Page 383 - THREADING CATALOG

USER GUIDE
TAPS

American Unified Coarse Threads American Unified Fine Threads
Max. Core Max. Core
UNC T.P.I Dia. inch Drill Size mm UNF T.P.I Dia. inch Drill Size mm
#1 64 1.585 1.5 #0 80 1.306 1.3
#2 56 1.872 1.8 #1 72 1.613 1.6
#3 48 2.146 2.1 #2 64 1.913 1.9
#4 40 2.385 2.3 #3 56 2.197 2.1
#5 40 2.697 2.6 #4 48 2.459 2.4
#6 32 2.896 2.85 #5 44 2.741 2.7
#8 32 3.528 3.5 #6 40 3.012 3
#10 24 3.95 3.9 #8 36 3.597 3.5
#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
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
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
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
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
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
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
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
2" 4.5 45.367 45.25

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