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Phone: 203-753-5121
Fax: 203-755-9011
Toll-free: 800-992-3233

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Standard Pitch diameters for Metric Thread Ring & Set Plug Gages
 METRICINCH (reference only)
NOMINAL SIZE6g GO6g NOGO6g GO6g NOGO
M1.6 x 0.35
1.354
1.291
.05331
.05083
M1.8 x 0.35
1.554
1.491
.06118
.0570
M2 x 0.4
1.721
1.654
.06776
.06512
M2.2 x .045
1.888
1.817
.07433
.07154
M2.5 x 0.45
2.188
2.117
.08614
.08335
M3 x 0.5
2.655
2.580
.10453
.10157
M3.5 x 0.6
3.089
3.004
.12161
.11827
M4 x 0.7
3.523
3.433
.13870
.13516
M4.5 x 0.75
3.991
3.901
.15713
.15358
M5 x 0.8
4.456
4.361
.17543
.17169
M5.5 x 0.75
4.991
4.901
.19650
.19295
M6 x 1.0
5.324
5.212
.20961
.20520
M6.3 x 1.0
5.624
5.512
.22142
.21701
M7 x 1.0
6.324
6.212
.24898
.24457
M8 x 1.25
7.160
7.042
.28189
.27724
M8 x 1.0
7.324
7.212
.28835
.28394
M9 x 1.25
8.160
8.042
.32126
.31661
M10 x 0.75
9.491
9.391
.37366
.36972
M10 x 1.5
8.994
8.862
.35409
.34890
M10 x 1.25
9.160
9.042
.36063
.35598
M11 x 1.5
9.994
9.862
.39346
.38827
M12 x 1.0
11.324
11.206
.44583
.44118
M12 x 1.50
10.994
10.854
.43283
.42732
M12 x 1.75
10.829
10.679
.42634
.42043
M12 x 1.25
11.160
11.028
.43937
.43417
M14 x 2.0
12.663
12.503
.49854
.49224
M14 x 1.5
12.994
12.854
.51157
.50606
M15 x 1.5
13.994
13.854
.55094
.54543
M15 x 1.0
14.324
14.206
.56394
.55929
M16 x 2.0
14.663
14.503
.57728
.57098
M16 x 1.5
14.994
14.854
.59031
.58480
M17 x 1.0
16.324
16.206
.64268
.63803
M17 x 1.5
15.994
15.854
.62968
.62417
M18 x 2.5
16.334
16.164
.64307
.63638
M18 x 1.5
16.994
16.854
.66905
.66354
M20 x 1.0
19.324
19.206
.76079
.75614
M20 x 2.5
18.334
18.164
.72181
.71512
M20 x 1.5
18.994
18.854
.74779
.74228
M22 x 2.5
20.334
20.164
.80055
.79386
M22 x 1.5
20.994
20.854
.82653
.82102
M24 x 3.0
22.003
21.803
.86626
.85838
M24 x 2.0
22.663
22.493
.89224
.88555
M25 x 2.0
23.663
23.493
.93161
.92492
M25 x 1.5
23.994
23.844
.94464
.93874
M26 x 1.5
24.994
24.844
.98401
.97811
M26 x 1.0
25.324
25.212
.99701
.99260
M27 x 3.0
25.003
24.803
.98437
.97649
M27 x 2.0
25.663
25.493
1.01035
1.00366
M28 x 2.0
26.663
26.493
1.04972
1.04303
M28 x 1.5
26.994
26.844
1.07625
1.05684
M28 x 1.0
27.324
27.199
1.07575
1.07082
M30 x 1.5
28.994
28.844
1.14150
1.13559
M30 x 3.5
27.674
27.462
1.08953
1.08118
M30 x 2.0
28.663
28.493
1.12846
1.12177
M32 x 2.0
30.663
30.493
1.20720
1.20051
M32 x 1.5
30.994
30.844
1.22023
1.21432
M33 x 3.5
30.674
30.462
1.20764
1.19929
M33 x 2.0
31.663
31.493
1.24657
1.23988
M35 x 1.5
33.994
33.844
1.33834
1.33244
M36 x 2.0
34.663
34.493
1.36469
1.35799
M36 x 4.0
33.342
33.118
1.31267
1.30386
M36 x 3.0
34.003
33.803
1.33870
1.33082
M38 x 1.5
36.994
36.844
1.45645
1.45055
M39 x 2.0
37.663
37.493
1.48280
1.47610