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

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 design. All units in mm.

Standard External Metric Thread and Fastener Sizes M20 - M55

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
Designation
Class
Max
Min
Max
Min
Max. Min.
M1.6 × 0.35
6g
1.581
1.496
1.354
1.291
1.202 1.075
M1.6 × 0.35
4g6g
1.581
1.496
1.354
1.314
1.202 1.098
M2 × 0.4
6g
1.981
1.886
1.721
1.654
1.548 1.408
M2 × 0.4
4g6g
1.981
1.886
1.721
1.679
1.548 1.433
M2.5 × 0.45
6g
2.480
2.380
2.188
2.117
1.993 1.840
M2.5 × 0.45
4g6g
2.480
2.380
2.188
2.143
1.993 1.866
M3 × 0.5
6g
2.980
2.874
2.655
2.580
2.439 2.272
M3 × 0.5
4g6g
2.980
2.874
2.655
2.607
2.439 2.299
M3.5 × 0.6
6g
3.479
3.354
3.089
3.004
2.829 2.635
M3.5 × 0.6
4g6g
3.479
3.354
3.089
3.036
2.829 2.667
M4 × 0.7
6g
3.978
3.838
3.523
3.433
3.220 3.002
M4 × 0.7
4g6g
3.978
3.838
3.523
3.467
3.220 3.036
M5 × 0.8
6g
4.976
4.826
4.456
4.361
4.110 3.869
M5 × 0.8
4g6g
4.976
4.826
4.456
4.396
4.110 3.904
M6 × 1
6g
5.974
5.794
5.324
5.212
4.891 4.596
M6 × 1
4g6g
5.974
5.794
5.324
5.253
4.891 4.637
M8 × 1.25
6g
7.972
7.760
7.160
7.042
6.619 6.272
M8 × 1.25
4g6g
7.972
7.760
7.160
7.085
6.619 6.315
M8 × 1
6g
7.974
7.794
7.324
7.212
6.891 6.596
M8 × 1
4g6g
7.974
7.794
7.324
7.253
6.891 6.637
M10 × 1.5
6g
9.968
9.732
8.994
8.862
8.344 7.938
M10 × 1.5
4g6g
9.968
9.732
8.994
8.909
8.344 7.985
M10 × 1.25
6g
9.972
9.760
9.160
9.042
8.619 8.272
M10 × 1.25
4g6g
9.972
9.760
9.160
9.085
8.619 8.315
M10 × 0.75
6g
9.978
9.838
9.491
9.391
9.166 8.929
M10 × 0.75
4g6g
9.978
9.838
9.491
9.428
9.166 8.966
M12 × 1.75
6g
11.966
11.701
10.829
10.679
10.072 9.601
M12 × 1.75
4g6g
11.966
11.701
10.829
10.734
10.072 9.656
M12 × 1.5
6g
11.968
11.732
10.994
10.854
10.344 9.930
M12 × 1.25
6g
11.972
11.760
11.160
11.028
10.619 10.258
M12 × 1.25
4g6g
11.972
11.760
11.160
11.075
10.619 10.305
M12 × 1
6g
11.974
11.794
11.324
11.206
10.891 10.590
M12 × 1
4g6g
11.974
11.794
11.324
11.249
10.891 10.633
M14 × 2
6g
13.962
13.682
12.663
12.503
11.797 11.271
M14 × 2
4g6g
13.962
13.682
12.663
12.563
11.797 11.331
M14 × 1.5
6g
13.968
13.732
12.994
12.854
12.344 11.930
M14 × 1.5
4g6g
13.968
13.732
12.994
12.904
12.344 11.980
M15 × 1
6g
14.974
14.794
14.324
14.206
13.891 13.590
M15 × 1
4g6g
14.974
14.794
14.324
14.249
13.891 13.633
M16 × 2
6g
15.962
15.682
14.663
14.503
13.797 13.271
M16 × 2
4g6g
15.962
15.682
14.663
14.563
13.797 13.331
M16 × 1.5
6g
15.968
15.732
14.994
14.854
14.344 13.930
M16 × 1.5
4g6g
15.968
15.732
14.994
14.904
14.344 13.980
M17 × 1
6g
16.974
16.794
16.324
16.206
15.891 15.590
M17 × 1
4g6g
16.974
16.794
16.324
16.249
15.891 15.633
M18 × 1.5
6g
17.968
17.732
16.994
16.854
16.344 15.930
M18 × 1.5
4g6g
17.968
17.732
16.994
16.904
16.344 15.980

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