S-91253A224 8-36 x 1" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Exceptional mechanical strength with 130,000 psi tensile rating and Rockwell C39 hardness for high-stress applications
• Precision Class 3A thread fit ensures secure, vibration-resistant connections in critical assemblies
• Optimized flush mounting with 82° countersink angle and standard flat head profile for seamless surface integration
• Enhanced torque transmission through 3/32" hex drive design, preventing tool slippage during installation
• Full threading along 1" length provides maximum grip and load distribution across the entire fastener
• Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws deliver critical performance advantages in precision engineering applications where surface flushness and high clamping force are paramount. The UNF fine thread configuration with Class 3A fit maintains tight tolerances in vibration-prone equipment, while the hex drive compatibility ensures reliable installation in confined spaces. The combination of 130,000 psi tensile strength and fully threaded design provides exceptional resistance to loosening under dynamic loads, making these fasteners ideal for aerospace components, industrial machinery, and automotive assemblies requiring high-strength fastening solutions with regulatory compliance.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNF fine thread specifications. Complies with ASTM F835 manufacturing requirements and maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 82° countersink angle and standard flat head profile ensure proper seating in matched countersunk holes.