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Every piece of gear i have that uses shear bolts uses grade 2. IMHO, I think it is dangerous and irresponsible to advise someone to use a higher grade / harder bolt that was designated by the manufacturer. All my mowers ( ford, KK, Howse ) use grade 2 bolts for shearing. I know plenty of people who used grade 5 and then blew up snow blowers, aand even a fellow who rented a tractor and brush hog and blew up the pto on the tractor for a cool 3000$ repair bill he had to foot, cause he put in a grade 5 bolt. The smearing on a soft bolt is no big deal. Besides.. your yoke ID and OD should be very close tolerance.. if not.. they are worn. I fthe bolt does smear a bit, then it will still be easy to knock out due to the fact that it is a 'soft' bolt.. a good punch and a whack with a hammer is all it has ever taken me in the worst condition. usually I just line up the new bolt and hit it with the hammer, and drive the old slug out while seating the new one.. nut it and go. Use however hard a bolt you want in your own equipment.. but don't advise others to use a bolt harder than their equipment manufacturer calls for, unless you are voulunteering your time and money to go finish their job, repair their equipment, and cover any liabilites that arise from the use of the non specified hardened bolt. Soundguy
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