TUBE OD TUBE OD UN / UNF THREAD UN/UNF S L D1 D2 PART NO. mm Inch mm Inch N N1 mm mm mm mm 10 3/8 6 1/4 9/16 -18 7/16 -20 16 36 7.5 4.5 6-4F-UR 12 1/2 10 3/8 3/4-16 9/16 -18 19 39.5 10 7.5 8-6F-UR 14/ 15/ 16 5/8 12 1/2 7/8-14 3/4 -16 24 45 12 10 10-8F-UR 18/20 3/4 12 1/2 1 1/16-12 3/4 -16 27 49 15.5 10 12-8F-UR 18/20 3/4 14/ 15/ 16 5/8 1 1/16-12 7/8 -14 27 52 15.5 12 12-10F-UR 25 1 18/20 3/4 1 5/16-12 1 1/16-12 1 1/16 -12 36 56 21 15.5 16-12F-UR