Page 373 - Carbide drills I Thread cutting tools 2023
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Core hole drill sizes
NPT 1:16 Conical reaming of the hole EG M
with a conical reamer 1:16
ø P(TPI) ø D max D min L min ø P Max. dimension Standard Critical material*
1/16 27 6.00 6.440 6.390 12.00 2.0 0.40 2.177 2.15 2.20 *
1/8 27 8.30 8.790 8.740 12.00 2.5 0.45 2.697 2.65 2.70 *
1/4 18 10.80 11.410 11.360 17.50 3.0 0.50 3.220 3.15 3.20
3/8 18 14.20 14.850 14.800 17.60 4.0 0.70 4.292 4.20 4.30 *
1/2 14 17.50 18.370 18.320 22.90 5.0 0.80 5.334 5.25 5.30
3/4 14 22.80 23.720 23.670 23.00 6.0 1.00 6.407 6.30 6.40
1 11.5 28.60 29.740 29.690 27.40 8.0 1.25 8.483 8.40 8.50 *
10.0 1.50 10.560 10.40 10.50
12.0 1.75 12.644 12.50 12.60
14.0 2.00 14.733 14.50 14.70
16.0 2.00 16.733 16.50 16.70
NPTF 1:16 Conical reaming of the hole EG MF
with a conical reamer 1:16
ø P(TPI) ø D max D min L min ø P Grösstmass Standard Critical material*
1/16 27 6.00 6.460 6.410 12.00 8.0 1.00 8.407 8.30 8.40
1/8 27 8.30 8.810 8.760 12.00 10.0 1.00 10.407 10.30 10.40
1/4 18 10.80 11.450 11.400 17.50 12.0 1.50 12.560 12.50 12.50
3/8 18 14.20 14.890 14.840 17.60 14.0 1.50 14.560 14.50 14.50
1/2 14 17.50 18.380 18.330 22.90 16.0 1.50 16.560 16.50 16.50
3/4 14 22.80 23.730 23.680 23.00
1 11.5 28.60 29.770 29.720 27.40
EG
NPSM
UNC
ø P Max. dimension Standard Critical material* ø P Max. dimension Standard Critical material*
1/8 27 9.246 9.10 9.20 4 40 3.178 3.10 3.20 *
1/4 18 12.217 12.00 12.20 6 32 3.879 3.80 3.90 *
3/8 18 15.545 15.50 15.50 8 32 4.523 4.40 4.50
1/2 14 19.279 19.00 19.20 10 24 5.283 5.20 5.30 *
3/4 14 24.638 24.50 24.60 1/4 20 6.872 6.70 6.90 *
5/16 18 8.490 8.40 8.50 *
3/8 16 10.126 10.00 10.10
1/2 13 13.393 13.30 13.40 *
EG
PG
UNF
i
ø P Max. dimension Standard Critical material* ø P Max. dimension Standard Critical material*
7 20 11.430 11.40 11.40 6 40 3.815 3.70 3.80
9 18 14.010 14.00 14.00 8 36 4.496 4.40 4.50 *
11 18 17.410 17.30 17.40 10 32 5.184 5.10 5.20 *
13.5 18 19.210 19.10 19.20 1/4 28 6.720 6.60 6.70
16 18 21.310 21.25 21.30 5/16 24 8.351 8.30 8.40 *
3/8 24 9.931 9.80 9.90
7/16 20 11.587 11.50 11.60 *
1/2 20 13.176 13.10 13.20 *
* The given dimension is out of norm
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