November 1960 Popular Electronics
Wax nostalgic about and learn from the history of early electronics. See articles
published October 1954 - April 1985. All copyrights are hereby acknowledged.
Bristo Socket Head Cap Screw manufactured by the Bristol
Company of Waterbury, Connecticut
Sure, there are lots
of resources on the Internet for identifying various screw types, styles, shapes,
and sizes, but sometimes there are so many that it can be time consuming to peruse
through them all, particularly if what you are looking for is an older type. This
chart from a 1960 edition of Popular Electronics magazine might be just the thing
you have been looking for when working on a piece of vintage electronic and/or mechanical
gear. Interestingly, at first I thought there might be a typographical error in
labeling one type screw head as "Bristo," thinking it is probably supposed to be
"Bristol." I could not find many references to a Bristo screw type in searches,
but evidently it did exist back in the day. They now go by the name Bristol.
Screws: Styles, Sizes and Shapes - Handy reference diagrams you
Courtesy or Vaco Products Company, Chicago, Ill.
|Metal screws are made in a wide variety of
head styles, diameters, and lengths. Both stove bolts and machine screws are available
in most head styles in numbered sizes from 0 to 16 and in fractional-inch sizes
from 1/4" to 3/4".
Standard Types of Screw Driver Bits and Screw Openings
Standard Metal Screw Styles
Wood screws are available in a wide variety of diameters-from No. 2 to No. 8
and lengths of from 1/4" to 4".
Wood Screw Styles
Set screws come in diameters from No.4 to 1", lengths from 1/8" to 3", Both headed
and headless styles are available in the point types shown.
Set Screw Styles (Head and Headless)
Socket screws come in numbered sizes from 4 to 10, inch sizes from 14" to 1",
and in almost any length.
Socket Screw Styles (Allen or Bristo Openings)
Self-tapping screws are produced in virtually any thread style and virtually
any head style in a variety of lengths. Either slotted or Phillips type openings
are available in sizes from No. 0 to No, 24.
Self Tapping Metal and Sheet Metal Screws
Posted February 7, 2022
(updated from original post on 5/25/2014)