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Torque is related to friction and diameter. torque usually is done to achieve a preload stress in the bolt of 50% of its ultimate strength
For unlubricatd bolts,
T= 0.2DP where D = diamter and P = bolt preload and T = torque
Bolt preload stress = P/A where A is stress area of bolt
#12 = 0.216 inch diameter, A = 0.024
For standard steel bolts of 80,000 psi strength,
P = 1920/2 = 960 pounds
T = 41 inch pounds
For high strength bolts of 160,000 psi strength,
T = 82 inch pounds
If bolts are lubricated, use
T = 0.15DP
T = 31 in lbs standard and 62 inch pounds high strength
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