Technical Handbook O-rings 14. O-ring Size Charts
14. O-ring Size Charts Note: The AS O-ring Size Chart has a column that shows the Nominal Size along-side the Actual Size. Originally the nominal size was just for a listing of the approximate fractional dimensions of the O-ring. 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 ...