S-91268A990 1"-8 x 6 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 under demanding conditions
• Optimized thread engagement with Class 2A UNC coarse threads providing secure fastening and reduced cross-threading risk
• Enhanced installation efficiency through external hex drive design allowing high torque application with standard tools
• Strategic partial threading enabling precise clamp load distribution and vibration resistance in structural connections
• Rigorous quality assurance meeting ASME B18.2.1 and SAE J429 specifications for consistent dimensional accuracy
• Environmental compliance with RoHS 3 and REACH regulations ensuring safe usage across global industrial markets

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical reliability in construction machinery, structural steel connections, and high-vibration equipment. The 1"-8 UNC coarse thread configuration ensures rapid assembly while maintaining superior clamping force, particularly beneficial in steel-to-steel fastening scenarios where joint integrity is paramount. The partially threaded design concentrates strength at the shear plane, preventing thread damage during repeated disassembly. With external hex drive compatibility, installers achieve precise torque control using standard industrial tools, reducing installation time and improving worksite efficiency. These screws consistently perform in demanding environments where 150,000 psi tensile strength and Rockwell C33 hardness are required to withstand extreme mechanical stresses and prevent premature fastener failure.

Specification Summary & Compliance

This 6 1/2" length fastener features Class 2A thread fit per UNC standards, ensuring precise dimensional tolerances for consistent performance. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications governing dimensional requirements and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) regulations regarding chemical substance management, making it suitable for global industrial distribution and environmentally conscious procurement programs.