External Metric ISO Thread Table Chart Sizes M56 - M78

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 metric external thread size table chart for sizes M 56 to M 78 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.

Engineering Slide Chart ANSI Screw & Hardware Selector

Engineering Hardware Slide Chart

ISO Metric Thread Designation
Pitch
External Threads
Tolerance Class
Major Dia
Pitch Dia
Minor Dia
Max
Min
Max
Min
Max
Min
M56x6.5
6.5
6g
55.915
55.285
51.693
51.393
48.879
47.389
M56x6.5
6.5
4g6g
55.915
55.285
51.693
51.503
48.879
47.499
M56x5.5
5.5
6g
55.925
55.365
52.353
52.088
49.971
48.700
M56x5.5
5.5
4g6g
55.925
55.365
52.353
52.183
49.971
48.795
M56x4
4
6g
55.940
55.465
53.342
53.106
51.610
50.642
M56x4
4
4g6g
55.940
55.465
53.342
53.192
51.610
50.728
M56x3
3
6g
55.952
55.577
54.003
53.791
52.704
51.943
M56x3
3
4g6g
55.952
55.577
54.003
53.871
52.704
52.023
M56x2
2
6g
55.962
55.682
54.663
54.483
53.797
53.251
M56x2
2
4g6g
55.962
55.682
54.663
54.551
53.797
53.319
M56x1.5
1.5
6g
55.968
55.732
54.994
54.834
54.344
53.910
M56x1.5
1.5
4g6g
55.968
55.732
54.994
54.894
54.344
53.970
M56x1
1
6g
55.974
55.794
55.324
55.184
54.891
54.568
M56x1
1
4g6g
55.974
55.794
55.324
55.234
54.891
54.618
M58x4
4
6g
57.940
57.465
55.342
55.106
53.610
52.642
M58x4
4
4g6g
57.940
57.465
55.342
55.192
53.610
52.728
M58x3
3
6g
57.952
57.577
56.003
55.791
54.704
53.943
M58x3
3
4g6g
57.952
57.577
56.003
55.871
54.704
54.023
M58x2
2
6g
57.962
57.682
56.663
56.483
55.797
55.251
M58x2
2
4g6g
57.962
57.682
56.663
56.551
55.797
55.319
M58x1.5
1.5
6g
57.968
57.732
56.994
56.834
56.344
55.910
M58x1.5
1.5
4g6g
57.968
57.732
56.994
56.894
56.344
55.970
M60x5.5
5.5
6g
59.925
59.365
56.353
56.088
53.971
52.700
M60x5.5
5.5
4g6g
59.925
59.365
56.353
56.183
53.971
52.795
M60x4
4
6g
59.940
59.465
57.342
57.106
55.610
54.642
M60x4
4
4g6g
59.940
59.465
57.342
57.192
55.610
54.728
M60x3
3
6g
59.952
59.577
58.003
57.791
56.704
55.943
M60x3
3
4g6g
59.952
59.577
58.003
57.871
56.704
56.023
M60x2
2
6g
59.962
59.682
58.663
58.483
57.797
57.251
M60x2
2
4g6g
59.962
59.682
58.663
58.551
57.797
57.319
M60x1.5
1.5
6g
59.968
59.732
58.994
58.834
58.344
57.910
M60x1.5
1.5
4g6g
59.968
59.732
58.994
58.894
58.344
57.970
M60x1
1
6g
59.974
59.794
59.324
59.184
58.891
58.568
M60x1
1
4g6g
59.974
59.794
59.324
59.234
58.891
58.618
M62x4
4
6g
61.940
61.465
59.342
59.106
57.610
56.642
M62x4
4
4g6g
61.940
61.465
59.342
59.192
57.610
56.728
M62x3
3
6g
61.952
61.577
60.003
59.791
58.704
57.943
M62x3
3
4g6g
61.952
61.577
60.003
59.871
58.704
58.023
M62x2
2
6g
61.962
61.682
60.663
60.483
59.797
59.251
M62x2
2
4g6g
61.962
61.682
60.663
60.551
59.797
59.319
M62x1.5
1.5
6g
61.968
61.732
60.994
60.834
60.344
59.910
M62x1.5
1.5
4g6g
61.968
61.732
60.994
60.894
60.344
59.970
M63x1.5
1.5
6g
62.968
62.732
61.994
61.834
61.344
60.910
M63x1.5
1.5
4g6g
62.968
62.732
61.994
61.894
61.344
60.970
M64x6
6
6g
63.920
63.320
60.023
59.743
57.425
56.047
M64x6
6
4g6g
63.920
63.320
60.023
59.843
57.425
56.147
M64x5.5
5.5
6g
63.925
63.365
60.353
60.088
57.971
56.700
M64x5.5
5.5
4g6g
63.925
63.365
60.353
60.183
57.971
56.795
M64x4
4
6g
63.940
63.465
61.342
61.106
59.610
58.642
M64x4
4
4g6g
63.940
63.465
61.342
61.192
59.610
58.728
M64x3
3
6g
63.952
63.577
62.003
61.791
60.704
59.943
M64x3
3
4g6g
63.952
63.577
62.003
61.871
60.704
60.023
M64x2
2
6g
63.962
63.682
62.663
62.483
61.797
61.251
M64x2
2
4g6g
63.962
63.682
62.663
62.551
61.797
61.319
M64x1.5
1.5
6g
63.968
63.732
62.994
62.834
62.344
61.910
M64x1.5
1.5
4g6g
63.968
63.732
62.994
62.894
62.344
61.970
M64x1
1
6g
63.974
63.794
63.324
63.184
62.891
62.568
M64x1
1
4g6g
63.974
63.794
63.324
63.234
62.891
62.618
M65x4
4
6g
64.940
64.465
62.342
62.106
60.610
59.642
M65x4
4
4g6g
64.940
64.465
62.342
62.192
60.610
59.728
M65x3
3
6g
64.952
64.577
63.003
62.791
61.704
60.943
M65x3
3
4g6g
64.952
64.577
63.003
62.871
61.704
61.023
M65x2
2
6g
64.962
64.682
63.663
63.483
62.797
62.251
M65x2
2
4g6g
64.962
64.682
63.663
63.551
62.797
62.319
M65x1.5
1.5
6g
64.968
64.732
63.994
63.834
63.344
62.910
M65x1.5
1.5
4g6g
64.968
64.732
63.994
63.894
63.344
62.970
M68x6
6
6g
67.920
67.320
64.023
63.743
61.425
60.047
M68x6
6
4g6g
67.920
67.320
64.023
63.843
61.425
60.147
M68x4
4
6g
67.940
67.465
65.342
65.106
63.610
62.642
M68x4
4
4g6g
67.940
67.465
65.342
65.192
63.610
62.728
M68x3
3
6g
67.952
67.577
66.003
65.791
64.704
63.943
M68x3
3
4g6g
67.952
67.577
66.003
65.871
64.704
64.023
M68x2
2
6g
67.962
67.682
66.663
66.483
65.797
65.251
M68x2
2
4g6g
67.962
67.682
66.663
66.551
65.797
65.319
M68x1.5
1.5
6g
67.968
67.732
66.994
66.834
66.344
65.910
M68x1.5
1.5
4g6g
67.968
67.732
66.994
66.894
66.344
65.970
M68x1
1
6g
67.974
67.794
67.324
67.184
66.891
66.568
M68x1
1
4g6g
67.974
67.794
67.324
67.234
66.891
66.618
M70x6
6
6g
69.920
69.320
66.023
65.743
63.425
62.047
M70x6
6
4g6g
69.920
69.320
66.023
65.843
63.425
62.147
M70x4
4
6g
69.940
69.465
67.342
67.106
65.610
64.642
M70x4
4
4g6g
69.940
69.465
67.342
67.192
65.610
64.728
M70x3
3
6g
69.952
69.577
68.003
67.791
66.704
65.943
M70x3
3
4g6g
69.952
69.577
68.003
67.871
66.704
66.023
M70x2
2
6g
69.962
69.682
68.663
68.483
67.797
67.251
M70x2
2
4g6g
69.962
69.682
68.663
68.551
67.797
67.319
M70x1.5
1.5
6g
69.968
69.732
68.994
68.834
68.344
67.910
M70x1.5
1.5
4g6g
69.968
69.732
68.994
68.894
68.344
67.970
M72x6
6
6g
71.920
71.320
68.023
67.743
65.425
64.047
M72x6
6
4g6g
71.920
71.320
68.023
67.843
65.425
64.147
M72x4
4
6g
71.940
71.465
69.342
69.106
67.610
66.642
M72x4
4
4g6g
71.940
71.465
69.342
69.192
67.610
66.728
M72x3
3
6g
71.952
71.577
70.003
69.791
68.704
67.943
M72x3
3
4g6g
71.952
71.577
70.003
69.871
68.704
68.023
M72x2
2
6g
71.962
71.682
70.663
70.483
69.797
69.251
M72x2
2
4g6g
71.962
71.682
70.663
70.551
69.797
69.319
M72x1.5
1.5
6g
71.968
71.732
70.994
70.834
70.344
69.910
M72x1.5
1.5
4g6g
71.968
71.732
70.994
70.894
70.344
69.970
M72x1
1
6g
71.974
71.794
71.324
71.184
70.891
70.568
M72x1
1
4g6g
71.974
71.794
71.324
71.234
70.891
70.618
M75x6
6
6g
74.920
74.320
71.023
70.743
68.425
67.047
M75x6
6
4g6g
74.920
74.320
71.023
70.843
68.425
67.147
M75x4
4
6g
74.940
74.465
72.342
72.106
70.610
69.642
M75x4
4
4g6g
74.940
74.465
72.342
72.192
70.610
69.728
M75x3
3
6g
74.952
74.577
73.003
72.791
71.704
70.943
M75x3
3
4g6g
74.952
74.577
73.003
72.871
71.704
71.023
M75x2
2
6g
74.962
74.682
73.663
73.483
72.797
72.251
M75x2
2
4g6g
74.962
74.682
73.663
73.551
72.797
72.319
M75x1.5
1.5
6g
74.968
74.732
73.994
73.834
73.344
72.910
M75x1.5
1.5
4g6g
74.968
74.732
73.994
73.894
73.344
72.970
M76x6
6
6g
75.920
75.320
72.023
71.743
69.425
68.047
M76x6
6
4g6g
75.920
75.320
72.023
71.843
69.425
68.147
M76x4
4
6g
75.940
75.465
73.342
73.106
71.610
70.642
M76x4
4
4g6g
75.940
75.465
73.342
73.192
71.610
70.728
M76x3
3
6g
75.952
75.577
74.003
73.791
72.704
71.943
M76x3
3
4g6g
75.952
75.577
74.003
73.871
72.704
72.023
M76x2
2
6g
75.962
75.682
74.663
74.483
73.797
73.251
M76x2
2
4g6g
75.962
75.682
74.663
74.551
73.797
73.319
M76x1.5
1.5
6g
75.968
75.732
74.994
74.834
74.344
73.910
M76x1.5
1.5
4g6g
75.968
75.732
74.994
74.894
74.344
73.970
M76x1
1
6g
75.974
75.794
75.324
75.184
74.891
74.568
M76x1
1
4g6g
75.974
75.794
75.324
75.234
74.891
74.618
M78x2
2
6g
77.962
77.682
76.663
76.483
75.797
75.251
M78x2
2
4g6g
77.962
77.682
76.663
76.551
75.797
75.319

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