British Standard Pipe Threads (BSPP, BSPF)
Dash Size |
Nominal Thread Size - t.p.i. | Basic depth of thread (h) (in.) | Basic Major Dia. (in.) | Basic effective Dia. (in.) | Basic Minor Dia. (in.) | Recommended tap drill size | |
| size Rp (mm) | Size G (mm) | ||||||
| -1 | 1/16-28 | .0229 | .304 | .2812 | .2583 | 6.60 | 6.80 |
-2 |
1/8-28 | .0229 | .383 | .3601 | .3372 | 8.60 | 8.80 |
| -4 | 1/4-19 | .0337 | .518 | .4843 | .4506 | 11.50 | 11.80 |
| -6 | 3/8-19 | .0337 | .656 | .6223 | .5886 | 15.00 | 15.25 |
| -8 | 1/2-14 | .0457 | .825 | .7793 | .7336 | 18.50 | 19.00 |
| -10 | 5/8-14 | .0457 | .902 | .8563 | .8106 | - | 21.00 |
| -12 | 3/4-14 | .0457 | 1.041 | .9953 | .9496 | 24.00 | 24.50 |
| -14 | 7/8-14 | .0457 | 1.189 | 1.1433 | 1.0976 | - | 23.25 |
| -16 | 1-11 | .0582 | 1.309 | 1.2508 | 1.1926 | 30.25 | 30.75 |
| -20 | 1 1/4-11 | .0582 | 1.650 | 1.5918 | 1.5336 | 39.00 | 39.50 |
| -24 | 1 1/2-11 | .0582 | 1.882 | 1.8238 | 1.7656 | 45.00 | 45.00 |
| -28 | 1 3/4-11 | .0582 | 2.116 | 2.0578 | 1.9996 | - | 51.00 |
| -32 | 2-11 | .0582 | 2.347 | 2.2888 | 2.2306 | 56.50 | 57.00 |
| -36 | 2 1/4-11 | .0582 | 2.587 | 2.5288 | 2.4706 | No Sizes of B.S. (British Standard) drills are recommended in B.S. 1157:1975 for this range | |
| -40 | 2 1/2-11 | .0582 | 2.960 | 2.9018 | 2.8436 | ||
| -44 | 2 3/4-11 | .0582 | 3.210 | 3.1518 | 3.0936 | ||
| -48 | 3-11 | .0582 | 3.460 | 3.4018 | 3.3436 | ||
| -52 | 3 1/4-11 | .0582 | 3.700 | 3.6418 | 3.5836 | ||
| -56 | 3 1/2-11 | .0582 | 3.950 | 3.8918 | 3.8336 | ||
| -60 | 3 3/4-11 | .0582 | 4.200 | 4.1418 | 4.0836 | ||
| -64 | 4-11 | .0582 | 4.450 | 4.3918 | 4.3336 | ||
 |
British Standard Pipe(BSPP, BSPF) Thread Form r = Basic Radius = * 137329 p h = Basic Depth of Thread = *640327 p p = Pitch = 1/t.p.i. (Threads per Inch) ISO 228, DIN 259, BS2779, JIS B0202 In Japan this thread is known as (PF) Use prefix G for parallel thread. Example: G1/2 |
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Ref. Catalog Page 42 (Chart 2)
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