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422 SCREWS.
Note.—In finished work, the thickness of the head of the
bolt and the nut is equal, and is Yi6 of an inch less than the
diameter of the bolt.
Columns B and C in Table No. 59 are very useful for many-
purposes ; for instance, in selecting size of counter-bore when
finishing castings, to give bearing for screw heads : in turning
blanks which are afterwards to be cut into square or hexagon
heads, etc.
Table No. 60.—Coupling Bolts and Nuts.
(Hexagon).
(All Dimensions in Inches)
u
<v
-4->
<D
1
3
W3 . Dimensions of Head and Nut.
Across
the Flat.
Across
the
Corner.
Length
of Head
or Nut.
a
i
i/
13
11
10
9
8
7
7
7/8
ItV
1*
ItV
15/8
HI
2
1A
Hi
1ft
m
1/8
9 3
Z 32
2ft
3/
n
i
1/8
Table No. 61 -Round and Fillister Head Screws.
(All Dimensions in Inches).
Diameter of
Screw.
Number of
Threads per
Inch.
Diameter of
Head.
Length of
Head.
/8 40 ft /8
3
T6 24 a ft
% 20 3/8 #
ft 18 7 5
T^
3/4 16 9
TS 3/8
7
T^ 14 5/8
7
T^
# 13 tf X
ft 12 1 3
T6 ft
5/8 11 % 5/8
M 10 1
tf
/8 9 1/8 #
1 8 1* 1
Round Head
Cap Screw. *
Fillister Head
Screw, t
* This form of head is also called Flat Fillister Head.
t This form of head is also called Oval Fillister Head. See page 431.
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