S-91385A548 1/4"-20 x 2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking through the integrated Nylon Patch ensures your assemblies stay securely fastened even under dynamic loads.
• Exceptional environmental durability with a wide operating temperature range from -50°F to 250°F, making it suitable for both extreme cold and high-heat applications.
• Superior wear resistance and strength provided by the Black-Oxide Alloy Steel construction and Rockwell C45 hardness, extending the screw's service life.
• Precise and reliable engagement due to the UNC Coarse Thread with Class 3A fit, enabling easier assembly and a tighter, more consistent clamp.
• Secure, flush mounting in blind holes is achieved with the headless design and cup tip, preventing protrusion and providing excellent torque transmission.
• Streamlined maintenance and installation using a standard 1/8" hex drive, allowing for quick and easy servicing with common tools.
• Compliance and peace of mind by meeting ASME B18.3, ASTM F912, RoHS 3, and REACH standards, ensuring product safety and regulatory adherence.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel set screw is engineered to solve critical challenges in industrial and mechanical assemblies where vibration-induced loosening is a primary concern. The Nylon Patch thread locker provides a resilient, chemical-free locking mechanism that maintains clamp load without the mess of liquid adhesives, ideal for precision machinery, motor shafts, and gear assemblies. Its headless, cup-tip design ensures a flush fit, making it perfect for set-and-forget applications in collars and knobs where space is constrained. The UNC coarse thread and Class 3A fit offer superior thread engagement and ease of installation in a variety of materials, reducing the risk of cross-threading. Built from high-strength alloy steel with a protective black-oxide finish, it resists corrosion and wear, delivering long-term reliability in demanding environments from automotive to heavy equipment.

Specification Summary & Compliance

This set screw adheres to a Class 3A thread fit for high precision and consistent engagement. It conforms to ASME B18.3 and ASTM F912 specifications, ensuring dimensional accuracy and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for use in various industrial markets.