O Ring Measurement Guide

Until now o ring standards have left a gap between the 1 8 and 3 16 nominal cross sections.
O ring measurement guide. From the finest precision seals to the. In de signing this new group of o rings we left spacing in the part numbers to allow us to add additional sizes should they be required. This o ring size chart can help you find the as568 size o ring or the metric sizing of standard size o rings. Metric o rings and custom size o rings are often used when a standard o ring size will not fit an application or existing hardware.
O ring size charts note. Originally the nominal size was just for a listing of the approximate fractional dimensions of the o ring. Printable paper strip. Place the ring over the circles lining up the inside edges of the ring to the circle that best matches on the ring size chart.
Whether your application conforms to u s japanese jis british bs or common metric sizing for o rings these o ring size charts will help you locate the right o ring size. The standard sizes used by o ring manufacturers in the united states are defined by aerospace standard as568b aerospace size standard for o rings. Nominal cross section o rings. To make sure it s printed to actual size choose scale 100 when selecting your print options.
This as568 o ring chart is a sae size standard for o rings and shows as568 rev b or as568b o ring sizes which supersedes as568 rev a or as568a o ring dimensions. O ring size chart of standard sizes of o rings in as 568 and bs 1806 iso 3601 metric sizes o rings in nbr silicone viton rubbers. Print the the ring size chart. Prior to the common use of dial calipers many people called out a 1 inch by 1 1 4 rt o ring this was a dash 214.
M seals specialises in seals for industrial use. The as o ring size chart has a column that shows the nominal size along side the actual size. The proper o ring size is a fundamental aspect of proper o ring performance. Popular o ring size standards include usa s as568 o ring size chart the uk s bs 1806 o ring sizing chart and japan s jis b 2401 o ring size list.
That document published by the society of automotive engineers sae lists the sizes of o rings in six series or groups in both inches and millimeters. If the ring is in between two sizes choose the larger ring size.