Page 372 - Carbide drills I Thread cutting tools 2023

Core hole drill sizes

UNC UNF

ø P Max. dimension Standard Critical material* ø P Max. dimension Standard Critical material*
1 64 1.582 1.55 1.60 * 0 80 1.306 1.25 1.30
2 56 1.872 1.85 1.90 * 1 72 1.613 1.55 1.60
3 48 2.146 2.10 2.15 * 2 64 1.913 1.85 1.90
4 40 2.385 2.35 2.40 * 3 56 2.197 2.15 2.20 *
5 40 2.697 2.65 2.70 * 4 48 2.459 2.40 2.45
6 32 2.896 2.85 2.90 * 5 44 2.741 2.70 2.75 *
8 32 3.531 3.50 3.50 6 40 3.023 2.95 3.00
10 24 3.962 3.90 4.00 * 8 36 3.607 3.50 3.60
12 24 4.597 4.50 4.60 * 10 32 4.166 4.10 4.20 *
1/4 20 5.258 5.10 5.20 12 28 4.727 4.60 4.70
5/16 18 6.731 6.60 6.70 1/4 28 5.588 5.50 5.60 *
3/8 16 8.153 8.00 8.10 5/16 24 7.036 6.90 7.00
7/16 14 9.550 9.40 9.50 3/8 24 8.636 8.50 8.60
1/2 13 11.024 10.80 11.00 7/16 20 10.033 9.90 10.00
9/16 12 12.446 12.20 12.40 1/2 20 11.608 11.50 11.60
5/8 11 13.868 13.50 13.80 9/16 18 13.081 12.90 13.00
3/4 10 16.840 16.50 16.80 5/8 18 14.681 14.50 14.70 *
7/8 9 19.761 19.50 19.70 3/4 16 17.678 17.50 17.70 *
1 8 22.601 22.30 22.60 7/8 14 20.675 20.50 20.70 *
1 12 23.571 23.30 23.50

UNJC UNJF

ø P Max. dimension Standard Critical material* ø P Max. dimension Standard Critical material*
4 40 2.392 2.30 2.40 * 6 40 3.053 3.00 3.05
6 32 2.938 2.85 2.90 8 36 3.662 3.55 3.60
8 32 3.599 3.50 3.60 * 10 32 4.254 4.15 4.20
10 24 4.064 3.90 4.00 1/4 28 5.661 5.55 5.60
1/4 20 5.387 5.25 5.40 * 5/16 24 7.109 7.00 7.10
5/16 18 6.832 6.70 6.80 3/8 24 8.679 8.60 8.70 *
3/8 16 8.257 8.10 8.20

UNEF

ø P Max. dimension Standard Critical material*
1/4 32 5.689 5.60 5.70 *
5/16 32 7.264 7.20 7.30 *
3/8 32 8.864 8.80 8.90 *
7/16 28 10.337 10.20 10.30
1/2 28 11.938 11.80 11.90
9/16 24 13.385 13.20 13.40 *
5/8 24 14.986 14.80 15.00 *
11/16 24 16.560 16.40 16.50
3/4 20 17.957 17.80 18.00 *
7/8 20 21.132 21.00 21.10
* The given dimension is out of norm 1 20 24.307 24.20 24.30

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