1-111
Table 1-33.—Screw, Drill, and Tap Data
MACHINE
SCREW
THREADS
PER INCH
CLEARANCE
DRILL
TAP DRILL
NO.
DIA.
COARSE
FINE
NO.
DIA.
NO.
DIA.
0
0.060
80
52
0.063
56
0.046
1
0.073
64
72
47
0.078
53
0.059
2
0.086
56
64
42
0.093
50
0.079
48
47
0.079
3
0.099
37
0.104
56
45
0.082
40
43
0.089
4
0.112
31
0.120
48
42
0.093
40
38
0.101
5
0.125
29
0.136
44
37
0.104
32
36
0.107
6
0.138
27
0.144
40
33
0.113
32
29
0.136
8
0.164
18
0.169
36
29
0.136
24
25
0.149
10
0.190
9
.196
32
21
0.159
24
16
0.177
12
0.216
.228
28
14
0.182
20
7
.201
1/4
0.250
17/64
28
3
.213
*Size for use in hand-topping brass or soft steel; for copper, aluminum, bakelite, or
similar material use one size larger.
Logarithms, Common
Table 1-34 is a seven-place table of logarithms.
