.8, 8.8, 10.9, 12.9, B7, L7, B7M. 







 Bolts: the head and the screw (with external thread cylinder) a class of two-part fasteners, to be with and nut for fastening with a hole connecting the two parts. This form of said bolted connections. If the nuts from the bolts on the rotation, but also enables the two parts separately, so the bolts are removable connection. Since the bolt is also a railway parts, railway parts is an integral part of the railway line, referred to here tracks including rails, sleepers, link components, ballast, anti-climb devices, such as rail support and turnout. As an overall project structure, the track laid in the embankment above the train plays a guiding role, directly bear the load of rolling stock and its pressure. In the power train operation under the action of its various components must have sufficient strength and stability, to ensure the maximum train speed in accordance with, safe, stable and uninterrupted operation. 

 General classification and special bolts 

 Connection of the force by way of sub: sub-normal and articulation hole used. Articulation with the bolt hole and the hole size to match, used by the lateral force. By head shape: a hexagonal head, round, square head, countersunk head and so on. Hex head which is the most common. Normal countersunk head with a smooth surface in connection requires no protruding parts, because the screw head can sink to the part where. Round parts can be screwed into the inside. Square head of the tightening force can be a little bigger, but size is large. Another lock after installation in order to meet the needs of a head hole, shank hole, these holes can not bolt to come loose by vibration. Some bolts threaded rod not be conducted carefully, called slender bolts. This bolt is conducive to change by the force of the link. There are special steel bolt, the head will be bigger and more, sizes have changed. Another special use of: T-slot bolts, clamps on the machine with the most special shape, side of the head to be cut off. Anchor bolts, and ground connections for the machine fixed, there are a variety of shapes. U-bolts, as described above. And so on. There is a special stud welding, a threaded one did not, you can weld the parts on the other side of the direct screw nut