S-91286A164 5/16"-18 x 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 Grade 8 classification and 150,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion protection through zinc-flake coating, extending service life in harsh industrial environments
• Optimized torque transmission with external hex drive design and 1/2" head width for secure installation and removal
• Enhanced thread engagement with Class 2A thread fit and coarse UNC threading, reducing cross-threading risks
• Versatile partial threading allowing unthreaded shank sections for precise clamping and shear resistance
• Consistent hardness performance at Rockwell C33, maintaining structural integrity under repeated stress
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards while being RoHS 3 and REACH compliant

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The zinc-flake coated steel construction provides exceptional corrosion resistance, making them ideal for outdoor equipment, automotive assemblies, and machinery exposed to environmental challenges. The 5/16"-18 UNC coarse thread configuration ensures rapid installation and superior vibration resistance, while the partially threaded design allows for precise unthreaded shank placement in shear-critical applications. With external hex drive and substantial head dimensions, these fasteners accommodate high torque requirements without stripping, solving common installation challenges in structural steel connections, heavy machinery, and transportation equipment where reliability and durability are paramount.

Specification Summary & Compliance

This 2" length hex head screw features precise Class 2A thread fit with 5/16"-18 UNC coarse threading and minimum thread length of 7/8". Manufactured to ASME B18.2.1 and SAE J429 specifications, the fastener maintains dimensional accuracy and performance consistency. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety, while the Rockwell C33 hardness and 150,000 psi tensile strength guarantee mechanical reliability across demanding industrial applications.