This describes an assembly where a solid metal insert has been installed between a shaft and a mating component to lock them rotationally. A keyed joint relies on the shear strength of the insert to transmit torque, eliminating the need for friction alone to hold the parts together. It ensures precise timing and positive drive in gearboxes and motor couplings.
Heard on the job
We ordered a keyed shaft for the agitator motor because a simple setscrew will just slip under that kind of load.