S-91306A338 8-32 x 5/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated alloy steel construction, extending service life in harsh industrial environments
• Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for reliable performance under heavy loads
• Precise thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Easy installation and removal with hex drive design providing positive torque transmission and reduced tool slippage
• Full threading coverage along the 5/8" length for maximum grip and uniform stress distribution
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for quality and environmental safety
• Versatile rounded head profile with standard button style offering clean appearance and reduced snagging in assembled applications

Professional Applications & Engineering Value

These zinc-plated alloy steel rounded head screws deliver critical performance advantages in demanding industrial settings where corrosion resistance and mechanical integrity are paramount. The combination of Class 3A thread fit with UNC coarse threading provides exceptional vibration resistance in machinery, electrical enclosures, and structural assemblies, preventing loosening under dynamic loads. The 120,000 psi tensile strength ensures reliable fastening in high-stress applications while the zinc plating creates a protective barrier against moisture, chemicals, and environmental degradation. The hex drive configuration enables efficient installation in confined spaces, reducing assembly time and improving productivity in manufacturing, automotive, and heavy equipment applications where durability and compliance with ASME B18.3 and ASTM F835 standards are essential.

Specification Summary & Compliance

This 8-32 UNC threaded screw features precise Class 3A thread fit tolerances with coarse thread spacing and right-hand thread direction. Manufacturing complies with ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming absence of restricted substances. With fully threaded 5/8" length, 0.312" head diameter, and 3/32" hex drive size, these screws maintain strict quality control for industrial fastener applications.