M4 Washer Head Screw

Overall Description

Anti-corrosion measures for stainless steel screws

     1. Use qualified stainless steel screws to avoid the formation of gaps in the structural design and avoid the geometric conditions that cause surface deposition easily;

     2. The stainless steel screw and Cl-containing solution for effective isolation, can not avoid the gap, so it should be welded or fill the gap, so that the aqueous solution can not enter;

     3. The use of stainless steel with high chromium and high molybdenum, especially in the low temperature tank area, the spherical tank area, and the stress corrosion serious area, the steel with good corrosion resistance is better.

M4 Washer Head Screw Details

The mechanical properties are different, so to remove the screws is also different. Nowadays, the requirements for mechanical properties are getting higher and higher, and the requirements for screw hardness are getting higher and higher. Generally, the grade of screws is 4.6, 4.8, 5.6, 5.8, 8.8, 10.9, and 12.9. 

M4 Washer Head Screw Application

M4 Washer Head Screw Production Flow 

Partners

The common problems occuring to the screws:

1. The head of the screw is deformed. It is very likely that this problem is caused by a position in the screw mold during the production process that is not placed or improperly adjusted.

2. The head of the screw is not round. This problem is also common in the process of the production.

3. The screw has some burrs. This is mainly because the mould is not formed well, and when the punch is short, it will cause such a problem.

4. There is a crack in the head of the screw. This may be caused by the unqualified material.

Therefore, before the screw is produced, we must strictly test the material. When we find that the material is not qualified, it must not be produced. For example, when we are testing, there will be the data of the testing so that we can know whether the wire is qualified or not.