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4 24
SCREWS
When ordering wood screws give the length in inches and
then the number which signifies the diameter. The number of
threads, of course, is omitted, because wood screws of a given
number are not made with different pitch of thread.
When ordering screws it is also necessary to specify the kind
of head wanted.
The length of round head screws and fillister head screws
are measured under the head, while flat head screws are meas-
ured over all.
The difference between each consecutive number on the
screw gage is 0.013 16 inch; but as the sizes given in the following
table are expressed in only four decimals, the difference between
each consecutive number will vary from 0.0131 to 0.0132 inch.
TABLE No. 63. Dimensions o1 Machine Screws.
[American Screw Company]
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