S-91268A902 7/8"-9 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 applications
• Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
• Optimized thread engagement with 7/8"-9 UNC coarse threading and Class 2A fit for faster assembly and vibration resistance
• Secure installation enabled by external hex drive and 1 5/16" head width for high torque application
• Controlled thread placement through partial threading design for precise fastening in specific connection points
• Industry compliance assurance meeting ASME B18.2.1 and SAE J429 standards for consistent quality and interoperability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

This Grade 8 steel hex head screw delivers critical performance where structural integrity cannot be compromised. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness provides exceptional resistance to shear forces and material deformation in heavy machinery, construction equipment, and industrial framing applications. The 7/8"-9 UNC coarse threading with Class 2A fit ensures rapid installation while maintaining vibration resistance in high-load environments. The partially threaded design concentrates fastener strength precisely where needed, preventing thread damage in non-critical sections. With external hex drive compatibility, this fastener accommodates standard industrial tools for efficient maintenance and assembly operations across manufacturing, infrastructure, and transportation sectors.

Specification Summary & Compliance

This 3 1/2" length hex head screw features precise Class 2A thread fit tolerance and 7/8"-9 UNC coarse threading manufactured to exacting standards. The fastener complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional consistency and mechanical performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, making it suitable for use in regulated industries and international markets.