In the English system, it is standard practice to dimension keyways. The hub keyway is dimensioned by its width and depth on the shaft – keyway sides. Referencing Figure 1, the keyway dimension is W x T1. Unless otherwise specified, the shaft keyway is assumed to be standard.

Which key is required for key hub?

a) Flat saddle key A flat saddle key is a taper key which fits in a keyway in the hub and is flat on the shaft. Therefore it is used for comparatively light loads.

What are shaft keyways?

A keyway is a recess in a shaft or hub to receive a key, and these recesses are commonly cut on key-seating machines or by broaching, milling, planning, shaping and slotting.