S-91255A710 1/2"-13 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 tensile strength rated at 120,000 psi ensures reliable performance under heavy loads and vibration
• Precision Class 3A thread fit provides secure fastening with minimal play and consistent engagement
• Hex drive design with 5/16" drive size enables high-torque installation without stripping or cam-out
• Fully threaded construction offers maximum grip length and uniform stress distribution
• Rockwell C39 hardness maintains thread integrity and prevents deformation during installation
• Compliant with multiple standards including ASME B18.3 and ASTM F835 for guaranteed quality and interchangeability

Professional Applications & Engineering Value

These black-oxide alloy steel button head screws deliver critical performance advantages in demanding applications where corrosion resistance and structural integrity are paramount. The 1/2"-13 UNC coarse threads with Class 3A fit provide rapid installation and superior holding power in machinery, structural frameworks, and heavy equipment assemblies. The rounded button head profile with hex drive combines aesthetic appeal with practical installation benefits, creating flush surfaces while accommodating high torque requirements. Engineered for industrial environments, these fully threaded screws distribute clamping force evenly, preventing joint failure in vibration-prone applications. The combination of 120,000 psi tensile strength and Rockwell C39 hardness ensures these fasteners maintain their mechanical properties under sustained load conditions, making them ideal for critical connections in manufacturing equipment, transportation systems, and construction machinery.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 3A thread fit and UNC coarse thread specifications. Complies with ASME B18.3 for dimensional consistency and ASTM F835 for mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for hazardous substance restrictions. The black-oxide surface treatment provides additional corrosion protection while maintaining the alloy steel's inherent strength characteristics.