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Bruce Lancaster · 09-07-2011, 09:51 AM

On the need for shoulder...these bolts have to locate the PP as well as clamp it on, hence the need so that the bolts can also function as dowels to get the thing in the right place. Obviously they are highly stressed items with really bad potential failure modes, so buy something made for the purpose or a bolt from a serious supplier like an industrial supply.
Lines on bolt heads mean very little if bought at the corner dime store...there is no enforcement of SAE grade standards and the Chines have learned we like lines on our bolts!
Originals are of course not lined...they predate that system, but Ford made very high standard fasteners.

09-07-2011, 09:51 AM	#22
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: pressure plate bolt size? On the need for shoulder...these bolts have to locate the PP as well as clamp it on, hence the need so that the bolts can also function as dowels to get the thing in the right place. Obviously they are highly stressed items with really bad potential failure modes, so buy something made for the purpose or a bolt from a serious supplier like an industrial supply. Lines on bolt heads mean very little if bought at the corner dime store...there is no enforcement of SAE grade standards and the Chines have learned we like lines on our bolts! Originals are of course not lined...they predate that system, but Ford made very high standard fasteners.