Table 6. Optional Neck and Optional Shortened Thread Length (Tap Dimensions, Ground and Cut Thread) ANSI/ASME B94.9-2008 (R2018) Nominal Diameter, inch Nominal Diameter, inch Nominal Metric Diameter Tap Dimensions, inch
Size of Square a 0.110 0.110 0.110 0.131 0.152
Machine Screw Size No. and Fractional Sizes
Square Length I 2
Shank Diameter d 1
Overall Length L
Thread Length I
To (inclusive)
Decimal Equiv. (0.1120) (0.1250) (0.1380) (0.1640) (0.1900) (0.2160) (0.2500) (0.3125) (0.3750) (0.4375) (0.5000) (0.5625) … (0.6250) (0.6875) (0.7500) (0.8125) (0.8750) (0.9375) (1.0000)
Blank Design No.
Neck Length I 1
Over 0.104 0.117 0.130 0.145 0.171 0.197 0.223 0.260 0.323 0.395 0.448 0.510 0.573 0.635 0.709 0.760 0.823 0.885 0.948
mm
inch
0.117 0.130 0.145 0.171 0.197 0.223 0.260 0.323 0.395 0.448 0.510 0.573 0.635 0.709 0.760 0.823 0.885 0.948 1.010
4 5 6 8
1 1 1 1 1 1 2 2 2 3 3 3 3 3 3 3 3 3 3
1.88 1.94 2.00 2.13 2.38 2.38 2.50 2.72 2.94 3.16 3.38 3.59 3.81 4.03 4.25 4.47 4.69 4.91 5.13
0.31 0.31 0.38 0.38 0.50 0.50 0.63 0.69 0.75 0.88 0.94 1.00 1.09 1.09 1.22 1.22 1.34 1.34 1.50
0.25 0.31 0.31 0.38 0.38 0.44 0.38 0.44 0.50 0.50
0.19 0.19 0.19 0.25 0.25 0.28 0.31 0.38 0.44 0.41 0.44 0.50 0.56 0.63 0.69 0.69 0.75 0.75 0.75
0.141 0.141 0.141 0.168 0.194 0.220 0.255 0.318 0.381 0.323 0.367 0.429 0.480 0.542 0.590 0.652 0.697 0.760 0.800
M3.0 M3.5 M4.0 M4.5 M5.0
0.1181 0.1378 0.1575 0.1772 0.1969 0.2362 0.2756 0.3150 0.3937 0.4724 0.5512 0.6299 0.7087 0.7874 0.8661 0.9449 0.9843
10 … 12
… …
… … … … … … …
… …
0.165 0.191 0.238 0.286 0.242 0.275 0.322 0.360 0.406 0.442 0.489 0.523 0.570 0.600
M6.0 M7.0 M8.0 M10.0 M12.0 M14.0 M16.0 M18.0 M20.0 M22.0 M24.0 M25.0
1 ⁄ 4
5 ⁄ 16
… …
…
… … … … … … …
3 ⁄ 8
… …
7 ⁄ 16
… … … … … … … … …
1 ⁄ 2
9 ⁄ 16
5 ⁄ 8
11 ⁄ 16
… …
3 ⁄ 4
13 ⁄ 16
7 ⁄ 8
15 ⁄ 16
1
Thread length, I , is based on a length of 12 pitches of the UNC thread series. Thread length, I , is a minimum value and has no tolerance. When thread length, I , is added to neck length, I 1 , the total shall be no less than the minimum thread length, I . Unless otherwise specified, all tolerances are in accordance with Table 5b.
For runout tolerances, see Table 14. For number of flutes see Table 11.
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