S-91268A673 1/2"-13 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 wear resistance due to Rockwell C33 hardness, ensuring extended service life in demanding environments
• Secure fastening with coarse UNC threads that provide excellent grip and reduce the risk of loosening under vibration
• Easy installation and removal with external hex drive design, compatible with standard tools for efficient maintenance
• Precision-engineered Class 2A thread fit for consistent engagement and reduced cross-threading issues
• Environmental compliance assurance with RoHS 3 and REACH regulations, making them safe for various industrial sectors
• Versatile partial threading allowing for adjustable clamping force in structural and machinery assemblies

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver unmatched reliability in construction, machinery, and automotive sectors. The 1/2"-13 UNC coarse thread design ensures rapid installation and robust holding power, while the partially threaded shank concentrates strength where needed most. Made from high-grade steel and compliant with ASME B18.2.1, they address common challenges like joint failure, vibration-induced loosening, and corrosion. Ideal for structural connections and high-torque assemblies, these screws provide long-term durability and reduce maintenance downtime.

Specification Summary & Compliance

This 5 1/2" length hex head screw features a 1/2"-13 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 8 standards, it ensures consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity.