Vs.
These different kinds of bolts can bear different amounts of weight and different kind of weight. Grade 5 bolts have been hardened and are often used for automotive reasons. Grade 8 are a lot stronger in that they can hold more weight, such as in suspensions. All this being said, the Grade 5 is a bit cheaper than the Grade 8, and it really depends on what you need to be held together. For reliable, heavy duty applications, Grade 8 would be best.
Any idea what the shear rating is for these bolts?? Are there any markings on the actual bolts that indicate their rating?
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