Bearing No. Boundary Dimensions(mm) d D B 71803 17 26 5 71804 20 32 7 71805 25 37 7 71806 30 42 7 71807 35 47 7 71808 40 52 7 71809 45 58 7 71810 50 65 7 71811 55 72 9 71812 60 78 10 71902 15 28 7 71903 17 30 7 71904 20 37 9 71905 25 42 9 71906 30 47 9 71907 35 55 10 71908 40 62 12 71909 45 68 12 71910 50 72 12 71911 55 80 13 71912 60 85 13