S-91268A927 1"-8 x 3 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 a tensile strength of 150,000 psi, these screws provide reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Durability & Wear Resistance: Rockwell C33 hardness ensures long-lasting performance and resistance to deformation under heavy loads.
• Optimized for Quick Installation: Coarse UNC threading and Class 2A fit allow for faster assembly and secure fastening in various materials.
• Enhanced Grip & Torque Application: The external hex drive and 1 1/2" head width offer excellent tool engagement, minimizing slippage during installation.
• Reliable in Demanding Environments: Made from high-strength steel, these screws maintain integrity in industrial settings with vibration and dynamic loads.
• Versatile Fastening Solution: Partially threaded design provides a strong grip where full threading isn't needed, ideal for structural and machinery applications.
• Compliance with Industry Standards: Meets ASME B18.2.1 and SAE J429 specifications, ensuring consistency and interoperability in professional use.

Professional Applications & Engineering Value

Engineered for rigorous industrial demands, these Grade 8 hex head screws deliver exceptional performance in heavy machinery, construction, and automotive assemblies. The 1"-8 UNC coarse thread with Class 2A fit ensures rapid installation and robust clamping force, reducing assembly time while preventing loosening under vibration. Constructed from high-strength steel and heat-treated to Rockwell C33 hardness, they resist wear and fatigue in high-load scenarios. The partially threaded design allows for precise load distribution, making them ideal for bolting flanges, brackets, and structural frames where reliability is critical. Compliant with ASME B18.2.1 and other standards, these screws offer peace of mind for engineers requiring consistent, high-performance fasteners in demanding applications.

Specification Summary & Compliance

This screw features a 1"-8 UNC coarse thread with Class 2A dimensional accuracy, ensuring proper fit and function. It adheres to manufacturing specifications per ASME B18.2.1 and SAE J429, guaranteeing uniformity and reliability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental and safety standards are met, supporting sustainable industrial practices.