This high-quality lock nut is designed to fit Cummins engines K19, K38, K50, N14, and NT855. Made from durable materials, it provides reliable fastening for your equipment. Whether you're in the industrial or personal use industry, this lock nut is a must-have for your toolkit. It's perfect for use in hex nut applications, and its compatibility with fastener nuts makes it a versatile choice for a variety of projects.