Mailing List flyrotary@lancaironline.net Message #38250
From: Russell Duffy <rusty@radrotary.com>
Subject: RE: [FlyRotary] Re: Bolt size
Date: Thu, 5 Jul 2007 19:50:39 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
   According to my Copper State Bolt & Nut handbook, M12 bolts come
in two threads: coarse - 1.75 and fine - 1.5.  I'd send you to their web
site, but it appears they are redesigning it. 
 
Hi Dale,
 
Maybe they're redesigning the page to include the 1.25 pitch :-)  
 
McMaster sells M12 in 1.25, 1.5, and 1.75 pitches.  The real problem seems to be deciding what the correct size is.  
 
Wendell,  Just to be sure, are you talking about a motor mount hole in the 2nd gen intermediate housing, or the 3rd gen rear housing?  
 
Rusty  
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