Definition of Terms:
The definitions presented herein are listed alphabetically and apply generally to all forms of screw threads, thread gages, and thread measurements. They relate to the following:
A types of screw threads
B size and fit of threaded parts in general
C geometric elements, attributes, and dimensions of screw threads
ISO nomenclature is used where the exact meaning is coincident with the U.S. practice.
THE SCOPE OF ASME B1.7:
The purpose of ASME B1.7 is to establish a uniform practice for
standard screw threads with regard to the following: (a) Screw thread
nomenclature; (b) Letter symbols for the designating features of
a screw thread for use on drawings, in tables that set forth dimensional
standards, in other records, and for expressing mathematical relationships.
ASME B1.7 is a glossary of terms, illustrations, and illustrated
table showing the application of symbols, and a table of screw thread
series designation. Many of the terms and symbols specified in ASME
B1.7:2006 vary considerably from those previously specified in ASME
B1.7:1984 because ISO terms and symbols have been adopted where
the intended definition is the same.
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Original Posting: 3/2/2012
Last Revision: 8/13/2012
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