George Lendich wrote:

. One other question I have is. If titanium is not the material to use what
is ?

                       Respectfully, Tony

Good question. One of the steels obviously. Starting with 4130 heat

treated,

shot peened and rolled threads.  Perhaps 4130 is not optimum. Also you

want

to make a distinction between a bolt and a stud. A bolt has exposed

threads

unlike a properly installed stud. Makes a difference if you are putting
a bending load on the stud or bolt. The bending loads come from the long
bolt vibrating in the over size housing bores.

Paul Lamar

Paul,
I guess I will have to look at this for my single rotor, so this discussion
is timely for me.
So I would be happy if someone told me what the current bolts are made of,
and what characteristics I have to look for.

Perhaps 4340 might be a good material,s it is extremely tough.
George ( down under)

 
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