Thread Size Over
all
lgth
A		 Thread
lgth
B		 Sq
lgth
C		 Shank
Dia.
D		 # OF FLUTES   H Limits
Sq
Size		 Str.
Flute		 S/P
Plug		 S/F
Bott		 Tap
Style
3B 2B
Unified
Coarse
1 (.073)-64 1-13/16 1/2 3/16 .141 .110 3 2 2 1 H1 H2
2 (.086)-56 1-7/8 9/16 3/16 .141 .110 3 2 2 1 H1 H2
3 (.099)-48 1-15/16 5/8 3/16 .141 .110 3 2 2 1 H1 H2
4 (.112)-40 2 11/16 3/16 .141 .110 3 2 2 1 H1 H2
5 (.125)-40 2-1/8 3/4 1/4 .168 .131 3 2 3 1 H1 H2
6 (.138)-32 2-3/8 7/8 1/4 .194 .152 3 2 3 1 H2 H3
8 (.164)-32 2-3/8 15/16 9/32 .220 .165 3 2 3 1 H2 H3
10 (.190)-24 2-1/2 1 5/16 .255 .191 3 2 3 2 H2 H3
12 (.216)-24 2-23/32 1-1/8 3/8 .318 .238 3 2 3 2 H2 H3
1/4
(.2500)-20		 2-23/32 1-1/8 3/8 .318 .238 3 2 3 2 H2 H3
5/16
(.3125)-18		 2-15/16 1-1/4 7/16 .381 .286 4 3 3 2 H3 H4
3/8
(.3750)-16		 3-3/8 1-21/32 7/16 .367 .275 4 3 3 3 H3 H4
7/16
(.4375)-14		 3-19/32 1-21/32 1/2 .429 .322 4 3 4 3 H3 H4
1/2
(.5000)-13		 3-13/16 1-13/16 9/16 .480 .360 4 3 4 3 H3 H4
9/16
(.5625)-12		 4-1/32 1-13/16 5/8 .542 .406 4 3 H3 H4
5/8
(.6250)-11		 4-1/4 2 11/16 .590 .442 4 3 H3 H4
3/4
(.7500)-10		 4-11/16 2-7/32 3/4 .697 .523 4 3 H3 H5
7/8 (.8750)-9 5-1/18 2-1/2 13/16 .800 .600 4 3 H3 H5
1 (1.000)-8 5-3/4 2-9/16 1 1.021 .766 4 3 H4 H6
1-1/8
(1.1250)-7		 6-1/16 3 1-1/16 1.108 .831 4 3 H4 H6
1-1/4
(1.2500)-7		 6-3/8 3 1-1/8 1.233 .925 4 3 H4 H6
1-3/8
(1.3750)-6		 6-11/16 3-3/16 1-1/8 1.305 .979 6 3 H6 H8
1-1/2
(1.5000)-6		 7 3-3/16 1-1/4 1.430 1.072 6 3 H6 H8
UNIFIED FINE
2 (.086)-64 1-7/8 9/16 3/16 .141 .110 3 2 2 1 H1 H2
3 (.099)-56 1-15/16 5/8 3/16 .141 .110 3 2 2 1 H1 H2
4 (.112)-48 2 11/16 3/16 .141 .110 3 2 2 1 H1 H2
6 (.138)-40 2-1/8 3/4 1/4 .168 .131 3 2 3 1 H1 H2
8 (.164)-36 2-3/8 15/16 9/32 .220 .165 3 2 3 1 H1 H2
10 (.190)-32 2-1/2 1 5/16 .255 .191 3 2 3 2 H2 H3
1/4
(.2500)-28		 2-23/32 1-1/8 3/8 .318 .238 3 2 3 2 H2 H3
5/16
(.3125)-24		 2-15/16 1-1/4 7/16 .381 .286 4 3 3 2 H2 H3
3/8
(.3750)-24		 3-5/32 1-7/16 13/32 .323 .242 4 3 3 3 H2 H3
7/16
(.4375)-20		 3-3/8 1-21/32 7/16 .367 .275 4 3 3 3 H3 H4
1/2
(.5000)-20		 3-19/32 1-21/32 1/2 .429 .322 4 3 4 3 H3 H4
9/16
(.5625)-18		 3-13/16 1-13/16 9/16 .480 .360 4 3 H3 H4
5/8
(.6250)-18		 4-1/32 1-13/16 5/8 .542 .406 4 3 H3 H4
3/4
(.7500)-16		 4-15/32 2 11/16 .652 .489 4 3 H3 H4
7/8
(.8750)-14		 5-1/8 2-1/2 13/16 .800 .600 4 3 H3 H4
1 (1.0000)-14 5-7/16 2-9/16 7/8 .896 .672 4 3 H4 H6
1 (1.0000)-12 5-7/16 2-9/16 7/8 .896 .672 4 3 H4 H6
1-1/8
(1.1250)-12		 5-3/4 2-9/16 1 1.021 .766 6 3 H4 H6
1-1/4
(1.2500)-12		 6-1/16 3 1-1/16 1.108 .831 6 3 H4 H6
1-3/8
(1.3750)-12		 6-3/8 3 1-1/8 1.233 .925 6 3 H4 H6
1-1/2
(1.5000)-12		 6-11/16 3-3/16 1-1/8 1.305 .979 6 3 H4 H6