The Euclid 3-1/4"-12 Thread Spindle Nut is designed to provide a secure fit for your hub assembly. This nut is heat treated for increased structural strength and durability, making it ideal for use in a variety of applications. The hex size is 3-3/16" and the I.D. is 2-5/8". This nut is designed for easier installation and maintenance and does not require special tools. It helps maximize tire life and reduce maintenance downtime, making it a great choice for any vehicle. With its superior strength and durability, it is the perfect choice for your hub assembly. FleetPride is your First Click in Heavy Duty®.