Diameter of Tap Drill Machinery's Handbook, 31st Edition
2159
Table 2. Tap Drill Sizes and Percentage of Thread (Unified Threads) Taps Size Threads per Inch Drill Size Percentage of Full Thread No. or Letter Fractional Inch mm Decimal Inch Table 2. (Continued) Tap Drill Sizes and Percentage of Thread (Unified Threads) Nut Minor Diameter, min a max
0.5000 0.4921 0.4844 0.5156 0.5118 0.5312 0.5265 0.5512 0.5469 0.5312 0.5781 0.5709 0.5937 0.5890 0.6693 0.6563 0.6496 0.7031 0.6890 0.6875 0.7187 0.7140 0.7813 0.7656 0.8125 0.8071 0.8281 0.8210 0.8437 0.8390 0.9055 0.8906 0.8750 0.9219
58 65 72 65 70 65 75 62 66 79 65 75 65 75 62 72 77 58 75 77 65 75 65 76 67 73 65 75 65 75 58 67 77 72
0.4723 0.4843
16 –12
9 ⁄
1 ⁄
…
…
2
12.5
… …
31 ⁄ 33 ⁄
… … 13 … … 14 … … … … … 17 …
… …
64 64
0.5024 0.5106 0.5234 0.5273 b 0.5266 0.5391 0.5649 0.5730 0.5860 0.5912 0.6417 0.6545 b 0.6823 0.6908 0.7102 0.7164 c 0.7547 0.7679 0.7977 0.8068 0.8149 0.8223 b 0.8340 0.8406 c 0.8647 0.8797
16 –18
9 ⁄
… …
16 –27
9 ⁄
17 ⁄
… …
32
c
8 –11
5 ⁄
… …
35 ⁄ 17 ⁄ 37 ⁄
… … …
64 32 64
8 –18
5 ⁄
14.5
… …
8 –27
5 ⁄
19 ⁄
… …
32
c
4 –10
3 ⁄
… …
c
21 ⁄
32
16.5
… …
4 –16
3 ⁄
45 ⁄
…
…
64
17.5
… …
11 ⁄ 23 ⁄
… …
… …
64 32
4 –27
3 ⁄
c
… …
8 –9
25 ⁄ 49 ⁄ 13 ⁄
7 ⁄
… … …
… … …
32 64 16
8 –14
7 ⁄
20.5
… …
8 –18
7 ⁄
53 ⁄
…
…
64
c
… …
8 –27
27 ⁄
7 ⁄
…
…
32
c
… …
1–8
23.0
… …
57 ⁄
… … …
… … …
64
7 ⁄
8
1–12
0.9098 0.9198
59 ⁄
64
a Unified or American Standard Threads. b Not based on Unified or American Thread Standards. c Special drill required for this size as the next size smaller gives too great a percentage of thread.
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