No they are not shear pins. I have never heard of anyone shearing them. On the other hand I’ve lost a couple and many of those dang cotter pins.
Next I’m going to buy the pins with bales on them
HAHA< I too have lost a few of them over the yr, in hard crunchy snow they will get caught and if moving JUST right they will open the pin end and then slide out as you work the plow
I started to paint mine bright colors, and this way when they come out I can find them pretty quick, as I always notice when one is OUT, as the plow swings left and right when lifted more than the normal movement
Safety Orange seems to be the easiest color to find for me too LOL