S-91255A841 3/8"-24 x 7/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress applications.
• Precision Class 3A UNF fine threading provides a secure, vibration-resistant fit for critical assemblies.
• High Rockwell C39 hardness offers excellent wear resistance and durability over repeated use.
• 7/32" hex drive design allows for easy installation and high torque application with standard tools.
• Full threading along the 7/8" length maximizes grip and load distribution across the entire fastener.
• Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability.

Professional Applications & Engineering Value

Engineered for precision and reliability, these Black-Oxide Alloy Steel Rounded Head Screws address common industrial challenges such as vibration loosening and corrosion-induced failure. The UNF Class 3A fine thread ensures tight tolerances and superior clamping force in machinery, automotive, and aerospace assemblies where high-strength fasteners are critical. The button head style with a rounded profile reduces stress concentration and provides a flush finish, ideal for applications requiring a smooth surface. Combined with the hex drive for secure tool engagement, these screws deliver consistent performance in heavy-duty and precision equipment, enhancing assembly integrity and reducing maintenance downtime.

Specification Summary & Compliance

This screw features a 3/8"-24 UNF fine thread with Class 3A fit for high precision, a length of 7/8", and is fully threaded. It complies with ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance consistency. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety standards for industrial use.