For new applications
1) Refer to Design sections, pages
27-31, for guidance with regard to
applications.
2) For aerospace equipment, select ‘O’
ring from Aerospace Sizes to BS ISO
3601-1, pages 17-20.
3) For general metric equipment, select
‘O’ ring from Chart 72, pages 21-22.
4) If the metric size you require is not
available from Chart 72, then select
from the metric columns in Chart 50,
pages 13-16.
5) For general inch sizes, use Chart 50, or
Chart 17000 on page 23.