S-91255A376 5/16"-24 x 3/8" 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
• Precise Class 3A thread fit ensures secure fastening with minimal vibration loosening in critical assemblies
• Exceptional 120,000 psi tensile strength provides reliable performance under high-stress conditions
• Rockwell C39 hardness rating delivers excellent wear resistance and durability
• 3/16" hex drive design allows for high-torque installation with standard tools
• Fully threaded construction enables maximum grip length and uniform load distribution
• Rounded button head profile offers a finished appearance while reducing snag hazards

Professional Applications & Engineering Value

Engineered for precision applications requiring high-strength fastening solutions, these Black-Oxide Alloy Steel Rounded Head Hex Screws address critical industrial challenges. The 5/16"-24 UNF fine thread configuration provides superior resistance to vibration loosening in machinery, automotive, and equipment manufacturing. The Class 3A thread fit ensures precise engagement with mating components, while the fully threaded design maximizes clamping force across the entire fastener length. The combination of 120,000 psi tensile strength and Rockwell C39 hardness makes these screws ideal for applications subject to dynamic loads and harsh operating conditions, providing long-term reliability where fastener failure is not an option.

Specification Summary & Compliance

This 5/16"-24 UNF Class 3A screw features precise fine thread spacing with diameter of 0.313" and 3/8" length. Manufactured to ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance consistency. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial use.