Precision-engineered from high-strength Aluminum 7075-T6, this black castle nut features a 1-3/16 inch diameter with 16 threads per inch (TPI). The distinctive castellated design allows for secure locking with a cotter pin, making it ideal for critical applications where vibration resistance is essential. The lightweight yet durable aluminum construction offers excellent strength-to-weight ratio while resisting corrosion. The black finish adds a sleek, professional appearance while providing additional surface protection. This castle nut is perfect for automotive, machinery, and heavy equipment applications where reliable fastening is crucial. The 16 TPI threading ensures smooth installation and proper load distribution. Please verify compatibility with your specific application before purchase.