Technical Information

THREAD DATA CHARTS

PIPE THREAD -- BRITISH STANDARD PIPE PARALLEL -- BSPP/BSPF
PIPE THREAD -- JAPANESE PIPE PARALLEL -- PF

Pipe Thread BSP (JIS PF)

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British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF)
Thread
Designation

BSPP/BSPF		 Nominal
Size

BSPP/BSPF		 Thread
Form
Type		 Major
Diameter
mm
d=D		 Pitch
mm
p		 Threads
per
inch
tpi		 Pitch
Diameter
mm
d2=D2		 Minor
Diameter
Male Thd.
d3		 Thread
Height
H1		 Tap
Drill
Diameter
mm		  
G 1/8 1/8" BSPP/BSPF 9.728 0.907 28 9.147 8.566 0.581 8.7
G 1/4 1/4" BSPP/BSPF 13.157 1.337 19 12.301 11.445 0.856 11.6
G 3/8 3/8" BSPP/BSPF 16.662 1.337 19 15.806 14.95 0.856 15
G 1/2 1/2" BSPP/BSPF 20.955 1.814 14 19.793 18.631 1.162 19
G 5/8 5/8" BSPP/BSPF 22.911 1.814 14 21.749 20.587 1.162 20.75
G 3/4 3/4" BSPP/BSPF 26.441 1.814 14 25.279 24.117 1.162 24.5
G 7/8 7/8" BSPP/BSPF 30.201 1.814 14 29.039 27.877 1.162 28
G 1 1" BSPP/BSPF 33.249 2.309 11 31.77 30.291 1.479 30.5
G 1 1/8 1 1/8" BSPP/BSPF 37.897 2.309 11 36.418 34.939 1.479 35
G 1 1/4 1 1/4" BSPP/BSPF 41.91 2.309 11 40.431 38.952 1.479 39.5
G 1 3/8 1 3/8" BSPP/BSPF 44.323 2.309 11 42.844 41.365 1.479 41.5
G 1 1/2 1 1/2" BSPP/BSPF 47.803 2.309 11 46.324 44.845 1.479 45
G 1 3/4 1 3/4" BSPP/BSPF 53.746 2.309 11 52.267 50.788 1.479 51
G 2 2" BSPP/BSPF 59.614 2.309 11 58.135 56.656 1.479 57
G 2 1/4 2 1/4" BSPP/BSPF 65.71 2.309 11 64.231 62.752 1.479 63
G 2 1/2 2 1/2" BSPP/BSPF 75.184 2.309 11 73.705 72.226 1.479 72.5
G 2 3/4 2 3/4" BSPP/BSPF 81.534 2.309 11 80.055 78.576 1.479 79
G 3 3" BSPP/BSPF 87.884 2.309 11 86.405 84.926 1.479 85.5
G 3 1/4 3 1/4" BSPP/BSPF 93.98 2.309 11 92.501 91.022 1.479 91
G 3 1/2 3 1/2" BSPP/BSPF 100.33 2.309 11 98.351 97.372 1.479 97.75
G 3 3/4 3 3/4" BSPP/BSPF 106.68 2.309 11 105.201 103.722 1.479 104
G 4 4" BSPP/BSPF 113.03 2.309 11 111.55 110.072 1.479 110.5
G 4 1/2 4 1/2" BSPP/BSPF 125.73 2.309 11 124.251 122.772 1.479 123
G 5 5" BSPP/BSPF 138.43 2.309 11 136.951 135.472 1.479 136
G 5 1/2 5 1/2" BSPP/BSPF 151.13 2.309 11 149.651 148.172 1.479 148.5
G 6 6" BSPP/BSPF 163.83 2.309 11 162.351 160.872 1.479 161.5

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PIPE THREAD -- BRITISH STANDARD PIPE TAPER -- BSPT
PIPE THREAD -- JAPANESE PIPE TAPER -- PT
Pipe Thread BSP (JIS PF)

British Pipe Thread ( Whitworth Form) -- Taper (BSPT)
Thread
Designation

BSPT		 Nominal
Size

BSPT		 Thread
Form
Type		 Major
Diameter
mm
d=D		 Pitch
mm
p		 Threads
per
inch
tpi		 Pitch
Diameter
mm
d2=D2		 Minor
Diameter
Male Thd.
d3		 Thread
Height
H1		 Rounding
r		 Tap
Drill
Diameter
mm		  
R 1/16 1/16" BSPT 7.723 0.907 28 7.142 6.561 0.581 0.125 6.4
R 1/8 1/8" BSPT 9.728 0.907 28 9.147 8.566 0.581 0.125 8.4
R 1/4 1/4" BSPT 13.157 1.337 19 12.301 11.445 0.856 0.184 11.2
R 3/8 3/8" BSPT 16.662 1.337 19 15.806 14.950 0.856 0.184 14.75
R 1/2 1/2" BSPT 20.955 1.814 14 19.793 18.631 1.162 0.249 18.25
R 3/4 3/4" BSPT 26.441 1.814 14 25.279 24.117 1.162 0.249 23.75
R 1 1" BSPT 33.249 2.309 11 31.77 30.291 1.479 0.317 30
R 1 1/4 1 1/4" BSPT 41.910 2.309 11 40.431 38.952 1.479 0.317 38.5
R 1 1/2 1 1/2" BSPT 47.803 2.309 11 46.324 44.845 1.479 0.317 44.5
R 2 2" BSPT 59.614 2.309 11 58.135 56.656 1.479 0.317 56
R 2 1/2 2 1/2" BSPT 75.184 2.309 11 73.705 72.226 1.479 0.317 71
R 3 3" BSPT 87.884 2.309 11 86.405 84.926 1.479 0.317 85.5
R 4 4" BSPT 113.030 2.309 11 111.551 110.072 1.479 0.317 110.5
R 5 5" BSPT 138.430 2.309 11 136.951 135.472 1.479 0.317 136
R 6 6" BSPT 163.830 2.309 11 162.351 160.872 1.479 0.317 161.5

 
 

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