Specifications of International Thread Standards

British Standard Pipe Parallel Thread, with sealant compound,(parallel, cylindrical), external = G.
The flank angle is 55°.

Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Minor Diamter
Nut
mm
Tapping
Drill Size
mm
TPIPitch
mm
G 1/16"0.0637.7226.8376.561280.907
G 1/8"0.1259.7288.8418.565280.907
G 1/4"0.25013.15711.86311.445191.337
G 3/8"0.37516.66215.38914.950191.337
G 1/2"0.50020.95519.20018.633141.814
G 3/4"0.75026.44124.77224.120141.814
G 1"1.00033.24931.01430.292112.309
G 1 1/4"1.25041.91039.81938.953112.309
G 1 1/2"1.50047.80345.71244.846112.309
G 2"2.00059.61457.72256.657112.309
G 2 1/2"2.50075.18473.39172.227112.309
G 3"3.00087.88486.28984.927112.309
G 4"4.000113.030111.733110.073112.309
G 5"5.000138.430137.332135.473112.309
G 6"6.000163.830162.732160.873112.309
Whitworth Pipe Thread