S-91286A337 1/2"-13 x 3" 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 heavy-duty applications requiring maximum reliability
• Superior corrosion resistance through zinc-flake coating that provides long-lasting protection in harsh industrial environments
• Optimized torque transmission with external hex drive design ensuring secure installation and removal with standard tools
• Enhanced thread engagement through UNC coarse threading that resists vibration loosening and simplifies alignment
• Precision manufacturing with Class 2A thread fit ensuring consistent performance and compatibility with standard nuts
• Reduced weight without compromising strength through partial threading design that maintains structural integrity
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interoperability

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance in demanding industrial settings where failure is not an option. The zinc-flake coated steel construction provides superior corrosion resistance that outperforms conventional platings, making them ideal for outdoor equipment, machinery frames, and structural assemblies exposed to environmental stressors. The UNC coarse threading ensures rapid installation and maintains grip under vibration, while the external hex drive allows for high-torque applications without stripping. With Rockwell C33 hardness and 150,000 psi tensile strength, these partially threaded screws provide the perfect balance of strength and weight efficiency for construction, manufacturing, and heavy equipment applications where every fastener must perform under extreme loads.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances with 1/2"-13 UNC coarse threading and 3" length. These hex head screws conform to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring verified material safety and sustainability standards.