I deal with hydraulic rams, rotators, motors and pumps everyday. Orings are measured from there ID with sections of 1/16(1.78mm), 3/32(2.62mm), 1/8(3.53mm),3/16(5.33mm) and 1/4(6.99mm) you can get metric as well tho. generally allow for 0.5mm draw. Your orings will be deformed if you measure the height plus the width add together then divide by two it will give you fair idea of the section,Pm me if you get stuck
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