本标准确立了UNJ螺纹形状的基本三角形轮廓，提供了一个命名系统，列出了直径为0.600至6.000 in.的标准系列直径-节距组合。，以及限制尺寸和公差的细节。它规定了UNJ英制系列螺纹的特性，外螺纹根部的设计半径为0.15011Pto 0.18042P，外螺纹和内螺纹的小直径增加到ASME B1以上。1 UN和UNR螺纹形状，以适应外螺纹最大根部半径。这个版本包括勘误表。

This Standard establishes the basic triangular profile for the UNJ thread form, provides a system of designations, lists the standard series of diameter-pitch combinations for diameters from 0.600 to 6.000 in., and specifics limiting dimensions and tolerances.It specifies the characteristics of the UNJ inch series of threads having 0.15011Pto 0.18042Pdesigned radius at the root of the external thread, and also having the minor diameter of the external and internal threads increased above the ASME B1.1 UN and UNR thread forms to accommodate the external thread maximum root radius.This edition includes errata.