S-91268A226 1 1/4"-7 x 7" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
• Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life
• Optimized thread engagement through 1 1/4"-7 UNC coarse threading for faster assembly in tough materials
• Precise mechanical fit with Class 2A thread tolerance for consistent performance and vibration resistance
• Enhanced torque transmission via external hex drive design for secure fastening in high-stress environments
• Material efficiency through partial threading that concentrates strength where needed most
• Regulatory compliance assurance meeting both performance standards and environmental regulations

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver exceptional engineering value in demanding industrial environments where failure is not an option. The steel construction combined with 150,000 psi tensile strength provides critical reliability for heavy machinery, structural frameworks, and equipment subjected to extreme vibrational loads. The 1 1/4"-7 UNC coarse thread configuration ensures rapid installation in thick materials while maintaining superior pull-out resistance. With partial threading and external hex drive, these fasteners offer optimal clamp load distribution and accessibility in confined spaces. The right-hand thread direction provides standardized installation compatibility across industrial maintenance and manufacturing applications, making them ideal for replacement parts in existing systems or new equipment assembly where proven performance is paramount.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances for consistent mechanical performance, these hex head screws conform to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements. The 1 1/4"-7 UNC coarse thread maintains standard industrial compatibility while the 7" length with 3" minimum thread length provides versatile application coverage. Environmental compliance is assured through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) adherence, meeting the latest regulatory standards for industrial components.