The NO.4UNC Lock Nut with Nylon Insert from Qualfast is designed to provide a secure fastening solution for various applications. This product range is crafted to ensure reliability and durability, making it ideal for use in environments where vibration and movement may compromise traditional nuts. The nylon insert enhances grip, preventing loosening over time, which contributes to the overall integrity of assembled components. With a focus on quality and performance, these lock nuts are suitable for both professional and DIY projects, ensuring peace of mind in every application. Features: Driving Features: Hexagon Thread Size: No.4 Material: Stainless Steel Grade: A4 Applications: - Ideal for securing bolts in high-vibration environments, preventing loosening over time. - Suitable for marine applications due to A4 stainless steel's resistance to corrosion in saltwater.