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THIS NUT IS 5/8" X 20 T.P.I. AND FITS ALL NORTON GEARBOX MAINSHAFTS. IT IS IDENTICAL TO THE STANDARD NUT 040373 APART FROM ITS LENGTH (STANDARD IS 3/8" - 9.5MM) AND MATERIAL 040373MC IS STAINLESS STEEL STANDARD IS PLAIN STEEL. 040373MC IS USED ON OUR COMMANDO MAINSHAFT OIL SEAL KIT.
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