It's already been pointed out that "4" in "4-40"
defines to the size of the screw / hole, and "40"
is the threads-per-inch specification.
There are three kinds of lock washers used in
Elecraft kits and each has a specific application.
The "split" is obvious, and there are both internal
and external tooth lock washers. Elecraft does
a good job of illustrating the differences with the
photographs in the assembly manuals.
73! Ken Kopp - K0PP
[email protected]
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