S-91268A117 1 1/8"-7 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 Tensile Strength: With a 150,000 PSI tensile rating, this screw provides superior resistance to breaking under extreme loads, ensuring reliable performance in high-stress industrial applications.
• High Hardness for Durability: Rockwell C33 hardness offers excellent wear and deformation resistance, extending the fastener's service life in demanding environments.
• Optimized Coarse Thread Design: The 1 1/8"-7 UNC coarse thread ensures quick installation and robust holding power, reducing the risk of stripping in softer materials.
• Full Threading for Maximum Engagement: Fully threaded along the 3 1/2" length allows for versatile positioning and enhanced grip across the entire fastener.
• Precision Thread Fit: Class 2A thread fit guarantees consistent, reliable assembly with standard nuts, minimizing play and improving joint integrity.
• Heavy-Duty Material Grade: Made from Grade 8 steel, this hex head screw delivers high strength and fatigue resistance, ideal for critical structural connections.
• External Hex Drive for Easy Torque Application: The external hex drive design facilitates straightforward installation with common tools, speeding up assembly processes.

Professional Applications & Engineering Value

This Grade 8 steel hex head screw is engineered to address the rigorous demands of heavy machinery, construction, and automotive assemblies where failure is not an option. Its 1 1/8"-7 UNC coarse thread and fully threaded design provide exceptional clamping force and vibration resistance, preventing loosening in dynamic environments. The external hex drive allows for high-torque installation, ensuring secure fastening in thick materials or high-load joints. By utilizing Grade 8 material with 150,000 PSI tensile strength and Rockwell C33 hardness, it solves common issues like shear failure and thread wear, making it a reliable choice for structural frameworks, equipment mounts, and other critical industrial applications that require long-term durability and safety compliance.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse thread specifications, ensuring compatibility and performance. It meets ASME B18.2.1 and SAE J429 manufacturing standards for consistency and reliability. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial sectors without hazardous substances.