Jackshaft Nut / Murray 15x100MAPack Size:1Murray 15X100, Murray 15X100MAESF 192-326, Foley/PLP 192-326, NHC 274-6783, Prime Line 7-07462, Rotary 9329, Sunbelt AC-326Murray Splined jackshaftsThread: 9/16 "-18 UNF