R-series Pipe Thread (british Standard Pipe Taper = Bspt) Pt-series ...
INDEX of THREAD DATA CHARTS
R-SERIES PIPE THREAD (BRITISH STANDARD PIPE TAPER = BSPT) PT-SERIES PIPE THREAD (JAPANESE PIPE TAPER)

| 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: [email protected]
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