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ANSI/ASME B1.9-1973 (R2001)

Buttress Inch Screw Threads

Relates to screw threads of buttress form and provides: (a) A form of 7 deg /45 deg buttress thread with 0.6p basic height of thread engagement (b) A table of preferred diameter-pitch combinations (c) A formula for calculating pitch diameter tolerances (d) Tolerances for major and minor diameters (e) A system of allowances between external and internal threads (f) Recommended methods of measuring and gaging (g) Dimensional acceptability of buttress product

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