Internal Metric Thread Table Chart Fastener Sizes M 9 - M 24

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

The following table chart are standard metric internal thread sizes M 9 - M 24 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard internal threads. Do not use these values for standard metric external thread design. All units in mm.

ISO Metric
Thread
Designation
Pitch
Metric Internal Threads
Specification Table
Tolerance
Class
Minor Dia
Pitch Dia
Major Dia
Tap Drill
Min
Max
Min
Max
Min
Max
Basic
M9x1.25
1.25
6H
7.647
7.912
8.188
8.348
9.000
9.340
7.750
M9x1
1
6H
7.917
8.153
8.350
8.498
9.000
9.292
8.000
M9x0.75
0.75
6H
8.188
8.378
8.513
8.645
9.000
9.240
8.250
M9x0.5
0.5
6H
8.459
8.599
8.675
8.787
9.000
9.184
8.500
M10x1.5
1.5
6H
8.376
8.676
9.026
9.206
10.000
10.396
8.500
M10x1.25
1.25
6H
8.647
8.912
9.188
9.348
10.000
10.340
8.750
M10x1.12
1.12
6H
8.788
9.038
9.273
9.433
10.000
10.322
8.880
M10x1
1
6H
8.917
9.153
9.350
9.500
10.000
10.294
9.000
M10x0.75
0.75
6H
9.188
9.378
9.513
9.645
10.000
10.240
9.250
M10x0.5
0.5
6H
9.459
9.599
9.675
9.787
10.000
10.184
9.500
M11x1.5
1.5
6H
9.376
9.676
10.026
10.196
11.000
11.387
9.500
M11x1
1
6H
9.917
10.153
10.350
10.500
11.000
11.294
10.000
M11x0.75
0.75
6H
10.188
10.378
10.513
10.645
11.000
11.240
10.250
M11x0.5
0.5
6H
10.459
10.599
10.675
10.787
11.000
11.184
10.500
M12x1.75
1.75
6H
10.106
10.441
10.863
11.063
12.000
12.453
10.250
M12x1.5
1.5
6H
10.376
10.676
11.026
11.216
12.000
12.406
10.500
M12x1.25
1.25
6H
10.647
10.912
11.188
11.368
12.000
12.360
10.750
M12x1
1
6H
10.917
11.153
11.350
11.510
12.000
12.304
11.000
M12x0.75
0.75
6H
11.188
11.378
11.513
11.653
12.000
12.248
11.250
M12x0.5
0.5
6H
11.459
11.599
11.675
11.795
12.000
12.192
11.500
M14x2
2
6H
11.835
12.210
12.701
12.913
14.000
14.501
12.000
M14x1.5
1.5
6H
12.376
12.676
13.026
13.216
14.000
14.406
12.500
M14x1.25
1.25
6H
12.647
12.912
13.188
13.358
14.000
14.350
12.750
M14x1
1
6H
12.917
13.153
13.350
13.510
14.000
14.304
13.000
M14x0.75
0.75
6H
13.188
13.378
13.513
13.653
14.000
14.248
13.250
M14x0.5
0.5
6H
13.459
13.599
13.675
13.795
14.000
14.192
13.500
M15x1.5
1.5
6H
13.376
13.676
14.026
14.216
15.000
15.407
13.500
M15x1
1
6H
13.917
14.153
14.350
14.510
15.000
15.304
14.000
M16x2
2
6H
13.835
14.210
14.701
14.913
16.000
16.501
14.000
M16x1.6
1.6
6H
14.268
14.568
14.961
15.101
16.000
16.371
14.400
M16x1.5
1.5
6H
14.376
14.676
15.026
15.216
16.000
16.406
14.500
M16x1.25
1.25
6H
14.647
14.912
15.188
15.358
16.000
16.350
14.750
M16x1
1
6H
14.917
15.153
15.350
15.510
16.000
16.304
15.000
M16x0.75
0.75
6H
15.188
15.378
15.513
15.653
16.000
16.248
15.250
M16x0.5
0.5
6H
15.459
15.599
15.675
15.795
16.000
16.192
15.500
M17x1.5
1.5
6H
15.376
15.676
16.026
16.216
17.000
17.407
15.500
M17x1
1
6H
15.917
16.153
16.350
16.510
17.000
17.304
16.000
M18x2.5
2.5
6H
15.294
15.744
16.376
16.601
18.000
18.585
15.500
M18x2
2
6H
15.835
16.210
16.701
16.913
18.000
18.501
16.000
M18x1.5
1.5
6H
16.376
16.676
17.026
17.216
18.000
18.406
16.500
M18x1.25
1.25
6H
16.647
16.912
17.188
17.358
18.000
18.350
16.750
M18x1
1
6H
16.917
17.153
17.350
17.510
18.000
18.304
17.000
M18x0.75
0.75
6H
17.188
17.378
17.513
17.653
18.000
18.248
17.250
M18x0.5
0.5
6H
17.459
17.599
17.675
17.795
18.000
18.192
17.500
M20x2.5
2.5
6H
17.294
17.744
18.376
18.600
20.000
20.585
17.500
M20x2
2
6H
17.835
18.210
18.701
18.913
20.000
20.501
18.000
M20x1.5
1.5
6H
18.376
18.676
19.026
19.216
20.000
20.406
18.500
M20x1
1
6H
18.917
19.153
19.350
19.510
20.000
20.304
19.000
M20x0.75
0.75
6H
19.188
19.378
19.513
19.653
20.000
20.248
19.250
M20x0.5
0.5
6H
19.459
19.599
19.675
19.795
20.000
20.192
19.500
M22x3
3
6H
18.752
19.252
20.051
20.296
22.000
22.677
19.000
M22x2.5
2.5
6H
19.294
19.744
20.376
20.600
22.000
22.585
19.500
M22x2
2
6H
19.835
20.210
20.701
20.913
22.000
22.501
20.000
M22x1.5
1.5
6H
20.376
20.676
21.026
21.216
22.000
22.406
20.500
M22x1
1
6H
20.917
21.153
21.350
21.510
22.000
22.304
21.000
M22x0.75
0.75
6H
21.188
21.378
21.513
21.653
22.000
22.248
21.250
M22x0.5
0.5
6H
21.459
21.599
21.675
21.795
22.000
22.192
21.500
M24x3
3
6H
20.752
21.252
22.051
22.316
24.000
24.698
21.000
M24x2.5
2.5
6H
21.294
21.744
22.376
22.626
24.000
24.611
21.500
M24x2
2
6H
21.835
22.210
22.701
22.925
24.000
24.513
22.000
M24x1.5
1.5
6H
22.376
22.676
23.026
23.226
24.000
24.417
22.500
M24x1
1
6H
22.917
23.153
23.350
23.520
24.000
24.314
23.000
M24x0.75
0.75
6H
23.188
23.378
23.513
23.663
24.000
24.258
23.250

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