In most cases, the series will be UNC, UNF, or UNEF (Coarse, Fine, or Extra fine pitch). ASTM B1.1, also defines several constant pitch series. These are denoted by ##-UN. For example, 12-UN or 8-UN. The pitch remains the same for the whole diameter range in these series. However, they are much less popular. Class:

However, a longer engagement is required for fine thread applications than for coarse series threads to prevent stripping. 8 – Thread Series (8UN) is the specified thread forming method for several ASTM standards including A193 B7, A193 B8/B8M, and A320.

2015年7月2日 · Nominal Size and Threads Per In. In.

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Fine thread fasteners have higher tension strength due to the larger tensile stress areas. However, fine thread applications require a longer engagement than coarse thread applications to ensure stripping does not occur. The specified thread forming method for several ASTM standards is 8 – Thread Series (8UN). This includes A193 B7, A193 B8 ...

The words “coarse” and “fine” are given in order to conform to usage. No concept of quality however, is associated with these words. “Coarse” pitches are the largest metric pitches used. For the diameter selected, choose one of the pitches shown on the corresponding line.

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