S-91268A217 1 1/4"-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 load-bearing capacity with 150,000 PSI tensile strength for reliable performance in high-stress industrial applications
• Superior wear resistance thanks to Rockwell C33 hardness, ensuring long service life under demanding conditions
• Optimized for quick assembly with UNC coarse thread spacing and Class 2A thread fit for faster installation and reduced cross-threading risk
• Maximum grip and engagement through fully threaded design, providing consistent clamping force along the entire 3 1/2" length
• Secure torque transmission with external hex drive and substantial 1 7/8" head width for reliable tool engagement
• Industry-standard compatibility meeting ASME B18.2.1 and SAE J429 specifications for seamless integration into existing systems
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance for sustainable procurement

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The steel construction with Rockwell C33 hardness provides exceptional resistance to vibration loosening and mechanical stress, addressing common failure points in dynamic load environments. The 1 1/4"-7 UNC coarse thread design ensures rapid installation in thick materials while maintaining Class 2A thread fit precision for consistent clamping performance. The fully threaded configuration offers versatile positioning options, making it ideal for applications requiring adjustable engagement depth. With external hex drive and substantial head dimensions, these heavy-duty hex bolts accommodate high torque applications without stripping, providing reliable fastening in construction, manufacturing, and equipment maintenance scenarios where 150,000 PSI tensile strength is non-negotiable.

Specification Summary & Compliance

This Grade 8 hex head screw features precision Class 2A thread fit with 1 1/4"-7 UNC coarse thread spacing and right-hand threading. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, it ensures dimensional accuracy and mechanical performance consistency. The fastener maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial applications requiring restricted substance control.