1.1.1 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
loose width tolerance. All width tolerances are
positive. Keys with minus width tolerances and a smaller
tolerance range are covered by ASME B 18.25.lM.
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.