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Louis,

I am not an engineer, and don't want to confuse
things, but I believe what you have are "flanged" or
"flange" bolts. What I have always known
as "shouldered" or "shoulder" bolts have a part of the
shank a larger diameter than the threaded part, so the
nut can be tightened against the shoulder, instead of
the head. A self- contained spacer, so to speak. A
flange bolt has a self-contained washer, which sounds
like what you have. The URL of the picture you posted
would indicate that also.

For pictures of both kinds of bolt on one page, with
explanations, see:

<http://www.mrcind.com/exparts.htm>

Not the biggest pictures, but I think you can see the
important parts in the top two sections. (In the "Hex
Flange Head Bolts" picture, the top bolt is a
flange-shoulder bolt. In fact, in the "Shoulder Bolts"
picture, most of the pieces shown are flange-shoulder
bolts, but the shoulders are obvious near the threaded
sections.)

Why a flywheel would use shoulder bolts I don't know,
but as I said, I'm not an engineer, I'm not even sure
I've spelled it right :) But double check your
Bentley; IIRC, shoulder bolts generally take *less*
torque than standard bolts, due to a weak spot between
the threads and the shoulder.

Good luck, and if you find the definitive answer,
please post it, my son's QSW definitely needs a new
clutch, so I'll probably be facing those bolts soon :(

Rory


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