[GreenKeys] Fw: Thread standards for Teletype screws

[John Gibson]

6-32, 8-32, and 10-32 should be readilly available at your local hardware store.  BUT, many of the screws used in teletype machines are 6-40, which can be difficult to find.  However, 6-40 is a common size used in gunsmithing and should be available at gun parts outfits like Brownell's.  8-36 and 8-40 can be really tough to find.
 
You can verify that it is a 40 pitch thread by holding the thread against the thread on a 4-40 screw which any hardware store should have.
 
John
K9KRW
 
----- Forwarded Message -----
From: "WA5CAB at cs.com" <WA5CAB at cs.com>
To: nagle at animats.com; greenkeys at mailman.qth.net 
Sent: Tuesday, October 2, 2012 11:25 AM
Subject: Re: [GreenKeys] Thread standards for Teletype screws
  

#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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