Pinion shaft nut BTl81-89 3/4"-20

These USA made nuts now give the ultimate in flywheel holding power. The mating face of each nut has been ground to a 32 surface finish and held square to threads within .0005". This in turn will pull the shafts straight into the flywheels and simplify flywheel turning. But it did not stop there, each nut is machined on state of the art CNC lathes and heat treated to make these nuts the toughest and the best available on the market today.