ISO Hardware Engineering Data Fastener and Screw / Bolt Design, Formula and Calculations
The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread design. All units in mm. These are the M Profile limiting Dimensionings.
Where:
H = P ( 31/2 / 2 ) = 0.866025 P or 0.125H = 0.108253P
ISO Metric
Pitch
External Threads
Tolerance
Major Dia
Pitch Dia
Minor Dia
Max
Min
Max
Min
Max
Min
M1.6 x 0.35
0.35
6g
1.581
1.496
1.354
1.291
1.202
1.075
M1.6 x 0.35
0.35
4g6g
1.581
1.496
1.354
1.314
1.202
1.098
M1.6 x 0.3
0.3
6g
1.582
1.507
1.387
1.342
1.257
1.157
M1.6 x 0.3
0.3
4g6g
1.582
1.507
1.387
1.359
1.257
1.174
M1.6 x 0.2
0.2
6g
1.583
1.527
1.453
1.403
1.366
1.280
M1.6 x 0.2
0.2
4g6g
1.583
1.527
1.453
1.421
1.366
1.298
M1.7 x 0.35
0.35
6g
1.681
1.596
1.454
1.391
1.302
1.175
M1.7 x 0.35
0.35
4g6g
1.681
1.596
1.454
1.414
1.302
1.198
M1.8 x 0.35
0.35
6g
1.781
1.696
1.554
1.491
1.402
1.275
M1.8 x 0.35
0.35
4g6g
1.781
1.696
1.554
1.514
1.402
1.298
M1.8 x 0.2
0.2
6g
1.783
1.727
1.653
1.603
1.566
1.480
M1.8 x 0.2
0.2
4g6g
1.783
1.727
1.653
1.621
1.566
1.498
M2 x 0.4
0.4
6g
1.981
1.886
1.721
1.654
1.548
1.408
M2 x 0.4
0.4
4g6g
1.981
1.886
1.721
1.679
1.548
1.433
M2 x 0.25
0.25
6g
1.982
1.915
1.820
1.764
1.711
1.610
M2 x 0.25
0.25
4g6g
1.982
1.915
1.820
1.784
1.711
1.630
M2.2 x 0.45
0.45
6g
2.180
2.080
1.888
1.817
1.693
1.540
M2.2 x 0.45
0.45
4g6g
2.180
2.080
1.888
1.843
1.693
1.566
M2.2 x 0.25
0.25
6g
2.182
2.115
2.020
1.964
1.911
1.810
M2.2 x 0.25
0.25
4g6g
2.182
2.115
2.020
1.984
1.911
1.830
M2.3 x 0.45
0.45
6g
2.280
2.180
1.988
1.917
1.793
1.640
M2.3 x 0.45
0.45
4g6g
2.280
2.180
1.988
1.943
1.793
1.666
M2.3 x 0.4
0.4
6g
2.281
2.186
2.021
1.954
1.848
1.708
M2.3 x 0.4
0.4
4g6g
2.281
2.186
2.021
1.979
1.848
1.733
M2.5 x 0.45
0.45
6g
2.480
2.380
2.188
2.117
1.993
1.840
M2.5 x 0.45
0.45
4g6g
2.480
2.380
2.188
2.143
1.993
1.866
M2.5 x 0.35
0.35
6g
2.481
2.396
2.254
2.191
2.102
1.975
M2.5 x 0.35
0.35
4g6g
2.481
2.396
2.254
2.214
2.102
1.998
M2.6 x 0.45
0.45
6g
2.580
2.480
2.288
2.217
2.093
1.940
M2.6 x 0.45
0.45
4g6g
2.580
2.480
2.288
2.243
2.093
1.966
M3 x 0.5
0.5
6g
2.980
2.874
2.655
2.580
2.439
2.272
M3 x 0.5
0.5
4g6g
2.980
2.874
2.655
2.607
2.439
2.299
M3 x 0.35
0.35
6g
2.981
2.896
2.754
2.687
2.602
2.471
M3 x 0.35
0.35
4g6g
2.981
2.896
2.754
2.712
2.602
2.496
M3.5 x 0.6
0.6
6g
3.479
3.354
3.089
3.004
2.829
2.635
M3.5 x 0.6
0.6
4g6g
3.479
3.354
3.089
3.036
2.829
2.667
M3.5 x 0.35
0.35
6g
3.481
3.396
3.254
3.187
3.102
2.971
M3.5 x 0.35
0.35
4g6g
3.481
3.396
3.254
3.212
3.102
2.996
M4 x 0.7
0.7
6g
3.978
3.838
3.523
3.433
3.220
3.002
M4 x 0.7
0.7
4g6g
3.978
3.838
3.523
3.467
3.220
3.036
M4 x 0.5
0.5
6g
3.980
3.874
3.655
3.580
3.439
3.272
M4 x 0.5
0.5
4g6g
3.980
3.874
3.655
3.607
3.439
3.299
M4.5 x 0.75
0.75
6g
4.478
4.338
3.991
3.901
3.666
3.439
M4.5 x 0.75
0.75
4g6g
4.478
4.338
3.991
3.935
3.666
3.473
M4.5 x 0.5
0.5
6g
4.480
4.374
4.155
4.080
3.939
3.772
M4.5 x 0.5
0.5
4g6g
4.480
4.374
4.155
4.107
3.939
3.799
M5 x 0.8
0.8
6g
4.976
4.826
4.456
4.361
4.110
3.869
M5 x 0.8
0.8
4g6g
4.976
4.826
4.456
4.396
4.110
3.904
M5 x 0.5
0.5
6g
4.980
4.874
4.655
4.580
4.439
4.272
M5 x 0.5
0.5
4g6g
4.980
4.874
4.655
4.607
4.439
4.299
M5.5 x 0.5
0.5
6g
5.480
5.374
5.155
5.065
4.939
4.757
M5.5 x 0.5
0.5
4g6g
5.480
5.374
5.155
5.099
4.939
4.791
M6 x 1
1
6g
5.974
5.794
5.324
5.212
4.891
4.596
M6 x 1
1
4g6g
5.974
5.794
5.324
5.253
4.891
4.637
M6 x 0.8
0.8
6g
5.976
5.826
5.456
5.376
5.110
4.884
M6 x 0.8
0.8
4g6g
5.976
5.826
5.456
5.406
5.110
4.914
M6 x 0.75
0.75
6g
5.978
5.838
5.491
5.391
5.166
4.929
M6 x 0.75
0.75
4g6g
5.978
5.838
5.491
5.428
5.166
4.966
M6 x 0.7
0.7
6g
5.978
5.838
5.523
5.428
5.220
4.997
M6 x 0.7
0.7
4g6g
5.978
5.838
5.523
5.463
5.220
5.032
M6 x 0.5
0.5
6g
5.980
5.874
5.655
5.570
5.439
5.262
M6 x 0.5
0.5
4g6g
5.980
5.874
5.655
5.602
5.439
5.294
M7 x 1
1
6g
6.974
6.794
6.324
6.212
5.891
5.596
M7 x 1
1
4g6g
6.974
6.794
6.324
6.253
5.891
5.637
M7 x 0.75
0.75
6g
6.978
6.838
6.491
6.391
6.166
5.929
M7 x 0.75
0.75
4g6g
6.978
6.838
6.491
6.428
6.166
5.966
M7 x 0.5
0.5
6g
6.980
6.874
6.655
6.570
6.439
6.262
M7 x 0.5
0.5
4g6g
6.980
6.874
6.655
6.602
6.439
6.294
M8 x 1.25
1.25
6g
7.972
7.760
7.160
7.042
6.619
6.272
M8 x 1.25
1.25
4g6g
7.972
7.760
7.160
7.085
6.619
6.315
M8 x 1
1
6g
7.974
7.794
7.324
7.212
6.891
6.596
M8 x 1
1
4g6g
7.974
7.794
7.324
7.253
6.891
6.637
M8 x 0.8
0.8
6g
7.976
7.826
7.456
7.350
7.110
6.858
M8 x 0.8
0.8
4g6g
7.976
7.826
7.456
7.389
7.110
6.897
M8 x 0.75
0.75
6g
7.978
7.838
7.491
7.391
7.166
6.929
M8 x 0.75
0.75
4g6g
7.978
7.838
7.491
7.428
7.166
6.966
M8 x 0.5
0.5
6g
7.980
7.874
7.655
7.570
7.439
7.262
M8 x 0.5
0.5
4g6g
7.980
7.874
7.655
7.602
7.439
7.294
M9 x 1.25
1.25
6g
8.972
8.760
8.160
8.042
7.619
7.272
M9 x 1.25
1.25
4g6g
8.972
8.760
8.160
8.085
7.619
7.315
M9 x 1
1
6g
8.974
8.794
8.324
8.212
7.891
7.596
M9 x 1
1
4g6g
8.974
8.794
8.324
8.253
7.891
7.637
M9 x 0.75
0.75
6g
8.978
8.838
8.491
8.391
8.166
7.929
M9 x 0.75
0.75
4g6g
8.978
8.838
8.491
8.428
8.166
7.966
M9 x 0.5
0.5
6g
8.980
8.874
8.655
8.570
8.439
8.262
M9 x 0.5
0.5
4g6g
8.980
8.874
8.655
8.602
8.439
8.294
M10 x 1.5
1.5
6g
9.968
9.732
8.994
8.862
8.344
7.938
M10 x 1.5
1.5
4g6g
9.968
9.732
8.994
8.909
8.344
7.985
M10 x 1.25
1.25
6g
9.972
9.760
9.160
9.042
8.619
8.272
M10 x 1.25
1.25
4g6g
9.972
9.760
9.160
9.085
8.619
8.315
M10 x 1.12
1.12
6g
9.973
9.783
9.246
9.128
8.761
8.438
M10 x 1.12
1.12
4g6g
9.973
9.783
9.246
9.171
8.761
8.481
M10 x 1
1
6g
9.974
9.794
9.324
9.212
8.891
8.596
M10 x 1
1
4g6g
9.974
9.794
9.324
9.253
8.891
8.637
M10 x 0.75
0.75
6g
9.978
9.838
9.491
9.391
9.166
8.929
M10 x 0.75
0.75
4g6g
9.978
9.838
9.491
9.428
9.166
8.966
M10 x 0.5
0.5
6g
9.980
9.874
9.655
9.570
9.439
9.262
M10 x 0.5
0.5
4g6g
9.980
9.874
9.655
9.602
9.439
9.294
M11 x 1.5
1.5
6g
10.968
10.732
9.994
9.862
9.344
8.938
M11 x 1.5
1.5
4g6g
10.968
10.732
9.994
9.911
9.344
8.987
M11 x 1
1
6g
10.974
10.794
10.324
10.212
9.891
9.596
M11 x 1
1
4g6g
10.974
10.794
10.324
10.253
9.891
9.637
M11 x 0.75
0.75
6g
10.978
10.838
10.491
10.391
10.166
9.929
M11 x 0.75
0.75
4g6g
10.978
10.838
10.491
10.428
10.166
9.966
M11 x 0.5
0.5
6g
10.980
10.874
10.655
10.570
10.439
10.262
M11 x 0.5
0.5
4g6g
10.980
10.874
10.655
10.602
10.439
10.294
M12 x 1.75
1.75
6g
11.966
11.701
10.829
10.679
10.072
9.601
M12 x 1.75
1.75
4g6g
11.966
11.701
10.829
10.734
10.072
9.656
M12 x 1.5
1.5
6g
11.968
11.732
10.994
10.854
10.344
9.930
M12 x 1.25
1.25
6g
11.972
11.760
11.160
11.028
10.619
10.258
M12 x 1.25
1.25
4g6g
11.972
11.760
11.160
11.075
10.619
10.305
M12 x 1
1
6g
11.974
11.794
11.324
11.206
10.891
10.590
M12 x 1
1
4g6g
11.974
11.794
11.324
11.249
10.891
10.633
M12 x 0.75
0.75
6g
11.978
11.838
11.491
11.385
11.166
10.923
M12 x 0.75
0.75
4g6g
11.978
11.838
11.491
11.424
11.166
10.962
M12 x 0.5
0.5
6g
11.980
11.874
11.655
11.565
11.439
11.257
M12 x 0.5
0.5
4g6g
11.980
11.874
11.655
11.598
11.439
11.290
M14 x 2
2
6g
13.962
13.682
12.663
12.503
11.797
11.271
M14 x 2
2
4g6g
13.962
13.682
12.663
12.563
11.797
11.331
M14 x 1.5
1.5
6g
13.968
13.732
12.994
12.854
12.344
11.930
M14 x 1.5
1.5
4g6g
13.968
13.732
12.994
12.904
12.344
11.980
M14 x 1.25
1.25
6g
13.972
13.760
13.160
13.028
12.619
12.258
M14 x 1.25
1.25
4g6g
13.972
13.760
13.160
13.075
12.619
12.305
M14 x 1
1
6g
13.974
13.794
13.324
13.206
12.891
12.590
M14 x 1
1
4g6g
13.974
13.794
13.324
13.250
12.891
12.634
M14 x 0.75
0.75
6g
13.978
13.838
13.491
13.385
13.166
12.923
M14 x 0.75
0.75
4g6g
13.978
13.838
13.491
13.424
13.166
12.962
M14 x 0.5
0.5
6g
13.980
13.874
13.655
13.565
13.439
13.257
M14 x 0.5
0.5
4g6g
13.980
13.874
13.655
13.598
13.439
13.290
M15 x 1.5
1.5
6g
14.968
14.732
13.994
13.854
13.344
12.930
M15 x 1.5
1.5
4g6g
14.968
14.732
13.994
13.904
13.344
12.980
M15 x 1
1
6g
14.974
14.794
14.324
14.206
13.891
13.590
M15 x 1
1
4g6g
14.974
14.794
14.324
14.249
13.891
13.633
M16 x 2
2
6g
15.962
15.682
14.663
14.503
13.797
13.271
M16 x 2
2
4g6g
15.962
15.682
14.663
14.563
13.797
13.331
M16 x 1.6
1.6
6g
15.968
15.756
14.929
14.824
14.236
13.838
M16 x 1.6
1.6
4g6g
15.968
15.756
14.929
14.863
14.236
13.877
M16 x 1.5
1.5
6g
15.968
15.732
14.994
14.854
14.344
13.930
M16 x 1.5
1.5
4g6g
15.968
15.732
14.994
14.904
14.344
13.980
M16 x 1.25
1.25
6g
15.972
15.760
15.160
15.028
14.619
14.258
M16 x 1.25
1.25
4g6g
15.972
15.760
15.160
15.075
14.619
14.305
M16 x 1
1
6g
15.974
15.794
15.324
15.206
14.891
14.590
M16 x 1
1
4g6g
15.974
15.794
15.324
15.249
14.891
14.633
M16 x 0.75
0.75
6g
15.978
15.838
15.491
15.385
15.166
14.923
M16 x 0.75
0.75
4g6g
15.978
15.838
15.491
15.424
15.166
14.962
M16 x 0.5
0.5
6g
15.980
15.874
15.655
15.565
15.439
15.257
M16 x 0.5
0.5
4g6g
15.980
15.874
15.655
15.599
15.439
15.291
M17 x 1.5
1.5
6g
16.968
16.732
15.994
15.854
15.344
14.930
M17 x 1.5
1.5
4g6g
16.968
16.732
15.994
15.904
15.344
14.980
M17 x 1
1
6g
16.974
16.794
16.324
16.206
15.891
15.590
M17 x 1
1
4g6g
16.974
16.794
16.324
16.249
15.891
15.633
M18 x 2.5
2.5
6g
17.958
17.623
16.334
16.164
15.252
14.624
M18 x 2.5
2.5
4g6g
17.958
17.623
16.334
16.228
15.252
14.688
M18 x 2
2
6g
17.962
17.682
16.663
16.503
15.797
15.271
M18 x 2
2
4g6g
17.962
17.682
16.663
16.563
15.797
15.331
M18 x 1.5
1.5
6g
17.968
17.732
16.994
16.854
16.344
15.930
M18 x 1.5
1.5
4g6g
17.968
17.732
16.994
16.904
16.344
15.980
M18 x 1.25
1.25
6g
17.972
17.760
17.160
17.028
16.619
16.258
M18 x 1.25
1.25
4g6g
17.972
17.760
17.160
17.075
16.619
16.305
M18 x 1
1
6g
17.974
17.794
17.324
17.206
16.891
16.590
M18 x 1
1
4g6g
17.974
17.794
17.324
17.249
16.891
16.633
M18 x 0.75
0.75
6g
17.978
17.838
17.491
17.385
17.166
16.923
M18 x 0.75
0.75
4g6g
17.978
17.838
17.491
17.424
17.166
16.962
M18 x 0.5
0.5
6g
17.980
17.874
17.655
17.565
17.439
17.257
M18 x 0.5
0.5
4g6g
17.980
17.874
17.655
17.599
17.439
17.291
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