Fastener torque values:

From the " Standard Aircraft Handbook" by Larry Reithmaier, page 150:  

 

fine thread series, standard type nuts ( MS20365, AN310, AN315)  

bolt size  10-32(AN3)  20-25 inch/lbs  

               1/4-28          50-70 inch/lbs  

               5/16-24       100 - 140 inch/lbs  

               3/8 - 24       160 - 190 inch/lbs  

               7/16 - 20     450 - 500 inch/lbs  

               1/2 - 20       480 - 690 inch/lbs  

              9/16 - 18      800 - 1000 inch/lbs  

             5/8 -18         1100 - 1300 inch/lbs  

              3/4 -16        2300 - 2500 inch/lbs