[Elecraft] understanding screw sizes

[Pierfrancesco Caci]

Hello,
while lenght of the screws is given in the manual in mm also, I'm
trying to figure out how to read the screw and washer diameters
that are given as "4-40" and such. Is this the relevant standard?
http://en.wikipedia.org/wiki/Unified_Thread_Standard 

For washers, the first number should be the size of the hole, right?

Pf



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Pierfrancesco Caci, ik5pvx