This Standard specifies the thread form, series, class,allowance, tolerance, and designation for unified screw threads. (In order to emphasize that unified screw threads are based on inch modules, they may be denoted unified inch screw threads.) Several variations in thread form have been developed for unified threads; however, this Standard covers only UN, UNR,and UNJ thread forms.
The metric translation ofthis Standard that was in the 2003 edition has been removed (see Nonmandatory Appendix C). Nonmandatory Appendices D through Fcontain information thatis supplementary to the sections of this Standard.
