Page 55 - HOLE MAKING CATALOG p311-382
P. 55
USER GUIDE TAPS
Pre-Tapping Hole Sizes - Forming Taps Pre-Tapping Hole Sizes - General Taps
Recommended Recommended American Unified American Unified
Tap Drill Size Tap Drill Size Coarse Threads Fine Threads
M Pitch Drill MF Pitch Drill UNC T.P.I Max. Drill UNF T.P.I Max. Drill
mm Size mm Size Core Size Core Size
mm mm Dia. mm Dia. mm
inch inch
1 0.25 0.9 2.5 0.35 2.37
1.1 0.25 1 2.6 0.35 2.47 #1 64 1.585 1.5 #0 80 1.306 1.3
#2 56 1.872 1.8 #1 72 1.613 1.6
1.2 0.25 1.1 3 0.35 2.88 #3 48 2.146 2.1 #2 64 1.913 1.9
#4 40 2.385 2.3 #3 56 2.197 2.1
1.4 0.3 1.28 3.5 0.35 3.38 #5 40 2.697 2.6 #4 48 2.459 2.4
#6 32 2.896 2.85 #5 44 2.741 2.7
1.6 0.35 1.47 4 0.5 3.8 #8 32 3.528 3.5 #6 40 3.012 3
#10 24 3.95 3.9 #8 36 3.597 3.5
1.7 0.35 1.57 5 0.5 4.8 #12 24 4.59 4.5 #10 32 4.168 4.1
1/4" 20 5.25 5.2 #12 28 4.717 4.7
1.8 0.35 1.67 6 0.5 5.8 5/16" 18 6.68 6.6 1/4" 28 5.563 5.5
3/8" 16 8.082 8 5/16" 24 6.995 6.9
2 0.4 1.85 6 0.75 5.7 7/16" 14 9.441 9.4 3/8" 24 8.565 8.5
1/2" 13 10.881 10.75 7/16" 20 9.947 9.9
2.2 0.45 2.03 7 0.75 6.7 9/16" 12 12.301 12.25 1/2" 20 11.524 11.5
5/8" 11 13.693 13.5 9/16" 18 12.969 12.9
2.3 0.4 2.15 8 0.75 7.7 3/4" 10 16.624 16.5 5/8" 18 14.554 14.5
7/8" 9 19.52 19.5 3/4" 16 17.546 17.5
2.5 0.45 2.33 8 1 7.6 1" 8 22.344 22.25 7/8" 14 20.493 20.5
1*1/8" 7 25.082 25 1" 12 23.363 23.25
2.6 0.45 2.43 9 0.75 8.7 1*1/4" 7 28.258 28.25 1*1/8" 12 26.538 26.5
1*3/8" 6 30.851 30.75 1*1/4" 12 29.713 29.5
3 0.5 2.8 9 1 8.6 1*1/2" 6 34.026 34 1*3/8" 12 32.888 32.7
1*3/4" 5 39.56 39.5 1*1/2" 12 36.063 36
3.5 0.6 3.25 10 0.75 9.7 2" 4.5 45.367 45.25
4 0.7 3.7 10 1 9.6
4.5 0.75 4.2 10 1.25 9.45
5 0.8 4.65 11 1 10.6
6 1 5.55 12 1 11.6
7 1 6.55 12 1.25 11.45
8 1.25 6.6 12 1.5 11.35
9 1.25 7.45 14 1 13.6
10 1.5 8.45 14 1.25 13.45
11 1.5 9.35 14 1.5 13.35
12 1.75 11.25 15 1 14.6
14 2 13.1 15 1.5 14.35
16 2 15.1 16 1 15.6
18 2.5 16.85 16 1.5 15.35
20 2.5 18.85 18 4 17.6
22 2.5 20.85 18 1.5 17.35
24 3 22.65 18 2 17.1
27 3 25.65 20 1 19.6
30 3.5 28.4 20 1.5 19.35
33 3.5 31.4 20 2 19.1
36 4 34.15 24 2 23.1
39 4 37.15 30 2 29.1
42 4.5 39.9 36 3 34.65
45 4.5 42.9 42 4 40.15
48 5 45.65 48 3 46.65
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