Secure your fasteners with ease using this Locking Cap Nut. Designed for 5/16-18 threaded connections, it ensures a reliable hold in place. With a sleek black finish and a durable construction, this nut not only provides a professional look but also offers long-lasting performance. Made of high-quality nylon, it boasts excellent resistance to wear and tear, making it ideal for various applications. The .530-inch height adds versatility, fitting into tight spaces with ease. Upgrade your fastening solution with this essential component.