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== Machine Screw Diameters ==
== Machine Screw Diameters ==


By [[H. J. Coventry]]
By [[Harry Coventry|H. J. Coventry]]


<i>[[The Miniature Locomotives]]</i>, July-August 1954
<i>[[The Miniature Locomotive]]</i>, July-August 1954


Machine screws are numbered as distinct from Cap Screws, Bolts, etc, and range usually from #0 to #12.  A convenient method of finding the exact diameter if a table is not handy is as follows:
Machine screws are numbered as distinct from Cap Screws, Bolts, etc, and range usually from #0 to #12.  A convenient method of finding the exact diameter if a table is not handy is as follows:

Revision as of 00:02, 9 February 2014


Machine Screw Diameters

By H. J. Coventry

The Miniature Locomotive, July-August 1954

Machine screws are numbered as distinct from Cap Screws, Bolts, etc, and range usually from #0 to #12. A convenient method of finding the exact diameter if a table is not handy is as follows:

Multiply the number of 13 and add sixty thousandths. The answer will be thousandths.

Examples:

  • #0 -- 0 multiplied by 13 equals 0, plus 0.060 equals 0.060
  • #3 -- 3 multiplied by 13 equals 39, plus 0.060 equals 0.099
  • #5 -- 5 multiplied by 13 equals 65, plus 0.060 equals 0.125
  • #10 -- 10 multiplied by 13 equals 0.130, plus 0.060 equals 0.190