Page 371 - Carbide drills I Thread cutting tools 2023

Core hole drill sizes

MJ Rc Rc 1:16 Conical reaming of the hole
with a conical reamer 1:16

ø P Max. dimension Standard Critical material* ø P(TPI) ø D max D min L min
2.0 0.40 1.722 1.65 1.70 1/16 28 6.10 6.605 6.515 11.90
2.5 0.45 2.187 2.10 2.20 * 1/8 28 8.10 8.615 8.525 11.90
3.0 0.50 2.653 2.60 2.65 1/4 19 10.80 11.505 11.395 17.70
4.0 0.70 3.498 3.40 3.50 * 3/8 19 14.30 15.005 14.895 18.10
5.0 0.80 4.421 4.30 4.40 1/2 14 17.80 18.695 18.565 24.00
6.0 1.00 5.216 5.10 5.20 3/4 14 23.00 24.185 24.055 25.30
8.0 1.00 7.216 7.10 7.20
10.0 1.25 8.994 8.90 9.00 *

G BSW

ø P Max. dimension Standard Critical material* ø P Max. dimension Standard Critical material*
1/8 28 8.848 8.80 8.85 * 1/8 40 2.591 2.50 2.60 *
1/4 19 11.890 11.80 11.90 * 3/16 24 3.745 3.60 3.70
3/8 19 15.395 15.25 15.40 * 1/4 20 5.156 5.10 5.10
1/2 14 19.172 19.00 19.20 * 5/16 18 6.588 6.50 6.60 *
5/8 14 21.128 21.00 21.10 3/8 16 7.988 7.90 8.00 *
3/4 14 24.658 24.50 24.60 7/16 14 9.332 9.20 9.30
1/2 12 10.589 10.50 10.60 *
5/8 11 13.558 13.50 13.50
3/4 10 16.484 16.20 16.50 *
7/8 9 19.355 19.20 19.30
1 8 22.1492 22.00 22.10

W
Rp zyl. Cylindrical drilling

ø P Max. dimension Standard Critical material* ø P Max. dimension Standard Critical material*
1/8 28 8.637 8.60 8.60 21.80 14 20.066 19.80 20.00
1/4 19 11.549 11.50 11.50 24.32 14 22.586 22.30 22.50
3/8 19 15.054 15.00 15.00
1/2 14 18.773 18.50 18.70
3/4 14 24.259 24.00 24.20

W
kon. W kon 3:25 Conical reaming of the hole
with a conical reamer 3:25

ø P(TPI) ø D max D min L min
19.80 14 14.60 16.880 16.760 23.50 i
28.80 14 22.60 25.480 25.360 28.50

* The given dimension is out of norm

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