Flange Size ASA/ANSI lb. Class GASKETS "E" O.D. Inches "F" O.D. Inches "D" RTJ ASA Ring No. 4 150 9 6-11/16 R-36 300 10 6-15/16 R-37 400 10 6-15/16 R-37 600 10-3/4 7-7/16 R-37 900 11-1-2 7-15/16 R-37 1500 12-1/4 8-1/16 R-39 2500 14 9-1/16 R-38 5 150 10 7-9/16 R-40 300 11 8-5/16 R-41 400 11 8-3/16 R-41 600 13 9-5/16 R-41 900 13-3/4 9-9/16 R-41 1500 14-3/4 9-13/16 R-44 2500 16-1/2 10-13/16 R-42 6 150 11 8-9/16 R-43 300 12-1/2 9-11/16 R-45 400 12-1/2 9-9/16 R-45 600 14 10-5/16 R-45 900 15 11-3/16 R-45 1500 15-1/2 10-15/16 R-46 2500 19 12-5/16 R-47 8 150 13-1/2 10-13/16 R-48 300 15 11-15/16 R-49 400 15 11-13/16 R-49 600 16-1/2 12-7/16 R-49 900 18-1/2 13-15/16 R-49 1500 19 13-11/16 R-50 2500 21-3/4 15-1/16 R-51 10 150 16 13-3/16 R-52 300 17-1/2 14-1/16 R-53 400 17-1/2 13-15/16 R-53 600 20 15-9/16 R-53 900 21-1/2 16-15/16 R-53 1500 23 16-15/16 R-54 2500 26-1/2 18-9/16 R-55 12 150 19 15-15/16 R-56 300 20-1/2 16-17/16 R-57 400 20-1/2 16-5/16 R-57 600 22 17-13/16 R-57 900 24 19-7/16 R-57 1500 26-1/2 20-5/16 R-58 2500 30 21-7/16 R-60 14 150 21 17-9/16 R-59 300 23 18-15/16 R-61 400 23 18-13/16 R-61 600 23-3/4 19-3/16 R-61 900 25-1/4 20-5/16 R-62 1500 29-1/2 22-9/16 R-63 16 150 23-1/2 20-1/16 R-64 300 25-1/2 21-1/16 R-65 400 25-1/2 20-5/16 R-65 600 27 22-1/16 R-65 900 27-3/4 22-7/16 R-66 1500 32-1/2 25-1/16 R-67