S-91255A049 7/16"-20 x 1" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress applications
• Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
• Optimized torque transmission through 1/4" hex drive design for secure installation and removal
• Enhanced durability with Rockwell C39 hardness maintaining structural integrity through repeated use
• Streamlined assembly with fully threaded design and fine thread spacing for superior holding power
• Regulatory compliance meeting industry standards for quality assurance and environmental safety

Professional Applications & Engineering Value

These black-oxide alloy steel rounded head screws deliver exceptional engineering value in industrial applications where vibration resistance and corrosion protection are critical. The Class 3A UNF fine threading ensures precise fitment in machinery, automotive, and heavy equipment assemblies, preventing loosening under dynamic loads. The 1/4" hex drive configuration allows for high-torque installation without stripping, while the button head profile provides a low-profile finish that reduces snagging hazards. Engineered to withstand harsh operating conditions, these fully threaded screws maintain their 120,000 psi tensile strength in high-stress applications, offering reliable fastening solutions for OEM and MRO requirements across multiple industries.

Specification Summary & Compliance

This 7/16"-20 UNF screw features precision Class 3A thread fit with fine thread spacing for superior engagement. Manufactured 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 safety and sustainability. The black-oxide alloy steel construction maintains consistent mechanical properties across all critical dimensions including head diameter, drive size, and thread specifications.