Hardware Store Grade 8 Head Bolts

Home Depot bolts went in just fine
torqued up to 95ish lbs

Putting on the lifter rails reusing the old bolts and the 3rd bolt I tried to torque down, snapped
back to home depot looking for grade 8 6/16 bolts bu they only had grade 5 (which is what the stockers are)

Now I have to get that other half bolt out of t here and start again
I'll get to it in the morning