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Dimensions For Thread Plug Gauge : 'G' Threads

BSP Thread Gauges.

Thread Plug Gauges For pipe threads, where pressure - tight joints are not made on the threads : 'G' Threads / BSP Threads.

 

Size Go Thread Plug Gauges Not Go Thread Plug Gauges
Major Ø

mm

 Tol.

± µm

 Pitch Ø

mm

 Tol.

± µm

 Minor Ø

max.

mm

 Major Ø

mm

 Tol.

± µm

 Pitch Ø

mm

 Tol.

± µm

 Minor Ø

max.

mm
G  1/16 ` 7.584 5 7.150 5 6.561 7.435 10 7.254 5 6.454
G  1/8 ` 9.589 5 9.155 5 8.566 9.440 10 9.259 5 8.459
G  1/4 13.162 10 12.309 5 11.445 12.698 10 12.431 5 11.320
G  3/8 16.667 10 15.814 5 14.950 16.203 10 15.936 5 14.825
G  1/2 20.961 12 19.806 6 18.631 20.304 12 19.941 6 18.489
G  5/8 22.917 12 21.762 6 20.587 22.260 12 21.897 6 20.445
G  3/4 26.447 12 25.292 6 24.117 25.790 12 25.427 6 23.975
G  7/8 30.207 12 29.052 6 27.877 29.550 12 29.187 6 27.735
G  1 33.255 12 31.783 6 30.291 32.418 12 31.956 6 30.111
G  1. 1/8 37.903 12 36.431 6 34.939 37.066 12 36.604 6 34.759
G  1. 1/4 41.916 12 40.444 6 38.952 41.079 12 40.617 6 38.772
G  1. 1/2 47.809 12 46.337 6 44.845 46.972 12 46.510 6 44.665
G  1. 3/4 53.752 12 52.280 6 50.788 52.915 12 52.453 6 50.608
G  2 59.620 12 58.148 6 56.656 58.783 12 58.321 6 56.476
G  2. 1/4 65.718 16 64.249 8 62.752 64.918 16 64.456 8 62.535
G  2. 1/2 75.192 16 73.723 8 72.226 74.392 16 73.930 8 72.009
G  2. 3/4 81.542 16 80.073 8 78.576 80.742 16 80.280 8 78.359
G  3 87.892 16 86.423 8 84.926 87.092 16 86.630 8 84.709
G  3. 1/2 100.338 16 98.869 8 97.372 99.538 16 99.076 8 97.155
G  4 113.038 16 111.569 8 110.072 112.238 16 111.776 8 109.855
G  4. 1/2 125.738 16 124.269 8 122.772 124.938 16 124.476 8 122.555
G  5 138.438 16 136.969 8 135.472 136.638 16 137.176 8 135.255
G  5. 1/2 151.138 16 149.669 8 148.172 150.338 16 149.876 8 147.955
G  6 163.838 16 162.369 8 160.872 163.038 16 162.576 8 160.655

` Truncated

Ref : 

Basic Dimensions :- ISO 228 ( I ) - 1982 ( E ).
Gauging Practice :- ISO 228 - 2 : 1987 ( E ).
Basic Dimensions :- IS 2643 Part I to III - 1975.
Gauging Practice :- IS 10216 - 1982.

 

Wear Allowance for Thread Plug Gauges.

Designation W go µm W ng µm
1/16 and 1/8 14 10
1/4 and 3/8 14 10
1/2 to 7/8 19 13
1 to 2 19 13
2.1/4 to 4 23 17
4.1/2 to 6 23 17

 

For dimensions of components for G threads ( BSP threads ) click here.

For any other details or questions on specification on thread plug or ring gauges, send your request here.

 

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