S-92620A240 1 1/4"-12 x 4 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 Grade 8 rating and 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh industrial environments
• Precise thread engagement with Class 2A fit and UNF fine threading for secure fastening and vibration resistance
• Optimized partial threading design providing maximum grip length where needed while reducing weight and material usage
• Heavy-duty hex head design with 1 7/8" width and external drive for high-torque installation using standard tools
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability and reliability
• Enhanced durability with Rockwell C33 hardness maintaining structural integrity under repeated loading conditions

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where failure is not an option. The zinc yellow-chromate plated steel construction provides exceptional corrosion resistance in demanding environments, while the 1 1/4"-12 UNF fine threading ensures superior vibration resistance and precise clamping force distribution. The partially threaded design concentrates strength where needed most, preventing thread damage during assembly and reducing stress concentration points. Engineered to ASME B18.2.1 standards, these screws offer reliable performance in construction, manufacturing, and automotive applications where high-strength fastening is essential for safety and operational integrity.

Specification Summary & Compliance

This heavy-duty fastener features Class 2A thread fit tolerance for precise engagement and 1 1/4"-12 UNF fine threading meeting standardized dimensions. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring verified material safety and environmental responsibility.