S-91286A801 3/8"-16 x 2 3/8" 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 through zinc-flake coating that protects against harsh industrial environments
• Optimized torque transmission with external hex drive design ensuring secure installation and removal
• Enhanced thread engagement with Class 2A fit and coarse UNC threading for vibration resistance
• Grade 8 reliability meeting SAE J429 standards for consistent high-strength performance
• Versatile partial threading allowing for both clamping and alignment functions in assembly
• Regulatory compliance with RoHS 3 and REACH environmental standards for safe usage

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The steel construction with Rockwell C33 hardness provides the structural integrity needed for machinery, construction equipment, and automotive assemblies subjected to extreme loads and vibrations. The zinc-flake coating offers superior corrosion protection compared to conventional platings, significantly extending service life in challenging environments. The 3/8"-16 UNC coarse thread configuration ensures rapid installation and maintains grip strength even under dynamic loading conditions. With partial threading and external hex drive, these fasteners provide optimal clamping force distribution while allowing for precise torque application during assembly operations.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with UNC coarse threading (3/8"-16) and meets ASME B18.2.1 specifications where identified under SAE J429. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring regulatory compliance for industrial use across global markets. The fastener maintains dimensional accuracy with 2 3/8" length and 1" minimum thread length for consistent performance in demanding applications.