Half space center bolt is a kind of mechanical parts that need to be selected when tightening two or more parts into a whole. It is characterized by a variety of types, specifications and models, the main features of different uses, and the level of standardization, generalization and practicality is very high. The common raw materials for manufacturing half space center bolt are alloy steel, high alloy steel and rare metal. However, in special occasions, the raw materials of the half space center bolt of waterproof lantern rivet must consider the standard of serious erosion or high toughness. There are many stainless steel plates and stainless steel plates with extremely high compressive strength.

1、 Specification of characteristics of raw materials for half space center bolt

(1) The regulations on the physical properties, especially the compressive strength, of the raw materials of the half space center bolt are specified;

(2) The working condition standard specifies the corrosion resistance of raw materials;

(3) The requirements of manufacturing temperature on the temperature resistance of raw materials;

(4) The requirements of processing technology level on the characteristics of raw materials;

(5) Other requirements such as net weight, price, delivery and purchase must be taken into account.