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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, a metric translation of this Standard has been incorporated as Nonmandatory Appendix C.
Nonmandatory Appendices A through E contain useful information that is supplementary to the sections of this Standard. Browse Publishers. Top Sellers.
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UNS Thread ASME B1.1-2003
The revisions pose the risk of controversy over thread requirements and disputes over part acceptability. It is suggested that you obtain a copy of the revised standard and begin implementation of the new standard immediately. These threads may also be known as unified inch screw threads. Several variations in screw thread form have been developed as modifications of the unified screw thread form defined in this standard, but their definitions will be found in alternate standards. The difference between UNR-series and UN-series screw threads is that the root of the UNR-series screw threads has a radius, where the root of the UN-series screw threads may have either a radius or a flat. They have substantially the same screw thread form, and screw threads of any of the three designations having the same nominal major diameter and pitch threads-per-inch which makes them mechanically interchangeable. The principal differences between these three screw thread series relate to the application of allowances, the variation of tolerance within size, differences in the amounts of pitch diameter tolerances, and differences in the base designations.