PART NO. THREAD O-RING DIMENSIONS E F E F A B L S 1EO-16-05 M16X1.5 1/2"X20 11X1.9 10.52X1.83 11 9.14 25 17 1EO-18-04 M18X1.5 7/16"X20 13X1.9 8.92X1.83 11 9.14 26 19 1EO-18-08 M18X1.5 3/4"X16 13X1.9 16.36X2.21 11 11.13 30 22 1EO-24-10 M24X1.5 7/8"X14 18X2.4 19.18X2.46 12 12.7 34.5 27 1EO-36-12 M36X2 1.1/16"X12 30X3.1 23.47X2.95 16 15.09 44 38 1EO-39-20 M39X2 1.5/8"X12 32X3.1 37.46X3.00 18 15.09 48 50 1EO-52-24 M52X2 1.7/8"X12 40X3.1 43.69X3.00 22 15.09 52 55 Note:The parameter of E end O-Ring is ring outside diameter and ring width.