No, not really. They need to be tight enough that they will not rotate in service, but there is no specified torque value for them.
Torque values are typically designed to stretch a bolt placed in tension. Hangar bolts and the like are stressed in shear and, thus, don't need to be torqued to any specific value, but rotation is a no-no.
Tighten the bolts enough that they won't rotate, but don't bend the hangers. Make sure that there are a couple of threads extending beyond the nuts and make sure there is some form of locking mechanism on the nuts. I would guess that elastic stop nuts are the most common form of locking devices....
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2013 6.2L K1500 Chevrolet
2006 Hornet 27RLS
1987 23' Grady-White
2005 20' Angler CC
2005 17' G3 CC
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