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Technical Information

INDEX of THREAD DATA CHARTS

R-SERIES PIPE THREAD (BRITISH STANDARD PIPE TAPER = BSPT)
PT-SERIES PIPE THREAD (JAPANESE PIPE TAPER)


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

Disclaimer
This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. If accuracy is critical, base your final decisions on the data provided in the root document: ISO 7; which is a copyrighted document. To purchase a copy visit an Authorized Reseller.

Comments:
Original Posting: 2/28/2008
Last Revision: 2/13/2013
Error corrections in, or comments about, the above data can be sent to: gageguy@gagecrib.com

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6701 Old 28th St SE, Suite B
Grand Rapids, MI 49546-6937
Phone: 001-616-954-6581 • Fax: 001-616-954-6583
Email: gageguy@gagecrib.com

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