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426 SCREWS
TABLE No. 65 -Sizes of Machine Screws and
Drills.
Diameter of Tap Drills
(will give erood but not full Diameter
Diameter of Screws ^5
G
u
thread) of
Body Drills
I^ight Stock Heavy Stock
i-c
V
.Ha Size in
u u u
V
.a
B
a
<L>’cj
N 5
Fractions
^3
a
s
Size a
3
Size a
3
Size
fc so {H fe & &
2 o . 0842 &+O.OO7 64 50 O.070O 49 O.073O 44 O . 0860
3 0.0973 3
3
2 + O.O03 56 46 0.0810 45 O.0820 40 O.O982
4 0.1 105 /5+O.OOI 40 44 O.0860 43 . 0890 34 O. IIIO
5 0.1236 f — 0.001 40 4 1 . 0960 38 O.IOI5 30 O.I285
5 36 4 1 . 0960 39 0.0995
6 0.1368 6
9
¥ - 0.004 36 36 O.IO65 33 0.II30 28 O.I405
6 32 37 O.IO4O 35 0. I 100
7 0.1500 ¥% — 0.006 32 32 O.II6O 31 0.1200 23 0.1540
7 30 32 2. I l60 31 0. 1200
8 0.1631 3
5
2 +0.007 36 29 O.I36O 28 O.I405 19 O.I660
8 32 30 O.I285 29 O.I360
9 0.1763 11+0.004 32 28 O.I405 26 O.I470 16 0.1770
10 0.1894 T%-0.002 32 22 O.I570 20 O.I6IO 11 0.I9I0
10 30 23 0.1540 22 O.I570
12 0.2158 A-0.003 24 18 0.1695 17 0.1730 2 0.2210
14 0.2421 i—0.008 24 9 O.I96O 7 0.2010 i O.25OO
14 20 13 O.185O 10 0.1935
16 . 2684 H+0.003 20 6 . 2040 3 0.2I30
K 0.28I3
18 0.2947 if—0.002 20 I 0.2280 15//
64 O.2344 5 //
0.3I25
20 0.3210 li+0.002 18 D O.246 i" O.25OO 21//
6I„ O.328I
22 0.3474 ii+o. 003 18 J O.272 9 //
¥2 0.28I3 2 3’/
0.3594
24 0.3737 f— 0.001 16 L O.29O 5 //
T6 0.3125 1" 0.3750
26 .
4000 If— 0.006 16 0.316 2 1//
64 O.328I 13//
32 O.4063
28 0.4263 11+0.004 14 Q 0.332 1 1//
3"2 0.3438 1 II
T6 0-4375
30 0.4526 f| — 0.001 14 T 0.358 f" 0.3750
15//
32 O.4688
The size of drill as given for light stock will be found
practical when the thickness of the stock is about equal to the
diameter of the tap ; but when the thickness of the stock is
more, it is better to use a little larger drill as given for heavy
stock, because there will then be less strain on the taps, and
also because when the hole is deep, the threads will, in most
cases, be strong enough even if they are not quite so full.
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