S-91375A896 5/16"-18 x 1" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit for tighter, more secure assemblies that resist loosening under vibration
• Exceptional durability and corrosion resistance provided by the zinc plating on alloy steel, extending service life in demanding environments
• High-strength performance backed by a Rockwell C45 hardness rating, ensuring the screw maintains its form under high torque and load
• Secure and flush installation thanks to the headless, cup tip design, which minimizes protrusion and provides positive seating
• Efficient installation and removal with the 5/32" hex drive, allowing for high torque application with standard tools
• Reliable thread engagement from the coarse UNC thread spacing, facilitating faster assembly and reducing cross-threading risks
• Broad industry compliance meeting ASME B18.3, RoHS 3, and REACH standards for quality, safety, and environmental responsibility

Professional Applications & Engineering Value

This 5/16"-18 UNC Class 3A set screw is engineered to solve critical challenges in industrial assembly and heavy-duty machinery. The zinc plated alloy steel construction combats corrosion, while the Rockwell C45 hardness ensures the hex drive and threads resist stripping and deformation under high stress. The headless design and cup tip provide a secure, flush fit in pulleys, gears, and collars, preventing component slippage and maintaining precise alignment. Its right-hand coarse thread enables quick installation, making it ideal for production lines where speed and reliability are paramount. By integrating high-strength materials with precision thread fit, this fastener delivers consistent clamping force and long-term performance in demanding mechanical systems.

Specification Summary & Compliance

This set screw features a 5/16"-18 UNC thread with a Class 3A fit for high precision and a coarse thread spacing. It is manufactured from alloy steel with a zinc plating finish and meets the dimensional and mechanical requirements of ASME B18.3. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted hazardous substances and safe for use in various industrial applications.