S-91375A191 8-32 x 5/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional Vibration Resistance: The Class 3A thread fit ensures a precise, tight engagement that minimizes loosening under dynamic loads, providing reliable, long-term fastening.
• Superior Durability and Corrosion Protection: Made from Black-Oxide Alloy Steel, this screw offers enhanced resistance to wear and a protective layer against rust in demanding industrial environments.
• High-Strength Fastening: With a Rockwell C45 hardness, the set screw maintains its structural integrity and clamping force, even under high-stress applications.
• Secure and Flush Installation: The headless, cup tip design allows the screw to sit flush against surfaces, preventing snagging and ensuring a positive, non-slip grip on the shaft or component.
• Optimized for Efficient Assembly: The coarse UNC thread and 5/64" hex drive enable quick installation and high torque application, reducing assembly time and labor costs.
• Guaranteed Quality and Consistency: Manufactured to meet ASME B18.3 specifications, ensuring dimensional accuracy and reliable performance batch after batch.
• Safe for Global Use: Compliant with RoHS 3 and REACH regulations, making it suitable for international supply chains and environmentally conscious manufacturing.

Professional Applications & Engineering Value

This 8-32 UNC set screw is engineered to solve critical challenges in precision assembly and motion control systems. The Black-Oxide Alloy Steel construction provides the necessary hardness and corrosion resistance for components exposed to friction and harsh operational conditions. Its headless design with a cup tip is ideal for securing collars, gears, and pulleys onto shafts, applying concentrated pressure to prevent axial movement without damaging the shaft surface. The Class 3A thread fit and coarse thread spacing ensure a robust hold that resists vibrational loosening in machinery, automotive, and aerospace applications. By integrating a standard 5/64" hex drive, it facilitates easy installation in confined spaces, enhancing maintenance efficiency and reducing downtime in industrial set screw applications.

Specification Summary & Compliance

This set screw adheres to strict dimensional and performance standards, including a Class 3A thread fit for superior tolerance and a UNC coarse thread profile. It is manufactured in compliance with the ASME B18.3 specification, ensuring consistency and reliability. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting global environmental and safety regulations for hazardous substances.