These robust steel castle nuts, sized at 1-3/16 inch x 16 TPI, come in a convenient 2-piece set to meet your fastening needs. Castle nuts feature distinctive notches or slots cut into their top faces, allowing for cotter pin insertion to prevent loosening in high-vibration applications. The 1-3/16 inch size and 16 threads per inch specification ensure precise fitting for matching threaded components. Commonly used in automotive, machinery, and heavy equipment applications where secure fastening is critical, these castle nuts provide reliable mechanical locking capabilities. The durable steel construction offers excellent strength and load-bearing capacity, making them suitable for demanding industrial and mechanical applications. The castellated design enables positive locking while allowing for precise torque adjustments, ensuring components stay securely fastened under dynamic loads.