UNF thread designation

2019-07-24View Original

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1/4\"-28UNF-18: What does 18 mean? Thank you!

Reply #22019-07-25

As a supplement, a depth of 8 mm is specified

Reply #32019-07-25

In the notation for imperial threads, the value 18 represents the tolerance grade; however, it is usually denoted as 2A, 3A, 2B, 3B, etc. If the tolerance grade is not specified, what follows is the code for the inspection system. It is stated that the meaning of the markings is described in the ASME B1.3M standard

Reply #42019-07-27

Thank you. That should be 1B then.

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