Norton gearbox top mounting bolt nut, for upright gearbox (later 1940+), new. This nut is the larger version , 1 1/2inches long and flats are 15/16 inch long and 13/16in across the flats, 5/8 ID. Original part numbers: part of 3618; 9460; A2/311 - Gearbox suspension bolt nut
