S-98637A533 1/4"-28 x 5/16" MS51964-65 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with precision UNF fine threading and Class 3A fit for minimal backlash and reliable performance in high-vibration environments.
• Exceptional durability and corrosion resistance thanks to cadmium-plated alloy steel construction and Rockwell C45 hardness, ensuring long service life.
• Secure, non-slip installation with the 1/8" hex drive, allowing for high torque application without damaging the fastener.
• Maximum grip and minimal component damage from the cup point design, which bites securely into the shaft without excessive marring.
• Space-saving headless design for applications where a flush or low-profile finish is critical.
• Guaranteed reliability and interchangeability by meeting MS51964-65 specifications, ensuring consistent quality for industrial use.
• Optimized for fine-adjustment applications with the right-hand fine thread, providing precise positioning and clamping force.

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A cup point set screw is engineered to solve critical challenges in industrial assembly and precision machinery. The cadmium-plated alloy steel provides excellent corrosion resistance, extending the component's life in harsh environments. Its fine UNF threading and Class 3A fit deliver superior clamping force and vibration resistance, preventing loosening in dynamic applications like motor shafts, gears, and pulleys. The cup point design ensures a firm bite into materials without causing excessive stress concentration, making it ideal for securing collars and knobs where repositioning might be needed. This combination of high strength, precise thread fit, and durable surface treatment makes it a trusted precision fastener for aerospace, automotive, and heavy equipment industries requiring reliable, repeatable performance.

Specification Summary & Compliance

This set screw adheres to Class 3A thread fit for high precision and tight tolerances. It conforms to MS51964-65 specifications, ensuring manufacturing consistency and reliability. The UNF fine thread with a 1/4"-28 size and right-hand direction is standardized for compatibility. The cadmium plating offers corrosion protection, and the material meets common industrial standards for performance. It is designed to be compliant with relevant industry requirements for quality and safety in industrial set screw applications.