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Pitch P Table 3. American National Standard Metric Thread — M Profile Data ANSI/ASME B1.13M-1983 (R1995) Truncation of Internal Thread Root and External Thread Crest H --- 8 0.108253P All dimensions are in millimeters. Addendum of Internal Thread and Truncation of Internal Thread H --- 4 0.216506P Dedendum of Internal Thread and Addendum External Thread 3 --H 8 0.324760P Machinery's Handbook 27th Edition Differencea H --- 2 0.433013P Height of InternalThread and Depth of Thread Engagement 5 --H 8 0.541266P Difference b 0.711325H 0.616025P Twice the External Thread Addendum 3 --H 4 0.649519P Differencec 11 -----H 12 0.793857P Height of Sharp V-Thread H 0.8660254P Double Height of Internal Thread 5 --H 4 1.082532P 0.2 0.02165 0.04330 0.06495 0.08660 0.10825 0.12321 0.12990 0.15877 0.17321 0.21651 0.25 0.02706 0.05413 0.08119 0.10825 0.13532 0.15401 0.16238 0.19846 0.21651 0.27063 0.3 0.03248 0.06495 0.09743 0.12990 0.16238 0.18481 0.19486 0.23816 0.25981 0.32476 0.35 0.03789 0.07578 0.11367 0.15155 0.18944 0.21561 0.22733 0.27785 0.30311 0.37889 0.4 0.04330 0.08660 0.12990 0.17321 0.21651 0.24541 0.25981 0.31754 0.34641 0.43301 0.45 0.04871 0.09743 0.14614 0.19486 0.24357 0.27721 0.29228 0.35724 0.38971 0.48714 0.5 0.05413 0.10825 0.16238 0.21651 0.27063 0.30801 0.32476 0.39693 0.43301 0.64952 0.6 0.06495 0.12990 0.19486 0.25981 0.32476 0.36962 0.38971 0.47631 0.51962 0.64952 0.7 0.07578 0.15155 0.22733 0.30311 0.37889 0.43122 0.45466 0.55570 0.60622 0.75777 0.75 0.08119 0.16238 0.24357 0.32476 0.40595 0.46202 0.48714 0.59539 0.64952 0.81190 0.8 0.08660 0.17321 0.25981 0.34641 0.43301 0.49282 0.51962 0.63509 0.69282 0.86603 1 0.10825 0.21651 0.32476 0.43301 0.54127 0.61603 0.64952 0.79386 0.86603 1.08253 1.25 0.13532 0.27063 0.40595 0.54127 0.67658 0.77003 0.81190 0.99232 1.08253 1.35316 1.5 0.16238 0.32476 0.48714 0.64952 0.81190 0.92404 0.97428 1.19078 1.29904 1.62380 1.75 0.18944 0.37889 0.56833 0.75777 0.94722 1.07804 1.13666 1.38925 1.51554 1.89443 2 0.21651 0.43301 0.64952 0.86603 1.08253 1.23205 1.29904 1.58771 1.73205 2.16506 2.5 0.27063 0.54127 0.81190 1.08253 1.35316 1.54006 1.62380 1.98464 2.16506 2.70633 3 0.32476 0.64652 0.97428 1.29904 1.62380 1.84808 1.94856 2.38157 2.59808 3.24760 3.5 0.37889 0.75777 1.13666 1.51554 1.89443 2.15609 2.27332 2.77850 3.03109 3.78886 4 0.43301 0.86603 1.29904 1.73205 2.16506 2.46410 2.59808 3.17543 3.46410 4.33013 4.5 0.48714 0.97428 1.46142 1.94856 2.43570 2.77211 2.92284 3.57235 3.89711 4.87139 5 0.54127 1.08253 1.62380 2.16506 2.70633 3.08013 3.24760 3.96928 4.33013 5.41266 5.5 0.59539 1.19078 1.78618 2.38157 2.97696 3.38814 3.57235 4.36621 4.76314 5.95392 6 0.64952 1.29904 1.94856 2.59808 3.24760 3.69615 3.89711 4.76314 5.19615 6.49519 8 0.86603 1.73205 2.59808 3.46410 4.33013 4.92820 5.19615 6.35085 6.92820 8.66025 a Difference between max theoretical pitch diameter and max minor diameter of external thread and between min theoretical pitch diameter and min minor diameter of internal thread. b Difference between min theoretical pitch diameter and min design minor diameter of external thread for 0.125P root radius. c Difference between max major diameter and max theoretical pitch diameter of internal thread. Copyright 2004, Industrial Press, Inc., New York, NY 1786 METRIC SCREW THREADS M PROFILE
METRIC SCREW THREADS M PROFILE 1787 Table 4. American National Standard General Purpose and Mechanical Fastener Coarse Pitch Metric Thread—M Profile Series ANSI/ASME B1.13M-1983 (R1995) Nom. Size Pitch Nom. Size Pitch Nom. Size Pitch Nom. Size Pitch 1.6 0.35 6 1 22 2.5a 56 5.5 2 0.4 8 1.25 24 3 64 6 2.5 0.45 10 1.5 27 3a 72 6 3 0.5 12 1.75 30 3.5 80 6 3.5 0.6 14 2 36 4 90 6 4 0.7 16 2 42 4.5 100 6 5 0.8 20 2.5 48 5 … … a For high strength structural steel fasteners only. All dimensions are in millimeters. Table 5. American National Standard Fine Pitch Metric Thread—M Profile Series ANSI/ASME B1.13M-1983 (R1995) Nom. Size Pitch a Only for wheel studs and nuts. All dimensions are in millimeters. Nom. Size Pitch Nom. Size Pitch Nom. Size Pitch 8 1 … 27 … 2 56 … 2 105 2 10 0.75 1.25 30 1.5 2 60 1.5 … 110 2 12 1 1.5 a Machinery's Handbook 27th Edition 1.25 33 … 2 64 … 2 120 2 14 … 1.5 35 1.5 … 65 1.5 … 130 2 15 1 … 36 … 2 70 1.5 … 140 2 16 … 1.5 39 … 2 72 … 2 150 2 17 1 … 40 1.5 … 75 1.5 … 160 3 18 … 1.5 42 … 2 80 1.5 2 170 3 20 1 1.5 45 1.5 … 85 … 2 180 3 22 … 1.5 48 … 2 90 … 2 190 3 24 … 2 50 1.5 … 95 … 2 200 3 25 1.5 … 55 1.5 … 100 … 2 Limits and Fits for Metric Screw Threads — M Profile.—The International (ISO) metric tolerance system is based on a system of limits and fits. The limits of the tolerances on the mating parts together with their allowances (fundamental deviations) determine the fit of the assembly. For simplicity the system is described for cylindrical parts (see British Standard for Metric ISO Limits and Fits starting on page 679) but in this Standard it is applied to screw threads. Holes are equivalent to internal threads and shafts to external threads. Basic Size: This is the zero line or surface at assembly where the interface of the two mating parts have a common reference. * Upper Deviation: This is the algebraic difference between the maximum limit of size and the basic size. It is designated by the French term “écart supérieur” (ES for internal and es for external threads). Lower Deviation: This is the algebraic difference between the minimum limit of size and the basic size. It is designated by the French term “écart inférieur” (EI for internal and ei for external threads). * Basic,” when used to identify a particular dimension in this Standard, such as basic major diameter, refers to the h/H tolerance position (zero fundamental deviation) value. Copyright 2004, Industrial Press, Inc., New York, NY
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