VKQ Steel Castle Nut set, featuring two precision-engineered 1-3/16 inch x 16 TPI nuts designed for secure fastening applications. These castle nuts, also known as slotted nuts, feature distinctive notches or slots cut into their upper face, allowing for cotter pin insertion to prevent loosening in high-vibration environments. Crafted from durable steel, these nuts offer excellent strength and reliability for mechanical assemblies. The 1-3/16 inch internal diameter combined with 16 threads per inch (TPI) provides a precise fit for matching threaded components. The castellated design makes these nuts ideal for axle nuts, spindle nuts, and other applications where secure locking is critical. Their robust construction ensures consistent performance in demanding mechanical applications where regular nuts might not suffice. Perfect for automotive, machinery, and heavy equipment maintenance or repair work.