How to purchase no 4 self tapping screw?

no 4 self tapping screw is indicated by inch threads. Many times in China we use metric threads and sometimes we use inch threads. The Shi Shi Tong screw factory also trades abroad and has cooperation with 43 countries. There will be many customers asking for no 4 self tapping screw.

no 4 self tapping screw is generally used for construction machinery parts, the ends of which are sharp as nails, and the threaded parts of small cylindrical or conical metal rods are assembled.

The customer is paying attention to the quality of the screw when purchasing the screw. How to test the no 4 self tapping screw?

The detection of the screw should start from the wire of the screw. The quality of the precision screw is directly related to the wire that produces the screw.

Secondly, in the detection of the head forming of the screw, in the forming of the screw, the mold of the production screw is first detected. Have a good mold to make a good screw product.

Then there is the detection of the screwing of the screw. Of course, the screw is the first to be the tooth plate. Good teeth should be able to pass the stop gauge. It is also important to detect the thread pitch of the teeth. It must also meet the national standards for screws or customer requirements.

Finally, the color of the plated screws and the salt spray test are tested. Look at the color of the screws that are plated back. How smooth is the surface of the screw?

If you want to learn no 4 self tapping screw, please feel free to contact us at annie.li@szsst88.com

Skype: kalyn qin M: +86 18124507113 Tel: +86 0755-85296744 Email: annie.li@szsst88.com Add: No. 11, Dinghou Road, Dongfang Community, Songgang Street, Baoan District, Shenzhen, Guangdong, China