The ISO 3601 metric-size O-rings quickreference chart lists the O-rings in millimeters, with IDs from 0.74 to 658.88 mm, and cross sections (widths) from 1.02 to 6.99 mm The ISO 3601 metric-size O ...

That’s when you enter the world of SAE vs. metric O-rings, special compositions and special designs. A world where metric O-rings are fractionally smaller in cross section than SAE O-rings ...