The 83 133 SLO54 AR14.75 part is a type of fastener manufactured by Promet. It is a self-locking nut which consists of a slotted, hexagonal shaped body with an all-metal construction. It features a 3/4 inch diameter and a .75 inch long thread. The nut is designed to provide a secure fit even with changes in temperature, vibration and tension. The nut is rated for up to 150 pounds of torque and is commonly used in industrial and automotive applications.