S-91255A817 12-24 x 3/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for extended service life in harsh industrial environments
• Superior thread engagement with Class 3A fit ensures reliable fastening and vibration resistance
• High tensile strength rating of 120,000 psi provides dependable performance under heavy loads
• Optimized hex drive design (9/64") enables secure tool engagement and reduced cam-out risk
• Full threading capability allows for maximum adjustability and consistent clamping force
• Rockwell C39 hardness maintains structural integrity and prevents thread deformation
• Comprehensive compliance with ASME B18.3, ASTM F835, RoHS 3, and REACH standards

Professional Applications & Engineering Value

These black-oxide alloy steel screws with 12-24 UNC coarse threading deliver critical performance advantages in demanding industrial applications. The combination of Class 3A thread fit and fully threaded design ensures superior vibration resistance and consistent clamping force in machinery assembly, automotive components, and heavy equipment. The rounded button head profile with hex drive provides flush mounting where clearance is limited while maintaining high torque capability. Engineered for reliability, these screws prevent galvanic corrosion and maintain structural integrity in environments where temperature fluctuations and mechanical stress are common challenges.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread spacing for optimal engagement. Complies with ASME B18.3 and ASTM F835 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features right-hand threading and standard rounded head profile with consistent 0.41" head diameter and 3/4" length for uniform application across industrial fastening systems.