Fits AYP models PP 18 HP, 44" & 9540052-61 with star shape blade hole assemblies. Mounting bolt for #251-0678 & #251-0641 blade assemblies. Hex head, used to mount all non-threaded AYP spindles.
Replaces AYP #(s) 138776, 157722, 173984, 532173984, 584953901; Husqvarana #(s) 532 13 87-76, 532 15 77-22, 532 17 39-84, 584 95 39-01.
•Thread: 5/16"-18
•Thread Length: 1-1/4"