1.1 .I This Standard covers requirements for square
and rectangular parallel keys and keyways intended for
both alignment of shafts and hubs, and transmitting
torque between shafts and hubs.
1.1.2 Keys covered by this Standard have a relatively
tight width tolerance. The deviations are less than the
basic size. Keys with greater width tolerance and with
deviations greater than the basic size are covered by
ASME B18.25.3M.
1.1.3 The inclusion of dimensional data in this
Standard is not intended to imply that all sizes described
are production stock items. Consumers should consult
with suppliers concerning lists of stock items.