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1818 BRITISH STANDARD ISO METRIC SCREW THREADS position, capital for nuts, lower case for bolts. If the two class designations for a thread are the same (one for the pitch diameter and one for the crest diameter), it is not necessary to repeat the symbols. As examples, a bolt thread designated M10-6g signifies a thread of 10 mm nominal diameter in the Coarse Thread Series having a tolerance class 6g for both pitch and major diameters. A designation M10 × 1-5g6g signifies a bolt thread of 10 mm nominal diameter having a pitch of 1 mm, a tolerance class 5g for pitch diameter, and a tolerance class 6g for major diameter. A designation M10-6H signifies a nut thread of 10 mm diameter in the Coarse Thread Series having a tolerance class 6H for both pitch and minor diameters. 30° 30° ;;;;;; ;;;;;; ;;;;;; Nut (Internal Thread) H H/4 H/4 90° Bolt (External Thread) 5/8 H H H/4 P/8 P/2 Axis of nut P H/8 P/4 5/8 H 3/8 H 30° ;;;;;; ;;;;;; ;;;;;; 90° Machinery's Handbook 27th Edition H/8 P Axis of bolt P/2 In practice the root is rounded and cleared beyond a width of P/8 Pitch line In practice the root is rounded and cleared beyond a width of P/8 Pitch line Fig. 3. Maximum Material Profiles for Internal and External Threads A fit between mating parts is indicated by the nut thread tolerance class followed by the bolt thread tolerance class separated by an oblique stroke. Examples: M6-6H/6g and M20 × 2-6H/5g6g. For coated threads, the tolerances apply to the parts before coating, unless otherwise specified. After coating, the actual thread profile shall not at any point exceed the maximum material limits for either tolerance position H or h. Fundamental Deviation Formulas.—The formulas used to calculate the fundamental deviations in Table 2 are: EI G = + (15 + 11P) EI H =0 es e =−(50 + 11P) except for threads with P ≤ 0.45 mm es f =−(30 + 11P) es g =−(15 + 11P) es h =0 In these formulas, EI and es are expressed in micrometers and P is in millimeters. P P/8 P/8 Copyright 2004, Industrial Press, Inc., New York, NY
BRITISH STANDARD ISO METRIC SCREW THREADS 1819 Crest Diameter Tolerance Formulas.—The tolerances for the major diameter of bolt threads (T d), grade 6, in Table 5, were calculated from the formula: In this formula, T d (6) is in micrometers and P is in millimeters. For tolerance grades 4 and 8: T d (4) = 0.63 T d (6) and T d (8) = 1.6 T d (6), respectively. The tolerances for the minor diameter of nut threads (T D1 ), grade 6, in Table 5, were calculated as follows: For pitches 0.2 to 0.8 mm, T D1 (6) = 433P − 190P 1.22 . For pitches 1 mm and coarser, T D1 (6) = 230P 0.7 . In these formulas, T D1 (6) is in micrometers and P is in millimeters. For tolerance grades 4, 5, 7, and 8: T D1 (4) = 0.63 T D1 (6); T D1 (5) = 0.8 T D1 (6); T D1 (7) = 1.25 T D1 (6); and T D1 (8) = 1.6 T D1 (6), respectively. Nominal Diametera 1 1.1 1.2 1.4 1.6 1.8 2 2.2 Coarse 0.25 0.25 0.25 0.3 0.35 0.35 0.4 0.45 Table 5. British Standard ISO Metric Screw Threads: Limits and Tolerances for Finished Uncoated Threads for Normal Lengths of Engagement BS 3643: Part 2: 1981 Pitch External Threads (Bolts) Internal Threads (Nuts) b Fine Tol. Class Machinery's Handbook 27th Edition Td( 6) 180 P2 3 3.15 = – --------- P Major Dia. Pitch Dia. Minor Dia Fund dev. Max Tol(−) Max Tol(−) Min Min Max Tol(−) Max Tol(−) 0.2 4h 6g 0 0.017 1.000 0.983 0.036 0.056 0.870 0.853 0.030 0.048 0.717 0.682 4H 1.000 0.910 0.040 0.821 0.038 4h 0 1.000 0.042 0.838 0.034 0.649 4H 1.000 0.883 0.045 0.774 0.045 6g 0.018 0.982 0.067 0.820 0.053 0.613 5H 1.000 0.894 0.056 0.785 0.056 0.2 4h 6g 0 0.017 1.100 1.083 0.036 0.056 0.970 0.953 0.030 0.048 0.817 0.782 4H 1.100 1.010 0.040 0.921 0.038 4h 0 1.100 0.042 0.938 0.034 0.750 4H 1.100 0.983 0.045 0.874 0.045 6g 0.018 1.082 0.067 0.920 0.053 0.713 5H 1.100 0.994 0.056 0.885 0.056 0.2 4h 6g 0 0.017 1.200 1.183 0.036 0.056 1.070 1.053 0.030 0.048 0.917 0.882 4H 1.200 1.110 0.040 1.021 0.038 4h 0 1.200 0.042 1.038 0.034 0.850 4H 1.200 1.083 0.045 0.974 0.045 6g 0.018 1.182 0.067 1.020 0.053 0.813 5H 1.200 1.094 0.056 0.985 0.056 0.2 4h 6g 0 0.017 1.400 1.383 0.036 0.056 1.270 1.253 0.030 0.048 1.117 1.082 4H 1.400 1.310 0.040 1.221 0.038 4h 0 1.400 0.048 1.205 0.036 0.984 4H 1.400 1.253 0.048 1.128 0.053 6g 0.018 1.382 0.075 1.187 0.056 0.946 5H 1.400 1.265 0.060 1.142 0.067 6H 1.400 1.280 0.075 1.160 0.085 0.2 4h 6g 0 0.017 1.600 1.583 0.036 0.056 1.470 1.453 0.032 0.050 1.315 1.280 4H 1.600 1.512 0.042 1.421 0.038 4h 0 1.600 0.053 1.373 0.040 1.117 4H 1.600 1.426 0.053 1.284 0.063 6g 0.019 1.581 0.085 1.354 0.063 1.075 5H 1.600 1.440 0.067 1.301 0.080 6H 1.600 1.458 0.085 1.321 0.100 0.2 4h 6g 0 0.017 1.800 1.783 0.036 0.056 1.670 1.653 0.032 0.050 1.515 1.480 4H 1.800 1.712 0.042 1.621 0.038 4h 0 1.800 0.053 1.573 0.040 1.317 4H 1.800 1.626 0.053 1.484 0.063 6g 0.019 1.781 0.085 1.554 0.063 1.275 5H 1.800 1.640 0.067 1.501 0.080 6H 1.800 1.658 0.085 1.521 0.100 4h 0.25 6g 0 0.018 2.000 1.982 0.042 0.067 1.838 1.820 0.036 0.056 1.648 1.610 4H 5H 2.000 2.000 1.886 1.898 0.048 0.060 1.774 1.785 0.045 0.056 4h 0 2.000 0.060 1.740 0.042 1.452 4H 2.000 1.796 0.056 1.638 0.071 6g 0.019 1.981 0.095 1.721 0.067 1.408 5H 2.000 1.811 0.071 1.657 0.090 6H 2.000 1.830 0.090 1.679 0.112 4h 0.25 6g 0 0.018 2.200 2.182 0.042 0.067 2.038 2.020 0.036 0.056 1.848 1.810 4H 5H 2.200 2.200 2.086 2.098 0.048 0.060 1.974 1.985 0.045 0.056 4h 0 2.200 0.063 1.908 0.045 1.585 4H 2.200 1.968 0.060 1.793 0.080 6g 0.020 2.180 0.100 1.888 0.071 1.539 5H 2.200 1.983 0.075 1.813 0.100 6H 2.000 2.003 0.095 1.838 0.125 Tol. Class Major Dia. Pitch Dia. Minor Dia Copyright 2004, Industrial Press, Inc., New York, NY
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