sheer pin Q

[SnowRidge]

I think the manufacturers went to grade 2 bolts, when the realized they could save some money, and their customers wouldn't have to stock a supply of specialized shear pins. I used to have to replace shear pins back in the 70s when I was a GI. Now I replace bolts. The bolts are easier.

 

[bx23barry]

We used to give a helper a few boxes of bolts and a hack saw to make "shear bolts" for snow blowers when they were "bad". Shear bolts are implement specific and there is no standard, but there is nothing wrong with using a "weaker" bolt as long as ya don't mind changing them more often.