James Transmission Seal Nut (Super Nut) for Harley-Davidson

The Super Nut is a mainshaft nut originally designed by James that has a solid reputation dating back several decades.
The added benefit? This mainshaft nut, with a built-in replaceable seal, will help keep transmission oil where it belongs... inside.
Note: Due to the added height, it may interfere with some mainshaft supports or internal primary cases.
Note: See 518760 for replacement James seal and 517165 for replacement locking tab washer.

Compatible with: > 36-86 4-speed BT.