[Ducati] Waisted bolts ...

[Wright, Dirk]

The purpose of reduced diameter "waisted" bolts and studs is:

"The shank diameter of a 'waisted' bolt is less than the thread diameter thus allowing a radiused thread runout which reduces stress concentration"

If the shank diameter is the same size as the outside diameter of the threads, then a stress concentration is developed where the threads end. 

-----Original Message-----
From: ducati-bounces at ducati.net [mailto:ducati-bounces at ducati.net]On
Behalf Of Ronald Betts
Sent: Tuesday, May 02, 2006 11:11 AM
To: ducati at ducati.net
Subject: RE: [Ducati] Waisted bolts ...


One thing I might add to this thread is while earning my A&P I had the 
oppertunity to disassemble alot of aircraft powerplants and in almost every 
case the things were assembled with waisted bolts and studs. Maybe the 
engineers knew something I didnt at the time. And some of this stuff was 
older than me  (52) and probably in better shape . Also It was a big FAA no 
no to lube threads of a torgued fastner.



Peace...Ron"Desmohead"Betts 95 900 SP
I've learned that I don't suffer from insanity, I enjoy it!