S-91253A249 10-24 x 1 1/4" 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
• Maximum thread engagement through full threading design, ensuring secure fastening across the entire length
• Precise flush mounting with 82° countersink angle and standard flat head profile for clean, professional installations
• High-torque capability with hex drive design, preventing stripping during installation in high-stress applications
• Exceptional mechanical strength with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Reliable thread performance with Class 3A fit and UNC coarse threads, providing superior vibration resistance
• Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

These 10-24 UNC flat head screws deliver exceptional engineering value in industrial applications where vibration resistance and flush mounting are critical. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the high tensile strength required for structural applications. The combination of Class 3A thread fit with coarse UNC threading ensures reliable performance in high-vibration environments, making them ideal for machinery, equipment assembly, and automotive applications. The hex drive style allows for high-torque installation without slippage, while the 82° countersink angle provides seamless integration into prepared surfaces. These fully threaded screws offer maximum grip length for secure fastening in demanding industrial settings where reliability is paramount.

Specification Summary & Compliance

These flat head screws feature precision Class 3A thread fit with UNC coarse thread spacing and right-hand threading. Manufacturing specifications comply with ASTM F835 standards for consistent quality and performance. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global industrial markets. The dimensional accuracy includes a head diameter of 0.411", length of 1-1/4", and drive size of 1/8" hex, providing reliable interchangeability and installation consistency.