Whitworth Parallel Pipe Thread
DIN ISO 228 (DIN 259)
BSPP (British Standard Pipe Parallel)

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
TPI Pitch
mm
Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Minor Diamter
Nut
mm
Tapping
Drill Size
mm
TPI Pitch
mm
G 1/16" 0.304 7.722 6.843 6.561 28 0.907
G 1/8" 0.383 9.728 8.848 8.565 28 0.907
G 1/4" 0.518 13.157 11.890 11.445 19 1.337
G 3/8" 0.656 16.662 15.395 14.950 19 1.337
G 1/2" 0.825 20.955 19.172 18.633 14 1.814
G 5/8" 0.902 22.911 21.128 20.587 14 1.814
G 3/4" 1.041 26.441 24.658 24.120 14 1.814
G 7/8" 1.189 30.201 28.418 27.877 14 1.814
G 1" 1.309 33.249 30.931 30.292 11 2.309
G 1 1/8" 1.492 37.897 35.579 34.939 11 2.309
G 1 1/4" 1.650 41.910 39.592 38.953 11 2.309
G 1 3/8" 1.745 44.323 42.005 41.365 11 2.309
G 1 1/2" 1.882 47.803 45.485 44.846 11 2.309
G 1 5/8" 2.082 52.883 50.566 49.926 11 2.309
G 1 3/4" 2.116 53.746 51.428 50.788 11 2.309
G 1 7/8" 2.244 56.998 54.681 54.041 11 2.309
G 2" 2.347 59.614 57.296 56.657 11 2.309
G 2 1/4" 2.587 65.710 62.752 63.392 11 2.309
G 2 1/2" 2.960 75.184 73.391 72.227 11 2.309
G 2 3/4" 3.210 81.534 78.576 79.216 11 2.309
G 3" 3.460 87.884 86.289 84.927 11 2.309
G 3 1/2" 3.950 100.330 97.372 98.012 11 2.309
G 4" 4.450 113.030 111.733 110.073 11 2.309
G 4 1/2" 4.950 125.730 122.772 123.412 11 2.309
G 5" 5.450 138.430 137.332 135.473 11 2.309
G 5 1/2" 5.950 151.130 148.172 148.812 11 2.309
G 6" 6.450 163.830 162.732 160.873 11 2.309

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