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 TM 55-1905-223-24-1
TAP DRILL SIZES
NATIONAL COARSE OR U.S.S.
NATIONAL FINE OR S.A.E.
Screw
Thread Use
Screw Threads
Use
Screw
Threads Use
Screw Threads
Use
& Tap
Per
Drill
& Tap Per
Drill
& Tap
Per
Drill
& Tap Per
Drill
Size
Inch
No.
Size
Inch
No.
Size
Inch
No.
Size
Inch
No.
No. 5
40
39
1/2
13
27/64
No. 5
44
37
1/2
20
29/64
No. 6
32
36
9/16
12
31/64
No. 6
40
33
9/16
18
33/64
No. 8
32
29
5/8
11
17/32
No. 8
36
29
5/8
18
37/64
No. 10
24
25
3/4
10
21/32
No.10
32
21
3/4
16
11/16
No. 12
24
17
7/8
9
49/64
No. 12
28
15
7/8
14
13/16
1/4
20
8
1
8
7/8
1/4
28
3
1-1/8
12
1-3/64
5/16
18
F
1-1/8
7
63/64
5/16
24
1
1-1/4
12
1-11/64
3/8
16
5/16
1-1/4
7
1 and
3/8
24
Q
1-1/2
12
1-7/64
7/64
7/16
14
U
1-1/2
6
1 and
7/16
20
W
11/32
D-4
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