According to the use position and function of the bolts of the power distribution line, bolts can be divided into three types: electrical connection, electrical equipment fixing, and iron accessory fixing. Next, 2H Heavy Hex Nuts Factory introduces the classification requirements of bolt use position:  

1. Electrical connection  :  The outdoor primary wiring should be connected by hot-dip galvanized bolts. The bolts used should have flat washers and spring washers. After the bolts are tightened, the bolts should show 2 to 3 buckles. One bolt is equipped with two flat washers, one spring washer, and one nut. When installing, place a flat washer on the head side of the bolt, and place a flat washer and a spring washer on the nut side. The spring washer rests on the nut. 

2. Electrical equipment fixing category:  When connecting the transformer, the distribution box base, and the iron accessories, such as using channel steel inclined bolts, one bolt is equipped with a nut, one inclined washer (for the inclined side of the channel steel) and a flat washer (for a flat surface). Side use). When using channel steel plane bolts to connect and fix, one bolt is equipped with two flat washers, one spring washer, and one nut. When installing, place a flat washer on the head side of the bolt, and place a flat washer and a spring washer on the nut side. The spring washer rests on the nut. In principle, use the mounting bolts provided by the equipment manufacturer to connect the isolation switch, drop-out fuse, arrester, and iron accessories.

3. Iron attachment fixing type:  When the iron attachment connecting bolt hole is a round hole, one bolt is equipped with a nut and two flat washers; when the iron attachment connecting bolt hole is a long hole, one bolt is equipped with a nut and two square washers, When installing, place a flat washer (square washer) on the bolt head side and the nut side. When stud bolts are used for the connection of iron accessories, each end of the bolt is equipped with a nut and a flat washer (square washer). For the bolt connection on the inclined surface of the channel steel and the I-beam flange, use inclined washers as far as possible to make the bearing surface of the nut and bolt head perpendicular to the screw.