S-91286A232 3/8"-16 x 5 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 PSI tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
• Optimized torque transmission through external hex drive design for secure installation and removal
• Enhanced thread engagement with Class 2A thread fit ensuring precise assembly and vibration resistance
• Reduced weight and material usage through partial threading while maintaining full structural integrity
• Maximum hardness durability with Rockwell C33 rating for wear resistance and repeated use capability
• Universal compatibility with coarse UNC threads for quick installation across standard industrial equipment

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical performance where failure is not an option. The steel construction combined with Rockwell C33 hardness provides exceptional resistance to shear forces and wear in machinery assembly, structural steel connections, and heavy equipment manufacturing. The zinc-flake coated finish offers superior corrosion protection compared to standard platings, significantly extending service life in outdoor or chemically aggressive environments. The partial threading design concentrates strength where needed most while reducing overall weight, making it ideal for applications requiring precise clamp load distribution. With 3/8"-16 UNC coarse threads and external hex drive, installation is streamlined for efficiency in high-volume assembly operations while maintaining the integrity of critical connections.

Specification Summary & Compliance

This 5-1/2" hex head screw features 3/8"-16 UNC coarse threads with Class 2A thread fit for precise dimensional accuracy and reliable assembly. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring consistent quality and performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications with strict chemical substance restrictions.