Metric Screw Threads M Profile Machinery's Handbook, 31st Edition
2023
Internal Threads: Min major dia. = basic major dia. + EI (Table 6) Min pitch dia. = basic major dia. − 0.6495191 P (Table 3) + EI for D 2 (Table 6) Max pitch dia. = min pitch dia. + TD 2 (Table 10) Max major dia. = max pitch dia. + 0.7938566 P (Table 3) Min minor dia. = min major dia. − 1.0825318 P (Table 3) Max minor dia. = min minor dia. + TD 1 (Table 8) External Threads: Max major dia. = basic major dia. − es (Table 6) (Note that es is an absolute value.) Min major dia. = max major dia. − Td (Table 9) Max pitch dia. = basic major dia. − 0.6495191 P (Table 3) − es for d 2 (Table 6) Min pitch dia. = max pitch dia. − Td 2 (Table 11) Max flat form minor dia. = max pitch dia. − 0.433013 P (Table 3) Max rounded root minor dia. = max pitch dia. − 2 × max trunc. (See Fig. 4) Min rounded root minor dia. = min pitch dia. − 0.616025 P (Table 3) Min root radius = 0.125 P Table 8. ANSI Standard Minor Diameter Tolerances of Internal Metric Threads TD 1 ISO 965/1 ANSI/ASME B1.13M-2005 (R2015) Pitch P Tolerance Grade 4 5 6 a 7 8 0.2 0.038 … … … … 0.25 0.045 0.056 … … … 0.3 0.053 0.067 0.085 … … 0.35 0.063 0.080 0.100 … … 0.4 0.071 0.090 0.112 … … 0.45 0.080 0.100 0.125 … … 0.5 0.090 0.112 0.140 0.180 … 0.6 0.100 0.125 0.160 0.200 … 0.7 0.112 0.140 0.180 0.224 … 0.75 0.118 0.150 0.190 0.236 … 0.8 0.125 0.160 0.200 0.250 0.315 1 0.150 0.190 0.236 0.300 0.375 1.25 0.170 0.212 0.265 0.335 0.425 1.5 0.190 0.236 0.300 0.375 0.475 1.75 0.212 0.265 0.335 0.425 0.530 2 0.236 0.300 0.375 0.475 0.600 2.5 0.280 0.355 0.450 0.560 0.710 3 0.315 0.400 0.500 0.630 0.800 3.5 0.355 0.450 0.560 0.710 0.900 4 0.375 0.475 0.600 0.750 0.950 4.5 0.425 0.530 0.670 0.850 1.060 5 0.450 0.560 0.710 0.900 1.120 5.5 0.475 0.600 0.750 0.950 1.180 6 0.500 0.630 0.800 1.000 1.250 8 0.630 0.800 1.000 1.250 1.600 a Tabulated in this standard for M internal threads. All dimensions are in millimeters.
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