14.5 Degree full depth involute tooth

20 Degree full depth involute tooth

20 Degree involute stub tooth

14.5 Degree Stub tooth

1 kN-m

2 kN-m

3 kN-m

4 kN-m

bearing failure

shearing failure

bending failure

all of these

4

6

8

10

a tapered key with head at one end

fitted in pairs at right angles

capable of tilting in a recess milled out in the shaft

all of the above