S-91301A037 7/8"-9 x 7/16" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to the Black-Oxide surface treatment, extending service life in demanding environments.
• Exceptional mechanical strength and wear resistance provided by the Alloy Steel construction and Rockwell C45 hardness.
• Precise and reliable fit ensured by the Class 3A thread fit, minimizing the risk of loosening under vibration.
• High-torque installation capability with the 1/2" Hex Drive, allowing for secure and easy assembly with standard tools.
• Space-saving headless design ideal for applications where a flush or unobtrusive finish is required.
• Wide industrial compatibility due to the standard 7/8"-9 UNC coarse thread, facilitating easy sourcing and replacement.
• Compliance with major environmental regulations (RoHS 3 & REACH), ensuring suitability for global supply chains.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel set screw is engineered to solve critical fastening challenges in industrial machinery, automotive assemblies, and heavy-duty equipment. The headless design with a 1/2" hex drive provides a flush mounting solution for pulleys, gears, and collars, preventing interference in compact spaces. Its Class 3A UNC coarse thread and high Rockwell C45 hardness ensure a vibration-resistant, durable lock that maintains clamping force under extreme loads and stress. The Black-Oxide finish adds a layer of protection against rust and corrosion, making it a reliable choice for applications exposed to oils, moisture, and varying temperatures, thereby reducing maintenance downtime and increasing the longevity of the assembly.

Specification Summary & Compliance

This set screw adheres to the Unified Coarse (UNC) thread standard with a precise Class 3A thread fit for superior dimensional accuracy. Manufactured from high-strength Alloy Steel and heat-treated to a Rockwell C45 hardness, it meets rigorous mechanical performance requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industrial markets.