different grades of bolts have different strength values and are not made of the same material. a grade 2 will stretch , while a grade 8 will just snap off. plus the grade 8 bolt can be stronger than the thing being clamped. that is why you torque values are engineered into stuff. but i am not am engineer , so maybe one can explain it better. you need to clarify what you mean or give some spec's as to the 2,5, and grade 8 bolts maintaining the same hold down with the same torque. guess i am not the only one wondering what you mean by the 1/4 " bolts at 12 # ?
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