Standard External Metric Thread and Fastener Sizes M20 - M55

ISO Hardware Engineering Data
Hardware Supplier and Manufacturers 
 Fastener and Screw / Bolt Design, Formula and Calculations

ANSI Screw and Nut Threads Size Chart

The following are standard metric external thread size 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.

Standard External Metric Thread and Fastener Sizes M1.6 - M18

Fastener Thread Designations and Definitions Pitch, Minor, Major Diameters

Engineering Slide Chart ANSI Screw & Hardware Selector

Engineering Hardware Slide Chart

Basic Fastener (External) Thread
Tolerance
Major Diameter
Pitch Diameter
Minor Diameter
Designation
Class
Max
Min
Max
Min
Max
Min
M20 × 2.5
6g
19.958
19.623
18.334
18.164
17.252
16.624
M20 × 2.5
4g6g
19.958
19.623
18.334
18.228
17.252
16.688
M20 × 1.5
6g
19.968
19.732
18.994
18.854
18.344
17.930
M20 × 1.5
4g6g
19.968
19.732
18.994
18.904
18.344
17.980
M20 × 1
6g
19.974
19.794
19.324
19.206
18.891
18.590
M20 × 1
4g6g
19.974
19.794
19.324
19.249
18.891
18.633
M22 × 2.5
6g
21.958
21.623
20.334
20.164
19.252
18.624
M22 × 1.5
6g
21.968
21.732
20.994
20.854
20.344
19.930
M22 × 1.5
4g6g
21.968
21.732
20.994
20.904
20.344
19.980
M24 × 3
6g
23.952
23.577
22.003
21.803
20.704
19.955
M24 × 3
4g6g
23.952
23.557
22.003
21.878
20.704
20.030
M24 × 2
6g
23.962
23.682
22.663
22.493
21.797
21.261
M24 × 2
4g6g
23.962
23.682
22.663
22.557
21.797
21.325
M25 × 1.5
6g
24.968
24.732
23.994
23.844
23.344
22.920
M25 × 1.5
4g6g
24.968
24.732
23.994
23.899
23.344
22.975
M27 × 3
6g
26.952
26.577
25.003
24.803
23.704
22.955
M27 × 2
6g
26.962
26.682
25.663
25.493
24.797
24.261
M27 × 2
4g6g
26.962
26.682
25.663
25.557
24.797
24.325
M30 × 3.5
6g
29.947
29.522
27.674
27.462
26.158
25.306
M30 × 3.5
4g6g
29.947
29.522
27.674
27.542
26.158
25.386
M30 × 2
6g
29.962
29.682
28.663
28.493
27.797
27.261
M30 × 2
4g6g
29.962
29.682
28.663
28.557
27.797
27.325
M30 × 1.5
6g
29.968
29.732
28.994
28.844
28.344
27.920
M30 × 1.5
4g6g
29.968
29.732
28.994
28.899
28.344
27.975
M33 × 2
6g
32.962
32.682
31.663
31.493
30.797
30.261
M33 × 2
4g6g
32.962
32.682
31.663
31.557
30.797
30.325
M35 × 1.5
6g
34.968
34.732
33.994
33.844
33.344
33.920
M36 × 4
6g
35.940
35.465
33.342
33.118
31.610
30.654
M36 × 4
4g6g
35.940
35.465
33.342
33.202
31.610
30.738
M36 × 2
6g
35.962
35.682
34.663
34.493
33.797
33.261
M36 × 2
4g6g
35.962
35.682
34.663
34.557
33.797
33.325
M39 × 2
6g
38.962
38.682
37.663
37.493
36.797
36.261
M39 × 2
4g6g
38.962
38.682
37.663
37.557
36.797
36.325
M40 × 1.5
6g
39.968
39.732
38.994
38.844
38.344
37.920
M40 × 1.5
4g6g
39.968
39.732
38.994
38.899
38.344
37.975
M42 × 4.5
6g
41.937
41.437
39.014
38.778
37.066
36.006
M42 × 4.5
4g6g
41.937
41.437
39.014
38.864
37.066
36.092
M42 × 2
6g
41.962
41.682
40.663
40.493
39.797
39.261
M42 × 2
4g6g
41.962
41.682
40.663
40.557
39.797
39.325
M45 × 1.5
6g
44.968
44.732
43.994
43.844
43.344
42.920
M45 × 1.5
4g6g
44.968
44.732
43.994
43.899
43.344
42.975
M48 × 5
6g
47.929
47.399
44.681
44.431
42.516
41.351
M48 × 5
4g6g
47.929
47.399
44.681
44.521
42.516
41.441
M48 × 2
6g
47.962
47.682
46.663
46.483
45.797
45.251
M48 × 2
4g6g
47.962
47.682
46.663
46.551
45.797
45.319
M50 × 1.5
6g
49.968
49.732
48.994
48.834
48.344
47.910
M50 × 1.5
4g6g
49.968
49.732
48.994
48.894
48.344
47.970
M55 × 1.5
6g
54.968
54.732
53.994
53.834
53.344
52.910

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