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1796 METRIC SCREW THREADS M PROFILE Table 10. (Continued) ANSI Standard Pitch-Diameter Tolerances of Internal Metric Threads, T D2 ISO 965/1 ANSI/ASME B1.13M-1983 (R1995) Basic Major Diameter, D Machinery's Handbook 27th Edition Tolerance Grade Up to Pitch Over and incl. P 4 5 6 7 8 90 180 2 0.160 0.200 0.250 0.315 0.400 3 0.190 0.236 0.300 0.375 0.475 4 0.212 0.265 0.335 0.425 0.530 6 0.250 0.315 0.400 0.500 0.630 180 355 3 0.212 0.265 0.335 0.425 0.530 4 0.236 0.300 0.375 0.475 0.600 6 0.265 0.335 0.425 0.530 0.670 All dimensions are in millimeters. Table 11. ANSI Standard Pitch-Diameter Tolerances of External Metric Threads, T d2 ISO 965/1 ANSI/ASME B1.13M-1983 (R1995) Basic Major Diameter, d Pitch Tolerance Grade Over Up to and incl. P 3 4 5 6 7 8 9 1.5 2.8 0.2 0.025 0.032 0.040 0.050 … … … 0.25 0.028 0.036 0.045 0.056 … … … 0.35 0.032 0.040 0.050 0.063 0.080 … … 0.4 0.034 0.042 0.053 0.067 0.085 … … 0.45 0.036 0.045 0.056 0.071 0.090 … … 2.8 5.6 0.35 0.034 0.042 0.053 0.067 0.085 … … 0.5 0.038 0.048 0.060 0.075 0.095 … … 0.6 0.042 0.053 0.067 0.085 0.106 … … 0.7 0.045 0.056 0.071 0.090 0.112 … … 0.75 0.045 0.056 0.071 0.090 0.112 … … 0.8 0.048 0.060 0.075 0.095 0.118 0.150 0.190 5.6 11.2 0.75 0.050 0.063 0.080 0.100 0.125 … … 1 0.056 0.071 0.090 0.112 0.140 0.180 0.224 1.25 0.060 0.075 0.095 0.118 0.150 0.190 0.236 1.5 0.067 0.085 0.106 0.132 0.170 0.212 0.265 11.2 22.4 1 0.060 0.075 0.095 0.118 0.150 0.190 0.236 1.25 0.067 0.085 0.106 0.132 0.170 0.212 0.265 1.5 0.071 0.090 0.112 0.140 0.180 0.224 0.280 1.75 0.075 0.095 0.118 0.150 0.190 0.236 0.300 2 0.080 0.100 0.125 0.160 0.200 0.250 0.315 2.5 0.085 0.106 0.132 0.170 0.212 0.265 0.335 22.4 45 1 0.063 0.080 0.100 0.125 0.160 0.200 0.250 1.5 0.075 0.095 0.118 0.150 0.190 0.236 0.300 2 0.085 0.106 0.132 0.170 0.212 0.265 0.335 3 0.100 0.125 0.160 0.200 0.250 0.315 0.400 3.5 0.106 0.132 0.170 0.212 0.265 0.335 0.425 4 0.112 0.140 0.180 0.224 0.280 0.355 0.450 4.5 0.118 0.150 0.190 0.236 0.300 0.375 0.475 45 90 1.5 0.080 0.100 0.125 0.160 0.200 0.250 0.315 2 0.090 0.112 0.140 0.180 0.224 0.280 0.355 3 0.106 0.132 0.170 0.212 0.265 0.335 0.425 4 0.118 0.150 0.190 0.236 0.300 0.375 0.475 5 0.125 0.160 0.200 0.250 0.315 0.400 0.500 5.5 0.132 0.170 0.212 0.265 0.335 0.425 0.530 6 0.140 0.180 0.224 0.280 0.355 0.450 0.560 90 180 2 0.095 0.118 0.150 0.190 0.236 0.300 0.375 3 0.112 0.140 0.180 0.224 0.280 0.355 0.450 4 0.125 0.160 0.200 0.250 0.315 0.400 0.500 6 0.150 0.190 0.236 0.300 0.375 0.475 0.600 180 355 3 0.125 0.160 0.200 0.250 0.315 0.400 0.500 4 0.140 0.180 0.224 0.280 0.355 0.450 0.560 6 0.160 0.200 0.250 0.315 0.400 0.500 0.630 All dimensions are in millimeters. Copyright 2004, Industrial Press, Inc., New York, NY
Machinery's Handbook 27th Edition METRIC SCREW THREADS M PROFILE 1797 Tolerance Grade Comparisons.—The approximate ratios of the tolerance grades shown in Tables 8, 9, 10, and 11 in terms of Grade 6 are as follows: Minor Diameter Tolerance of Internal Thread: T D1 (Table 8): Grade 4 is 0.63 T D1 (6); Grade 5 is 0.8 T D1 (6); Grade 7 is 1.25 T D1 (6); and Grade 8 is 1.6 T D1 (6). Pitch Diameter Tolerance of Internal Thread: T D2 (Table 10): Grade 4 is 0.85 T d2 (6); Grade 5 is 1.06 T d2 (6); Grade 6 is 1.32 T d2 (6); Grade 7 is 1.7 T d2 (6); and Grade 8 is 2.12 T d2 (6). It should be noted that these ratios are in terms of the Grade 6 pitch diameter tolerance for the external thread. Major Diameter Tolerance of External Thread: T d (Table 9): Grade 4 is 0.63 T d (6); and Grade 8 is 1.6 T d (6). Pitch Diameter Tolerance of External Thread: T d2 (Table 11): Grade 3 is 0.5 T d2 (6); Grade 4 is 0.63 T d2 (6); Grade 5 is 0.8 T d2 (6); Grade 7 is 1.25 T d2 (6); Grade 8 is 1.6 T d2 (6); and Grade 9 is 2 T d2 (6). Standard M Profile Screw Threads, Limits of Size.—The limiting M profile for internal threads is shown in Fig. 6 with associated dimensions for standard sizes in Table 12. The limiting M profiles for external threads are shown in Fig. 7 with associated dimensions for standard sizes in Table 13. If the required values are not listed in these tables, they may be calculated using the data in Tables 3, 6, 7, 8, 9, 10, and 11 together with the preceding formulas. If the required data are not included in any of the tables listed above, reference should be made to Sections 6 and 9.3 of ANSI/ASME B1.13M, which gives design formulas. Fig. 6. Internal Thread — Limiting M Profile. Tolerance Position H *This dimension is used in the design of tools, etc. For internal threads it is not normally specified. Generally, major diameter acceptance is based on maximum material condition gaging. Copyright 2004, Industrial Press, Inc., New York, NY
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