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ASME B1.9 Document Information:
Title
Buttress Inch Screw Threads 7 Degrees/45 Degrees Form with 0.6 Pitch Basic Height of Thread Engagement
ASME International
Publication Date:
Jan 1, 1973
Scope:
This standard relates to screw threads of buttress form and provides:
(a) A form of 7°/45° buttress thread with 0.6p basic height of
thread engagement (see Fig.
1a).
(b) A table of preferred diameter-pitch combinations (see Table 1).
(c) A formula for calculating pitch diameter tolerances (see Par.
6.1).
(d) Tolerances for major and minor diameters (see Par. 6.2 and 6.3).
(e) A system of allowances between external and internal threads (see
Par. 7).
(f) Recommended methods of measuring and gaging (see Par. 10 and 11).
(g) Dimensional acceptability of buttress product (see Section 12).
APPENDIXES
The following appendixes are included in this standard:
(1) Pitch Diameter Equivalents for Lead and Flank Angle Deviations
(2) Pitch Diameter-Measurement for External and Internal Buttress
Threads
(3) 7°/45° British Standard Buttress Thread with 0.4p Basic
Height of Thread Engagement.
The intent of this standard is not to preclude the use of other
measuring or gaging systems
provided they are properly correlated.
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