There are differences in tooth shape, number of teeth, and applicable situations between coarse thread (unc), fine thread (unf), ultra-fine thread (unef), and special pitch thread (uns): 1. Tooth shape unc represents the U.S. unified thread UN series (external thread root radius is optional). Unc is an American coarse thread, profile 60° unf is an American fine thread, profile 60° npt is an American tapered pipe thread, profile 60° nps is an American parallel pipe thread, profile 60° inch-made unified thread, widely used in inch-based countries, this type of thread is divided into three types. Un, unf, unc; are the identification of inch-based unified threads. Un is the abbreviation of unified national, which belongs to the constant pitch series of unified threads. unf is the abbreviation of unified national fine in English, which is a unified thread fine tooth series. unc is English unified.
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