A parallel sunk key is a taperless key

A parallel sunk key may be rectangular or square in cross-section

A flat saddle key is a taper key which fits in a key way of the hub and is flat on the shaft

all of the above

0.5 d

0.75 d

d

1.25 d

light series whose bore is 5 mm

light series whose bore is 25 mm

medium series whose bore is 5 mm

medium series whose bore is 25 mm

radial load only

axial load only

both radial and axial loads and the ratio of these being less than unity

both radial and axial loads and the ratio of these being greater than unity

tempering

annealing

normalising

spheroidising