S-91253A061 1-72 x 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding industrial environments
• Exceptional mechanical strength with 130,000 psi tensile strength and Rockwell C39 hardness for reliable performance under high stress
• Precise thread engagement with Class 3A fit and UNF fine threads ensuring secure fastening in precision applications
• Optimized head design featuring 82° countersink angle and flat head profile for flush mounting and improved load distribution
• Efficient installation with hex drive design providing superior torque transmission and reduced tool slippage
• Full threading capability allowing complete engagement along the entire 1/2" length for maximum holding power
• Regulatory compliance meeting ASTM F835 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 1-72 UNF flat head screws with hex drive configuration deliver critical performance in precision assembly applications where space constraints and reliability are paramount. The black-oxide alloy steel construction provides excellent corrosion protection while maintaining the material's inherent strength characteristics. The Class 3A thread fit ensures tight tolerances for vibration-resistant connections in machinery, electronic enclosures, and precision instruments. The 82° countersink angle allows for flush mounting in tapered recesses, preventing protrusion issues in compact designs. With fine thread spacing, these screws offer superior resistance to loosening under dynamic loads, making them ideal for applications requiring repeated adjustments or exposure to vibration. The combination of fully threaded design and high tensile strength addresses common failure points in industrial fastening systems.

Specification Summary & Compliance

This 1-72 UNF flat head screw features precision Class 3A thread fit with right-hand thread direction and fine thread spacing. Manufacturing complies with ASTM F835 specifications, ensuring consistent quality and performance. The product meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards, making it suitable for global industrial applications. Dimensional accuracy is maintained with standard 82° countersink angle and 0.050" hex drive size for reliable installation across various applications.