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MARYLAND METRICS Technical Data Chart

Limiting Dimensions of Standard Series Threads for Commercial Bolts, Nuts, and Screws.

Nominal     External thread (bolt), mm Internal thread (nut), mm  
size
diam.
Pitch Basic
thread
Tol.   Major diameter Pitch diameter Minor diameter Tol. Minor diameter Pitch diameter Major
diam.
mm p mm desig
-nation
class Allow
-ance
Max Min Max Min Tol. Max* Min† class Min Max Min Max Tol. min
1.6 0.35 M1.6 6g 0.019 1.581 1.496 1.354 1.291 0.063 1.151 1.063 6H 1.221 1.321 1.373 1.458 0.085 1.6
1.8 0.35 M1.8 6g 0.019 1.781 1.696 1.554 1.491 0.063 1.351 1.263 6H 1.421 1.521 1.573 1.658 0.085 1.8
2 0.4 M2 6g 0.019 1.981 1.886 1.721 1.654 0.067 1.490 1.394 6H 1.567 1.679 1.740 1.830 0.090 2
2.2 0.45 M2.2 6g 0.020 2.180 2.080 1.888 1.817 0.071 1.628 1.525 6H 1.713 1.838 1.908 2.000 0.095 2.2
2.5 0.45 M2.5 6g 0.020 2.480 2.380 2.188 2.117 0.071 1.928 1.825 6H 2.013 2.138 2.208 2.303 0.095 2.5
3 0.5 M3 6g 0.020 2.980 2.874 2.655 2.580 0.075 2.367 2.256 6H 2.459 2.599 2.675 2.775 0.100 3
3.5 0.6 M3.5 6g 0.021 3.479 3.354 3.089 3.004 0.085 2.742 2.614 6H 2.850 3.010 3.110 3.222 0.112 3.5
4 0.7 M4 6g 0.022 3.978 3.838 3.523 3.433 0.090 3.119 2.979 6H 3.242 3.422 3.545 3.663 0.118 4
4.5 0.75 M4.5 6g 0.022 4.478 4.338 3.991 3.901 0.090 3.558 3.414 6H 3.688 3.878 4.013 4.131 0.118 4.5
5 0.8 M5 6g 0.024 4.976 4.826 4.456 4.361 0.095 3.994 3.841 6H 4.134 4.334 4.480 4.605 0.125 5
6 1 M6 6g 0.026 5.974 5.794 5.324 5.212 0.112 4.747 4.563 6H 4.917 5.153 5.350 5.500 0.150 6
7 1 M7 6g 0.026 6.974 6.794 6.234 6.212 0.112 5.747 5.563 6H 5.917 6.153 6.350 6.500 0.150 7
8 1.25 M8 6g 0.028 7.972 7.760 7.160 7.042 0.118 6.439 6.231 6H 6.647 6.912 7.188 7.348 0.160 8
8 1 M8 x 1 6g 0.026 7.974 7.794 7.324 7.212 0.112 6.747 6.563 6H 6.918 7.154 7.350 7.500 0.150 8
10 1.5 M10 6g 0.032 9.968 9.732 8.994 8.862 0.132 8.127 7.879 6H 8.376 8.676 9.026 9.206 0.180 10
10 1.25 M10 x 1.25 6g 0.028 9.972 9.760 9.160 9.042 0.118 8.439 8.231 6H 8.646 8.911 9.188 9.348 0.160 10
12 1.75 M12 6g 0.034 11.966 11.701 10.829 10.679 0.150 9.819 9.543 6H 10.106 10.441 10.863 11.063 0.200 12
12 1.25 M12 x 1.25 6g 0.028 11.972 11.760 11.160 11.028 0.118 10.439 10.217 6H 10.646 10.911 11.188 11.368 0.180 12
14 2 M14 6g 0.038 13.962 13.682 12.663 12.503 0.160 11.508 11.204 6H 11.835 12.210 12.701 12.913 0.212 14
14 1.5 M14 x 1.5 6g 0.032 13.968 13.732 12.994 12.854 0.140 12.127 11.879 6H 12.376 12.676 13.026 13.216 0.190 14
16 2 M16 6g 0.038 15.962 15.682 14.663 14.503 0.160 13.508 13.204 6H 13.385 14.210 14.701 14.913 0.212 16
16 1.5 M16 x 1.5 6g 0.032 15.968 15.732 14.994 14.854 0.140 14.127 13.879 6H 14.376 14.676 15.026 15.216 0.190 16
18 2.5 M18 6g 0.038 17.958 17.623 16.334 16.164 0.170 14.891 14.541 6H 15.294 15.744 16.376 16.600 0.224 18
18 1.5 M18 x 1.5 6g 0.032 17.968 17.732 16.994 15.854 0.140 16.127 15.879 6H 16.376 16.676 17.026 17.216 0.190 18
20 2.5 M20 6g 0.042 19.958 19.623 18.334 18.164 0.170 16.891 16.541 6H 17.294 17.744 18.376 18.600 0.224 20
20 1.5 M20 x 1.5 6g 0.032 19.968 19.732 18.994 18.854 0.140 18.127 17.879 6H 18.376 18.676 19.026 19.216 0.190 20
22 2.5 M22 6g 0.042 21.958 21.623 20.334 20.164 0.170 18.891 18.541 6H 19.294 19.744 20.376 20.600 0.224 22
22 1.5 M22 x 1.5 6g 0.032 21.968 21.732 20.994 20.854 0.140 20.127 19.879 6H 20.376 20.676 21.026 21.216 0.190 22
24 3 M24 6g 0.048 23.952 23.577 22.003 21.803 0.200 20.271 19.855 6H 20.752 21.252 22.051 22.316 0.265 24
24 2 M24 x 2 6g 0.038 23.962 23.682 22.663 22.493 0.170 21.508 21.194 6H 21.835 22.210 22.701 22.925 0.224 24
27 3 M27 6g 0.048 26.952 26.577 25.003 24.803 0.200 23.271 22.855 6H 23.752 24.252 25.051 25.316 0.265 27
27 2 M27 x 2 6g 0.038 26.962 26.682 25.663 25.493 0.170 24.508 24.194 6H 24.835 25.210 25.701 25.925 0.224 27
30 3.5 M30 6g 0.053 29.947 29.522 27.674 27.462 0.212 25.653 25.189 6H 26.211 26.771 27.727 28.007 0.280 30
30 2 M30 x 2 6g 0.038 29.962 29.682 28.663 28.493 0.170 27.508 27.194 6H 27.835 28.210 28.701 28.925 0.224 30
33 3.5 M33 6g 0.053 32.947 32.522 30.674 30.462 0.212 28.653 28.189 6H 29.211 29.771 30.727 31.007 0.280 33
33 2 M33 x 2 6g 0.038 32.962 32.682 31.663 31.493 0.170 30.508 30.194 6H 30.835 31.210 31.701 31.925 0.224 33
36 4 M36 6g 0.060 35.940 35.465 33.342 33.118 0.224 31.033 30.521 6H 31.670 32.270 33.402 33.702 0.300 36
36 3 M36 x 3 6g 0.048 35.952 35.577 34.003 33.803 0.200 32.271 31.855 6H 32.752 33.252 34.051 34.316 0.265 36
39 4 M39 6g 0.060 38.940 38.465 36.342 36.118 0.224 34.033 33.521 6H 34.670 35.270 36.402 36.702 0.300 39
39 3 M39 x 3 6g 0.048 38.952 38.577 37.003 36.803 0.200 35.271 34.855 6H 35.752 36.252 37.051 37.316 0.265 39
* Design form, see Figs. 2 and 5 of ANSI B1.13M-1979 (or Figs. 1 and 4 in 1983 revision).
Required for high- strength applications where rounded root is specified.
SOURCE : [Appeared in ASME/ SAE Interpretive document, Metric Screw Threads, B1.13 (Nov. 3, 1966), pp. 9, 10.] ISO 261- 1973, reproduced by permission.

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