The Toro 713590 is an authentic OEM hex lock nut, designed to provide secure and reliable fastening for a wide range of Toro equipment. This durable steel nut, often featuring a nylon insert for locking, ensures components remain tightly secured under vibration and operational stress. It is a critical replacement part for maintaining the integrity and safety of your Toro lawn mowers, garden tractors, and utility vehicles, ensuring proper fitment and long-lasting performance.