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.) | Tap Drill Size Rp (mm) | Tap Drill 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 | ||
-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 |
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