S-91255A592 5/16"-18 x 2 1/2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional durability with 120,000 psi tensile strength and Rockwell C39 hardness for reliable performance in demanding industrial environments
• Precision fastening ensured by Class 3A thread fit and fully threaded UNC coarse spacing for secure, vibration-resistant connections
• Superior corrosion resistance through black-oxide coating on alloy steel, extending service life in harsh conditions
• Easy installation and removal with hex drive design and 3/16" drive size for efficient tool engagement
• Space-saving button head profile providing a low-profile finish while maintaining strong clamping force
• Right-hand threading compatibility with standard UNC 5/16"-18 specifications for broad application versatility
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these black-oxide alloy steel button head screws deliver exceptional performance where vibration resistance and structural integrity are critical. The fully threaded UNC coarse spacing provides superior holding power in metal assemblies, machinery, and equipment frames, while the Class 3A thread fit ensures precise engagement without cross-threading risks. The rounded head design with hex drive offers both aesthetic appeal and practical installation advantages in confined spaces. Ideal for automotive, manufacturing, and construction applications requiring high tensile strength fasteners that withstand extreme mechanical stresses while maintaining compliance with international standards.

Specification Summary & Compliance

This 5/16"-18 x 2-1/2" button head screw features precision UNC coarse threads with Class 3A fit for optimal engagement tolerance. Manufactured according to ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for hazardous substance restrictions and chemical safety protocols.