S-91263A142 8-32 x 1 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated alloy steel construction for long-lasting performance in harsh industrial environments
• Superior holding power with 130,000 psi tensile strength and Rockwell C39 hardness for reliable fastening in demanding applications
• Precise flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Optimized thread engagement with Class 3A thread fit and partial threading for secure connections without unnecessary material usage
• Easy installation and removal with hex drive design requiring only 3/32" tool for efficient maintenance operations
• Industry-standard compatibility with UNC coarse threads and 8-32 size ensuring broad application across equipment and machinery
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

These 8-32 UNC flat head screws deliver critical engineering solutions where flush surface mounting and high-strength fastening are paramount. The zinc-plated alloy steel construction provides essential corrosion resistance for industrial equipment, machinery assemblies, and outdoor applications exposed to environmental elements. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of cross-threading while maintaining vibration resistance. With 130,000 psi tensile strength and Rockwell C39 hardness, these screws withstand substantial mechanical stress in heavy-duty applications. The partial threading design optimizes clamping force distribution, making them ideal for materials where full threading would compromise structural integrity. The standardized 82° countersink angle facilitates perfect flush installation in predrilled holes, essential for applications requiring smooth surfaces and aerodynamic profiles.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit tolerance for superior engagement. Thread specifications conform to UNC coarse thread standards with 8-32 size designation. Compliant with ASME B18.3 and ASTM F835 manufacturing specifications ensuring consistent quality and performance. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for restricted substance control. The zinc-plated alloy steel construction provides both corrosion resistance and mechanical strength meeting industrial fastener requirements.