Classification of hexagon bolts:
1. According to the force mode of connection, the bolts used for hinged holes should be matched with the size of the holes and used in the case of transverse force;
2, according to the head shape of hexagonal head, round head, square head, countersunk head, and so on the general countersunk head used in the requirement after the connection surface is smooth without protuberant place, because countersunk head can be screwed into the parts.Square head tightening force can be larger, but the size is large, hexagon head is the most commonly used.
The bolt length of class A and class B is different
The A bolt is longer than the B bolt.
2. Manufacturing accuracy is different
The manufacturing accuracy of grade A is higher than that of grade B.
Class A and class B are refined bolts, with smooth surface, accurate size, high requirements for hole quality, complex production and installation, and high price, which are rarely used in steel structure.
https://www.better-wear.com/hex-excavator-bolt-and-nuts-1a2029-1a8063-2a1538-for-wear-part.html
Post time: Sep-04-2019