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SCREWS. 423
TABLE No. 62.—Dimensions of Hexagon and Square Head
Cap Screws.
(All Dimensions in Inches).
O
Hexagon Head. Square Head.
"4-4
O
<U 0)
5/5
I s
ia Across Across Across Across
.5« the the the the
Q H Flats. Corners. Flats. Corners.
K 20 A ^ 3/8 » J<
A 18 / H A 5/8
5
3/8 16 A §1 # ft 3/8
7 14 5/8 II A li
7
# 13 3
/ ti Vs
57
64 J*
9
T3"
12 it
1 5
T6^ H 3 1
32 A
$4 11 /
8 1* * *A H
U 10 1 1* /8 1# H
% 9 1/8 i« 1/8 lil X
1 8 1* .1* 1# Iff 1
l 1
/^ 7 1# 1 1 9
^2 1# m l 1
^
1* 7 I 1
/ 1 +7 1/ 2}i itf
WOOD SCREWS AND MACHINE SCREWS
are made from either brass or iron. They have pressed heads,
are manufactured in great quantities, and listed and sold to
the trade by the gross. They are made in such sizes,
that the diameter is expressed in numbers ranging from No. I
to No. 30, and the length is given in inches. The higher
the number, the larger the diameter of the screw. For in-
stance, a number five machine screw or wood screw is one-eighth
inch in diameter (very nearly) but a screw number 24 is three-
eighths of an inch in diameter (very nearly).
Screws of the same number have the same diameter wheth-
er they are machine screws or wood screws. The difference is,
as the name implies, that one kind of screws is provided with
a thread of fine pitch, suitable for metal, and the other kind
is provided wich a thread of coarse pitch, suitable to go into wood.
When ordering machine screws, always give the length
first, then the number and then the thread. For instance, when
we say, "1 inch, 14 by 24 machine screw," we mean a screw 1 inch
long, No. 14 diameter (very nearly X inch) and threaded with
24 threads per inch.
If we change this expression and say "1 inch, 24 by 14 machine
screw," we will get a screw 1 inch long, No. 24 diameter (very
nearly Y% inch), having 14 threads per inch.
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