SAE & ORS Hydraulic Fitting Replacement O-Ring Chart 73 Thread size indicates the diameter of the threaded area in fractions of an inch and number of threads per inch. NA = not a current CMW part numbered o-ring, or dash size does not occur in current CMW applications SAE = straight thread fitting that seals by sandwiching a hard o-ring between a shoulder on the male part and an angular surface at the mouth of the female port.
ORS = o-ring face seal; a type of fitting that seals by compressing a hard, captive o-ring between two flat parallel faces, one grooved for the o-ring and the other plain to act as the sealing surface Fraction Size Dash Size SAE (Port Seal O-Ring) ORS (Face Seal O-Ring) Thread Size O-Ring P/N Thread Size O-Ring P/N 1/16 1 NA NA NA NA 1/8 2 5/16 - 24 NA NA NA 3/16 3 3/8 - 24 NA NA NA 1/4 4 7/16 - 20 155-760 9/16 - 18 157-037 5/16 5 1/2 - 20 NA NA NA 3/8 6 9/16 - 18 155-705 11/16 - 16 157-038 1/2 8 3/4 -16 155-706 13/16 - 16 157-039 5/8 10 7/8 - 14 155-707 1 - 14 157-040 3/4 12 1-1/16 - 12 155-709 1-3/16 - 12 157-017 7/8 14 1-3/16 - 12 155-747 NA NA 1 16 1-5/16 - 12 155-748 1-7/16 - 12 155-714 1-1/4 20 1-5/8 - 12 155-702 1-11/16 - 12 NA 1-1/2 24 1-7/8 - 12 157-001 2 -12 NA 2 32 2-1/2 - 12 NA NA NA 2-1/2 40 3 - 12 NA NA NA 3 48 3-1/2 - 12 NA NA NA