Thread Diameter	Grade 2	Grade 5	Grade 8
1/4"	5 ft-lbs	7 ft-lbs	10.5 ft-lb
5/16"	9 ft-lbs	14 ft-lbs	22 ft-lbs
3/8"	15 ft-lbs	25 ft-lbs	37 ft-lbs
7/16"	24 ft-lbs	40 ft-lbs	60 ft-lbs
1/2"	37 ft-lbs	60 ft-lbs	92 ft-lbs
9/16"	53 ft-lbs	88 ft-lbs	132 ft-lbs
5/8"	74 ft-lbs	120 ft-lbs	180 ft-lbs
3/4"	120 ft-lbs	220 ft-lbs	220 ft-lbs
7/8"	190 ft-lbs	302 ft-lbs	473 ft-lbs
1"	282 ft-lbs	466 ft-lbs	714 ft-lbs