What are the standards of screw bolts?

Oct 14,2022

The most commonly used standards of screw bolts in ordinary business are the following:

GB---Chinese National Standard

ANSI---American National Standard

DIN---German National Standard

ASME---American Society of Mechanical Engineers Standard

JIS---Japanese National Standard

BSW---British National Standard

There are the differences in the basic dimensions of the above several standards, such as the opposite sides of the head, the thickness of the head and the threaded part. The threads of GB, DIN, and JIS are all based on millimeters as metric threads. Threads such as ANSI and ASME are American standard threads in inches. There is also a BSW-imperial standard which threads are also measured in inches, commonly known as Wyeth threads.

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