S-92620A274 1 1/8"-12 x 9" 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 demanding industrial applications
• Superior corrosion resistance provided by zinc yellow-chromate plating for extended service life in harsh environments
• Reliable thread engagement with Class 2A fit UNF fine threading ensuring precise assembly and vibration resistance
• High-strength Grade 8 construction with Rockwell C33 hardness for maximum durability and impact resistance
• Optimized torque transmission through external hex drive design for efficient installation and removal
• Partial threading design allowing for concentrated strength where needed while reducing overall weight
• Comprehensive regulatory compliance meeting ASME, SAE, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and high-stress industrial equipment. The 1 1/8"-12 UNF fine threading with Class 2A fit provides superior vibration resistance and precise alignment in applications requiring repeated disassembly. The zinc yellow-chromate plating offers enhanced corrosion protection, significantly extending service life in outdoor or chemically aggressive environments. With 150,000 psi tensile strength and Rockwell C33 hardness, this partially threaded fastener maintains structural integrity under extreme loads, making it ideal for construction equipment, automotive frames, and industrial machinery where failure is not an option. The external hex drive design ensures reliable torque application during installation, reducing the risk of stripping and ensuring consistent clamping force.

Specification Summary & Compliance

This heavy-duty hex head screw features precise Class 2A thread fit with 1 1/8"-12 UNF fine threading in right-hand direction. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, the fastener demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The inch system measurement ensures compatibility with North American industrial standards, while the partially threaded design with 2 3/4" minimum thread length provides optimal strength distribution for critical applications.