S-91306A290 5/16"-24 x 3/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated alloy steel construction for reliable performance in demanding industrial environments
• Superior thread engagement and vibration resistance through Class 3A thread fit and UNF fine thread design
• High-strength fastening capability with 120,000 PSI tensile strength and Rockwell C39 hardness for heavy-duty applications
• Easy installation and removal with 3/16" hex drive design providing secure tool engagement
• Complete thread coverage with fully threaded design ensuring maximum holding power across the entire fastener length
• Low-profile rounded head design offering clean appearance while maintaining structural integrity
• Regulatory compliance assurance meeting ASME, ASTM, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

Engineered for precision applications requiring high tensile strength and reliable thread engagement, these 5/16"-24 UNF Class 3A zinc-plated alloy steel screws deliver exceptional performance in industrial settings. The fine thread spacing provides superior resistance to vibration loosening, making them ideal for machinery, equipment assembly, and automotive applications where secure fastening is critical. The rounded head design with hex drive combines aesthetic appeal with practical installation benefits, while the zinc plating offers essential corrosion protection in moderate environments. These fully threaded screws ensure maximum load distribution and holding power, solving common engineering challenges related to joint integrity and long-term reliability in industrial fastening systems.

Specification Summary & Compliance

This rounded head screw features precision Class 3A thread fit with 5/16"-24 UNF fine threading and right-hand thread direction. Manufactured to exacting standards including ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting current industry requirements for hazardous substance restrictions and chemical safety standards.