S-91286A316 7/16"-20 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
• Superior corrosion resistance through zinc-flake coating that provides long-term protection in harsh industrial environments
• Precise thread engagement with Class 2A UNF fine threads ensuring reliable fastening and vibration resistance
• Optimized torque transmission via external hex drive design that prevents tool slippage during high-torque installation
• Enhanced durability from Rockwell C33 hardness that maintains fastener integrity under repeated stress
• Versatile partial threading allowing unthreaded shank sections to function as precision alignment pins
• Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed performance

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value through its zinc-flake coated steel construction, specifically engineered to solve common industrial fastening challenges. The 7/16"-20 UNF fine thread configuration provides superior resistance to vibrational loosening in heavy machinery, construction equipment, and automotive assemblies. The partially threaded design allows the unthreaded shank to bear shear loads directly, preventing thread damage in high-stress applications. With external hex drive compatibility, these screws enable high-torque installation without cam-out issues, making them ideal for maintenance operations and production line assembly where reliability is paramount. The combination of 150,000 psi tensile strength and corrosion-resistant coating ensures long-term performance in demanding environments where fastener failure is not an option.

Specification Summary & Compliance

This heavy-duty hex head screw features precision Class 2A thread fit with UNF fine threading (7/16"-20) and 5" length with minimum 1 1/8" thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications with strict chemical substance restrictions.