This guide contains four size charts:
l Chart 50: including BS 1806,
SAE AS 586, and BS ISO 3601-1
(non-aerospace). Note: BS 1806 has
been superseded by BS ISO 3601-1
and BS ISO 3601-2.
l Aerospace sizes to BS ISO 3601-1.
l Chart 72: metric sizes to BS 4518.
l Chart 17000: James Walker inch sizes.