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Standard Pitch diameters for Metric Thread Plug Gages
 METRICINCH (reference only)
NOMINAL SIZE6H GO 6H6H NOGO6H GO6H NOGO
M1.6 x 0.35
1.373
1.458
.05406
.05740
M1.8 x 0.35
1.573
1.658
.06193
.06528
M2 x 0.4
1.740
1.830
.06850
.07205
M2.2 x 0.45
1.908
2.003
.07512
.07886
M2.5 x 0.45
2.208
2.303
.08693
.09067
M3 x 0.5
2.675
2.775
.10531
.10925
M3.5 x 0.6
3.110
3.222
.12244
.12685
M4 x 0.7
3.545
3.663
.13957
.14421
M4.5 x 0.75
4.013
4.131
.15799
.16264
M5 x 0.8
4.480
4.6505
.17638
.18130
M5.5 x 0.75
5.013
5.131
.19736
.20201
M6 x 1.0
5.350
5.500
.21063
.21654
M6.3 x 1.0
5.650
5.800
.22244
.22835
M7 x 1.0
6.350
6.500
.25000
.25591
M8 x 1.25
7.188
7.348
.28299
.28929
M8 x 1.0
7.350
7.500
.28937
.29528
M9 x 1.25
8.188
8.348
.32236
.32866
M10 x .75
9.513
9.645
.37453
.37972
M10 x 1.5
9.026
9.206
.35535
.36244
M10 x 1.25
9.188
9.348
.36173
.36803
M11 x 1.5
10.026
10.206
029472
.40181
M12 x 1.0
11.350
11.510
.44685
.45315
M12 x 1.50
11.026
11.216
.43409
.44157
M12 x 1.75
10.863
11.063
.42768
.43555
M12 x 1.25
11.188
11.368
.44047
.44756
M14 x 2.0
12.701
12.913
.50004
.50838
M14 x 1.5
13.026
13.216
.51283
.52031
M15 x 1.5
14.026
14.216
.55220
.55968
M15 x 1.0
14.350
14.510
.56496
.57126
M16 x 2.0
14.701
14.913
.57878
.58712
M16 x 1.5
15.026
15.216
.59157
.59905
M17 x 1.0
16.350
16.510
.64370
.65000
M17 x 1.5
16.026
16.216
.63094
.63842
M18 x 2.5
16.376
16.600
.64472
.65354
M18 x 1.5
17.026
17.216
.67031
.67779
M20 x 1.0
19.350
19.510
.76181
.7681
M20 x 2.5
18.376
18.600
.72346
.73228
M20 x 1.5
19.026
19.216
.74905
.75653
M22 x 2.5
20.376
20.600
.80220
.81102
M22 x 1.5
21.026
21.216
.82779
.83527
M24 x 3.0
22.051
22.316
.86815
.87858
M24 x 2.0
22.701
22.925
.89374
.90256
M25 x 2.0
23.701
23.925
.93311
.94193
M25 x 1.5
24.026
24.226
.94590
.95378
M26 x 1.5
25.026
25.226
.98527
.99315
M26 x 1.0
25.350
25.520
.99803
1.00472
M27 x 3.0
25.051
25.316
.98626
.99669
M27 x 2.0
25.701
25.925
1.01185
1.02067
M28 x 2.0
26.701
26.925
1.05122
1.06004
M28 x 1.5
27.026
27.226
1.06401
1.07189
M28 x 1.0
27.350
27.520
1.07677
1.08346
M30 x 1.5
29.026
29.226
1.14276
1.15063
M30 x 3.5
27.727
28.007
1.09161
1.10264
M30 x 2.0
28.701
28.925
1.2996
1.13878
M32 x 2.0
30.701
30.925
1.20870
1.21752
M32 x 1.5
31.026
31.226
1.22149
1.22937
M33 x 3.5
30.727
31.007
1.20972
1.22075
M33 x 2.0
31.701
31.925
1.24807
1.25689
M35 x 1.5
34.026
34.226
1.33960
1.34748
M36 x 2.0
34.701
34.925
1.36618
1.37500
M36 x 4.0
33.402
33.702
1.31504
1.32685
M36 x 3.0
34.051
34.316
1.34059
1.35102
M38 x 1.5
37.026
37.226
1.45771
1.46559
M39 x 2.0
37.701
37.925
1.48429
1.49311

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