Knowledge

The grounding resistance of the grounding device is usually composed of three parts. The first part: the resistance of the grounding body itself, usua

When the train runs in the section of the small radius curve (R=250m), the rail is subjected to various forces, and some elastic supports must be stre

The aggregate sand area of fasteners shall not exceed 100 square mm. No oxide skin is allowed on the surface of the fastener. The remaining technical

1. Simply put, use a hammer drill to drill out the eye that can plug the expansion tube on the wall or fix it, plug the expansion tube into it, and th

The expansion bolt is wrapped with a ring cylinder, which has a gap and is used to make a hole in the wall. Put the expansion bolt into this hole and

The internal expansion nut is a special threaded connector used to fix the pipe support/lift/bracket or equipment on the wall, floor or column. The fi

In fact, when the manufacture of high-strength bolts is very not easy, need to go through a lot of complicated processes can be manufactured, and each

Teflon Teflon product name "Teflon" (Teflon,Flu on), Jane PTEE or F4, commonly known as plastic king, is one of the most corrosion resistant

1, phosphating film does not produce fastener parts surface work hardening layer, increased sulfate content in the solution, impurities in the phospha

If the solar spike can not withstand a certain amount of pressure, it can not work properly after the car is crushed or smashed, therefore, pressure r

Riveting nuts, also known as riveting nuts, pulling caps, instant pulling caps, used in various types of metal sheet, pipe and other manufacturing ind

From beginning to end, the tapping screw is composed of three parts: the head, the rod and the end of the rod. The composition of each self-tapping sc