Solve for External Torque T  
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Diagram shows an aluminum shaft A B with a support at A, marked 1 of length 4,000 millimeters and a brass shaft B C with a support at C, marked 2 of length 3,000 millimeters with a flange in between at B. The shafts are centered on the x axis. A torque T is applied at B.

Substitute these values

T1=4,253.92 N-mT2=-5,026.55 N-m

into the equilibrium equation

T=T1-T2

to determine the external torque that can be applied to the composite shaft.

T=T1-T2  =4,253.921 N-m-(-5,026.549 N-m)  =9,280.470 N-m