S-91375A128 5-40 x 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for secure, vibration-resistant fastening in demanding applications
• Superior corrosion resistance provided by the black-oxide coating on alloy steel, extending service life in harsh industrial environments
• High-strength durability with Rockwell C45 hardness, ensuring reliable performance under heavy loads and repeated use
• Easy installation and removal using the 1/16" hex drive, allowing for efficient maintenance and adjustments
• Secure component positioning with the cup tip design, preventing slippage and providing positive engagement with mating surfaces
• Wide compatibility with 5-40 UNC coarse threads, making it suitable for various industrial assemblies and equipment
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for safe, environmentally responsible use

Professional Applications & Engineering Value

This 5-40 UNC set screw is engineered to address critical challenges in industrial fastening, where vibration resistance and long-term reliability are paramount. The black-oxide alloy steel construction, combined with Rockwell C45 hardness, provides exceptional strength and wear resistance, preventing loosening in high-stress applications such as machinery, automotive components, and precision equipment. The headless design and hex drive allow for flush mounting and easy access in confined spaces, while the Class 3A thread fit ensures precise engagement with mating parts, reducing the risk of thread stripping. Ideal for securing gears, pulleys, and collars, this set screw delivers consistent performance in manufacturing, assembly, and maintenance operations, minimizing downtime and enhancing operational efficiency.

Specification Summary & Compliance

This set screw features a 5-40 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances and reliable thread engagement. It complies with ASME B18.3 manufacturing specifications, guaranteeing dimensional accuracy and performance consistency. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for industrial use.