ISO Hardware Engineering Data Fastener and Screw / Bolt Design, Formula and Calculations
ANSI Screw and Nut Threads Size Chart
The following are metric external thread size table chart for sizes M20 to M55 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 designs. All units in mm.
ISO Metric
Pitch
External Threads
Tolerance
Major Dia
Pitch Dia
Minor Dia
Max
Min
Max
Min
Max
Min
M20x2.5
2.5
6g
19.958
19.623
18.334
18.164
17.252
16.624
M20x2.5
2.5
4g6g
19.958
19.623
18.334
18.228
17.252
16.688
M20x2
2
6g
19.962
19.682
18.663
18.503
17.797
17.271
M20x2
2
4g6g
19.962
19.682
18.663
18.562
17.797
17.330
M20x1.5
1.5
6g
19.968
19.732
18.994
18.854
18.344
17.930
M20x1.5
1.5
4g6g
19.968
19.732
18.994
18.904
18.344
17.980
M20x1
1
6g
19.974
19.794
19.324
19.206
18.891
18.590
M20x1
1
4g6g
19.974
19.794
19.324
19.249
18.891
18.633
M20x0.75
0.75
6g
19.978
19.838
19.491
19.385
19.166
18.923
M20x0.75
0.75
4g6g
19.978
19.838
19.491
19.424
19.166
18.962
M20x0.5
0.5
6g
19.980
19.874
19.655
19.565
19.439
19.257
M20x0.5
0.5
4g6g
19.980
19.874
19.655
19.599
19.439
19.291
M22x3
3
6g
21.952
21.577
20.003
19.818
18.704
17.970
M22x3
3
4g6g
21.952
21.577
20.003
19.885
18.704
18.037
M22x2.5
2.5
6g
21.958
21.623
20.334
20.164
19.252
18.624
M22x2.5
2.5
4g6g
21.958
21.623
20.334
20.234
19.252
18.694
M22x2
2
6g
21.962
21.682
20.663
20.503
19.797
19.271
M22x2
2
4g6g
21.962
21.682
20.663
20.563
19.797
19.331
M22x1.5
1.5
6g
21.968
21.732
20.994
20.854
20.344
19.930
M22x1.5
1.5
4g6g
21.968
21.732
20.994
20.904
20.344
19.980
M22x1
1
6g
21.974
21.794
21.324
21.206
20.891
20.590
M22x1
1
4g6g
21.974
21.794
21.324
21.249
20.891
20.633
M22x0.75
0.75
6g
21.978
21.838
21.491
21.385
21.166
20.923
M22x0.75
0.75
4g6g
21.978
21.838
21.491
21.424
21.166
20.962
M22x0.5
0.5
6g
21.980
21.874
21.655
21.565
21.439
21.257
M22x0.5
0.5
4g6g
21.980
21.874
21.655
21.598
21.439
21.290
M24x3
3
6g
23.952
23.577
22.003
21.803
20.704
19.955
M24x3
3
4g6g
23.952
23.557
22.003
21.878
20.704
20.030
M24x2.5
2.5
6g
23.958
23.623
22.334
22.144
21.252
20.604
M24x2.5
2.5
4g6g
23.958
23.623
22.334
22.214
21.252
20.674
M24x2
2
6g
23.962
23.682
22.663
22.493
21.797
21.261
M24x2
2
4g6g
23.962
23.682
22.663
22.557
21.797
21.325
M24x1.5
1.5
6g
23.968
23.732
22.994
22.844
22.344
21.920
M24x1.5
1.5
4g6g
23.968
23.732
22.994
22.899
22.344
21.975
M24x1
1
6g
23.974
23.794
23.324
23.199
22.891
22.583
M24x1
1
4g6g
23.974
23.794
23.324
23.244
22.891
22.628
M24x0.75
0.75
6g
23.978
23.838
23.491
23.379
23.166
22.917
M24x0.75
0.75
4g6g
23.978
23.838
23.491
23.420
23.166
22.958
M25x2
2
6g
24.962
24.682
23.663
23.493
22.797
22.261
M25x2
2
4g6g
24.962
24.682
23.663
23.557
22.797
22.325
M25x1.5
1.5
6g
24.968
24.732
23.994
23.844
23.344
22.920
M25x1.5
1.5
4g6g
24.968
24.732
23.994
23.899
23.344
22.975
M25x1
1
6g
24.974
24.794
24.324
24.199
23.891
23.583
M25x1
1
4g6g
24.974
24.794
24.324
24.244
23.891
23.628
M26x1.5
1.5
6g
25.968
25.732
24.994
24.844
24.344
23.920
M26x1.5
1.5
4g6g
25.968
25.732
24.994
24.899
24.344
23.975
M27x3
3
6g
26.952
26.577
25.003
24.803
23.704
22.955
M27x3
3
4g6g
26.952
26.577
25.003
24.878
23.704
23.030
M27x2
2
6g
26.962
26.682
25.663
25.493
24.797
24.261
M27x2
2
4g6g
29.962
26.682
25.663
25.557
24.797
24.325
M27x1.5
1.5
6g
26.968
26.732
25.994
25.844
25.344
24.920
M27x1.5
1.5
4g6g
26.968
26.732
25.994
25.899
25.344
24.975
M27x1
1
6g
26.974
26.794
26.324
26.199
25.891
25.583
M27x1
1
4g6g
26.974
26.794
26.324
26.244
25.891
25.628
M27x0.75
0.75
6g
26.978
26.838
26.491
26.379
26.166
25.917
M27x0.75
0.75
4g6g
26.978
26.838
26.491
26.420
26.166
25.958
M28x2
2
6g
27.962
27.682
26.663
26.493
25.797
25.261
M28x2
2
4g6g
27.962
27.682
26.663
26.557
25.797
25.325
M28x1.5
1.5
6g
27.968
27.732
26.994
26.844
26.344
25.920
M28x1.5
1.5
4g6g
27.968
27.732
26.994
26.899
26.344
25.975
M28x1
1
6g
27.974
27.794
27.324
27.199
26.891
26.583
M28x1
1
4g6g
27.974
27.794
27.324
27.244
26.891
26.628
M30x3.5
3.5
6g
29.947
29.522
27.674
27.462
26.158
25.306
M30x3.5
3.5
4g6g
29.947
29.522
27.674
27.542
26.158
25.386
M30x3
3
6g
29.952
29.577
28.003
27.803
26.704
25.955
M30x3
3
4g6g
29.952
29.577
28.003
27.878
26.704
26.030
M30x2.5
2.5
6g
29.958
29.623
28.334
28.144
27.252
26.604
M30x2.5
2.5
4g6g
29.958
29.623
28.334
28.214
27.252
26.674
M30x2
2
6g
29.962
29.682
28.663
28.493
27.797
27.261
M30x2
2
4g6g
29.962
29.682
28.663
28.557
27.797
27.325
M30x1.5
1.5
6g
29.968
29.732
28.994
28.844
28.344
27.920
M30x1.5
1.5
4g6g
29.968
29.732
28.994
28.899
28.344
27.975
M30x1
1
6g
29.974
29.794
29.324
29.199
28.891
28.583
M30x1
1
4g6g
29.974
29.794
29.324
29.244
28.891
28.628
M30x0.75
0.75
6g
29.978
29.838
29.491
29.379
29.166
28.917
M30x0.75
0.75
4g6g
29.978
29.838
29.491
29.420
29.166
28.958
M32x2
2
6g
31.962
31.682
30.663
30.493
29.797
29.261
M32x2
2
4g6g
31.962
31.682
30.663
30.557
29.797
29.325
M32x1.5
1.5
6g
31.968
31.732
30.994
30.844
30.344
29.920
M32x1.5
1.5
4g6g
31.968
31.732
30.994
30.899
30.344
29.975
M33x3.5
3.5
6g
32.968
32.543
30.695
30.483
29.179
28.327
M33x3.5
3.5
4g6g
32.968
32.543
30.695
30.563
29.179
28.407
M33x3
3
6g
32.952
32.577
31.003
30.803
29.704
28.955
M33x3
3
4g6g
32.952
32.577
31.003
30.878
29.704
29.030
M33x2
2
6g
32.962
32.682
31.663
31.493
30.797
30.261
M33x2
2
4g6g
32.962
32.682
31.663
31.557
30.797
30.325
M33x1.5
1.5
6g
32.968
32.732
31.994
31.844
31.344
30.920
M33x1.5
1.5
4g6g
32.968
32.732
31.994
31.899
31.344
30.975
M33x1
1
6g
32.974
32.794
32.324
32.199
31.891
31.583
M33x1
1
4g6g
32.974
32.794
32.324
32.244
31.891
31.628
M33x0.75
0.75
6g
32.978
32.838
32.491
32.379
32.166
31.917
M33x0.75
0.75
4g6g
32.978
32.838
32.491
32.420
32.166
31.958
M35x1.5
1.5
6g
34.968
34.732
33.994
33.844
33.344
33.920
M35x1.5
1.5
4g6g
34.968
34.732
33.994
33.899
33.344
32.975
M36x4
4
6g
35.940
35.465
33.342
33.118
31.610
30.654
M36x4
4
4g6g
35.940
35.465
33.342
33.202
31.610
30.738
M36x3
3
6g
35.952
35.577
34.003
33.803
32.704
31.955
M36x3
3
4g6g
35.952
35.577
34.003
33.878
32.704
32.030
M36x2
2
6g
35.962
35.682
34.663
34.493
33.797
33.261
M36x2
2
4g6g
35.962
35.682
34.663
34.557
33.797
33.325
M36x1.5
1.5
6g
35.968
35.732
34.994
34.844
34.344
33.920
M36x1.5
1.5
4g6g
35.968
35.732
34.994
34.899
34.344
33.975
M36x1
1
6g
35.974
35.794
35.324
35.199
34.891
34.583
M36x1
1
4g6g
35.974
35.794
35.324
35.244
34.891
34.628
M38x1.5
1.5
6g
37.968
37.732
36.994
36.844
36.344
35.920
M38x1.5
1.5
4g6g
37.968
37.732
36.994
36.899
36.344
35.975
M39x4
4
6g
38.940
38.465
36.342
36.118
34.610
33.654
M39x4
4
4g6g
38.940
38.465
36.342
36.202
34.610
33.738
M39x3
3
6g
38.952
38.577
37.003
36.803
35.704
34.955
M39x3
3
4g6g
38.952
38.577
37.003
36.878
35.704
35.030
M39x2
2
6g
38.962
38.682
37.663
37.493
36.797
36.261
M39x2
2
4g6g
38.962
38.682
37.663
37.557
36.797
36.325
M39x1.5
1.5
6g
38.968
38.732
37.994
37.844
37.344
36.920
M39x1.5
1.5
4g6g
38.968
38.732
37.994
37.899
37.344
36.975
M39x1
1
6g
38.974
38.794
38.324
38.199
37.891
37.583
M39x1
1
4g6g
38.974
38.794
38.324
38.244
37.891
37.628
M40x3
3
6g
39.952
39.577
38.003
37.803
36.704
35.955
M40x3
3
4g6g
39.952
39.577
38.003
37.878
36.704
36.030
M40x2.5
2.5
6g
39.958
39.623
38.334
38.144
37.252
36.604
M40x2.5
2.5
4g6g
39.958
39.623
38.334
38.215
37.252
36.674
M40x2
2
6g
39.962
39.682
38.663
38.493
37.797
37.261
M40x2
2
4g6g
39.962
39.682
38.663
38.557
37.797
37.325
M40x1.5
1.5
6g
39.968
39.732
38.994
38.844
38.344
37.920
M40x1.5
1.5
4g6g
39.968
39.732
38.994
38.899
38.344
37.975
M42x4.5
4.5
6g
41.937
41.437
39.014
38.778
37.066
36.006
M42x4.5
4.5
4g6g
41.937
41.437
39.014
38.864
37.066
36.092
M42x4
4
6g
41.940
41.465
39.342
39.118
37.610
36.654
M42x4
4
4g6g
41.940
41.465
39.342
39.202
37.610
36.738
M42x3
3
6g
41.952
41.577
40.003
39.803
38.704
37.955
M42x3
3
4g6g
41.952
41.577
40.003
39.878
38.704
38.030
M42x2
2
6g
41.962
41.682
40.663
40.493
39.797
39.261
M42x2
2
4g6g
41.962
41.682
40.663
40.557
39.797
39.325
M42x1.5
1.5
6g
41.968
41.732
40.994
40.844
40.344
39.920
M42x1.5
1.5
4g6g
41.968
41.732
40.994
40.899
40.344
39.975
M42x1
1
6g
41.974
41.794
41.324
41.199
40.891
40.583
M42x1
1
4g6g
41.974
41.794
41.324
41.244
40.891
40.628
M45x4.5
4.5
6g
44.937
44.437
42.014
41.778
40.066
39.006
M45x4.5
4.5
4g6g
44.937
44.437
42.014
41.864
40.066
39.092
M45x4
4
6g
44.940
44.465
42.342
42.118
40.610
39.654
M45x4
4
4g6g
44.940
44.465
42.342
42.202
40.610
39.738
M45x3
3
6g
44.952
44.577
43.003
42.803
41.704
40.955
M45x3
3
4g6g
44.952
44.577
43.003
42.878
41.704
41.030
M45x2
2
6g
44.962
44.682
43.663
43.493
42.797
42.261
M45x2
2
4g6g
44.962
44.682
43.663
43.557
42.797
42.325
M45x1.5
1.5
6g
44.968
44.732
43.994
43.844
43.344
42.920
M45x1.5
1.5
4g6g
44.968
44.732
43.994
43.899
43.344
42.975
M45x1
1
6g
44.974
44.794
44.324
44.199
43.891
43.583
M45x1
1
4g6g
44.974
44.794
44.324
44.244
43.891
43.628
M48x5
5
6g
47.929
47.399
44.681
44.431
42.516
41.351
M48x5
5
4g6g
47.929
47.399
44.681
44.521
42.516
41.441
M48x4
4
6g
47.940
47.465
45.342
45.106
43.610
42.642
M48x4
4
4g6g
47.940
47.465
45.342
45.192
43.610
42.728
M48x3
3
6g
47.952
47.577
46.003
45.791
44.704
43.943
M48x3
3
4g6g
47.952
47.577
46.003
45.871
44.704
44.023
M48x2
2
6g
47.962
47.682
46.663
46.483
45.797
45.251
M48x2
2
4g6g
47.962
47.682
46.663
46.551
45.797
45.319
M48x1.5
1.5
6g
47.968
47.732
46.994
46.834
46.344
45.910
M48x1.5
1.5
4g6g
47.968
47.732
46.994
46.894
46.344
45.970
M50x4
4
6g
49.940
49.465
47.342
47.106
45.610
44.642
M50x4
4
4g6g
49.940
49.465
47.342
47.192
45.610
44.728
M50x3
3
6g
49.952
49.577
48.003
47.791
46.704
45.943
M50x3
3
4g6g
49.952
49.577
48.003
47.871
46.704
46.023
M50x2
2
6g
49.962
49.682
48.663
48.483
47.797
47.251
M50x2
2
4g6g
49.962
49.682
48.663
48.551
47.797
47.319
M50x1.5
1.5
6g
49.968
49.732
48.994
48.834
48.344
47.910
M50x1.5
1.5
4g6g
49.968
49.732
48.994
48.894
48.344
47.970
M52x5
5
6g
51.929
51.399
48.681
48.445
46.516
45.365
M52x5
5
4g6g
51.929
51.399
48.681
48.531
46.516
45.451
M52x4
4
6g
51.940
51.465
49.342
49.106
47.610
46.642
M52x4
4
4g6g
51.940
51.465
49.342
49.192
47.610
46.728
M52x3
3
6g
51.952
51.577
50.003
49.791
48.704
47.943
M52x3
3
4g6g
51.952
51.577
50.003
49.871
48.704
48.023
M52x2
2
6g
51.962
51.682
50.663
50.483
49.797
49.251
M52x2
2
4g6g
51.962
51.682
50.663
50.551
49.797
49.319
M52x1.5
1.5
6g
51.968
51.732
50.994
50.834
50.344
49.910
M52x1.5
1.5
4g6g
51.968
51.732
50.994
50.894
50.344
49.970
M55x4
4
6g
54.940
54.465
52.342
52.106
50.610
49.642
M55x4
4
4g6g
54.940
54.465
52.342
52.192
50.610
49.728
M55x3
3
6g
54.952
54.577
53.003
52.791
51.704
50.943
M55x3
3
4g6g
54.952
54.577
53.003
52.871
51.704
51.023
M55x2
2
6g
54.962
54.682
53.663
53.483
52.797
52.251
M55x2
2
4g6g
54.962
54.682
53.663
53.551
52.797
52.319
M55x1.5
1.5
6g
54.968
54.732
53.994
53.834
53.344
52.910
M55x1.5
1.5
4g6g
54.968
54.732
53.994
53.894
53.344
52.970
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