Unified Inch Screw Threads
|Publication Date:||1 January 1974|
This standard, ANSI B 1.1, specifies the thread form, series, classes, allowance, tolerance and designations 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 and UNR thread forms.
For easy reference, USA Standard USAS Bl.la- 1968 "Unified Screw Threads-Metric Translation" has been incorporated as Section 10. The Appendices which follow Section 1 0 contain useful information that is supplementary to the Sections.