8 9 x 7 16 July 8, 2019 16 32 64 128 8 9 7 15 x 3 16 9 16 x 7 grade 8 bolt 16 9 x 7 8 x 7 2 7 8 x 2 x 9 16 bearing 9 x 8 = 8 x 9/16
