bill18163
Silver Member
I have a Loftness three point hitch snowblower. There are three shear bolts in the machine. Two are in the machine itself and one is in the PTO shaft. The two in the machine are Grade 5(has three radial lines in the head of the bolt) and the one in the PTO shaft is a Grade 2(has no radial lines in the bolt head). There are no grooves cut in the bolts. I have never sheared the Grade 5's. The Grade 2 in the shaft has always gone first. Replaceing the sheared bolt is about 10 minutes work. Buy them by the pound at TSC. Just for reference sake if you see six radial lines on the head of a bolt it's a Grade 8(don't EVER use them for shear bolts). It takes 120,000 PSI to break a Grade 8, 85,000 PSI for a Grade 5 and 55,000 PSI for a Grade 2.