Alamo 02981702 slotted nut, 1-1/2. Also known as a castle nut (castellated nut).
Used on select Alamo boom mower assemblies, including Axtreme, Axtreme2, Maverick, Samurai, Machete Boom 2, and Versa 2 models. Commonly shown in Boom Assembly and Under Mount Frame Assembly parts diagrams (including mainframe/turning arm assembly).
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