[GreenKeys] Thread standards for Teletype screws

[Don Robert House]

On 2 Oct 2012, at 12:54 PM, Jim Haynes wrote:

6-40, 8-36 and others.  There is a standard, National Fine, as opposed
to National Coarse which brings us 6-32 and 8-32 and 10-24.


AND do not forget relay rack screws... EIA racks use 10-32 but TELCO  
racks use 12-24 and they are not easy to find.
Also EIA racks have standard widths of 19" and 24".  TELCO standard  
widths are 23" widths
Don't ask me why.