[GreenKeys] Thread standards for Teletype screws

[WA5CAB at cs.com]

#6-32 UNC and #8-32 UNC aren't "modern".  They are the same "age" as all of 
the UN fasteners.  The screws commonly used on M14/15 do match current 
common standards.  They are common #6-40 UNF, #8-40UNF and #10-32UNF.  The six 
sizes (three UNF and three UNC) were all standardized at the same time.  
Three of them, for no particular practical reason other than maybe it's hard for 
some people to remember three thread pitches, are more common today in the 
small percentage of  consumer goods still produced in this country.

In a message dated 10/02/2012 12:50:49 PM Central Daylight Time, 
nagle at animats.com writes: 
>    Model 14 and 15 Teletypes use screws that don't match
> current common standards.  Does anyone have the specs for
> those fasteners?
> 
>    Small screws are usually 0.013" diameter, but they're
> not modern 6-32.  Are they 6-40?  Whitworth?  USS?  Or what?
> 
>                     John Nagle

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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