fraisa.com 348 UNC UNF UNJC UNJF UNEF Core hole drill sizes ø P Max. dimension Standard Critical material* 1 64 1.582 1.55 1.60 * 2 56 1.872 1.85 1.90 * 3 48 2.146 2.10 2.15 * 4 40 2.385 2.35 2.40 * 5 40 2.697 2.65 2.70 * 6 32 2.896 2.85 2.90 * 8 32 3.531 3.50 3.50 10 24 3.962 3.90 4.00 * 12 24 4.597 4.50 4.60 * 1/4 20 5.258 5.10 5.20 5/16 18 6.731 6.60 6.70 3/8 16 8.153 8.00 8.10 7/16 14 9.550 9.40 9.50 1/2 13 11.024 10.80 11.00 9/16 12 12.446 12.20 12.40 5/8 11 13.868 13.50 13.80 3/4 10 16.840 16.50 16.80 7/8 9 19.761 19.50 19.70 1 8 22.601 22.30 22.60 ø P Max. dimension Standard Critical material* 0 80 1.306 1.25 1.30 1 72 1.613 1.55 1.60 2 64 1.913 1.85 1.90 3 56 2.197 2.15 2.20 * 4 48 2.459 2.40 2.45 5 44 2.741 2.70 2.75 * 6 40 3.023 2.95 3.00 8 36 3.607 3.50 3.60 10 32 4.166 4.10 4.20 * 12 28 4.727 4.60 4.70 1/4 28 5.588 5.50 5.60 * 5/16 24 7.036 6.90 7.00 3/8 24 8.636 8.50 8.60 7/16 20 10.033 9.90 10.00 1/2 20 11.608 11.50 11.60 9/16 18 13.081 12.90 13.00 5/8 18 14.681 14.50 14.70 * 3/4 16 17.678 17.50 17.70 * 7/8 14 20.675 20.50 20.70 * 1 12 23.571 23.30 23.50 ø P Max. dimension Standard Critical material* 4 40 2.392 2.30 2.40 * 6 32 2.938 2.85 2.90 8 32 3.599 3.50 3.60 * 10 24 4.064 3.90 4.00 1/4 20 5.387 5.25 5.40 * 5/16 18 6.832 6.70 6.80 3/8 16 8.257 8.10 8.20 ø P Max. dimension Standard Critical material* 6 40 3.053 3.00 3.05 8 36 3.662 3.55 3.60 10 32 4.254 4.15 4.20 1/4 28 5.661 5.55 5.60 5/16 24 7.109 7.00 7.10 3/8 24 8.679 8.60 8.70 * 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 1 20 24.307 24.20 24.30 * The given dimension is out of norm
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