S-92620A276 1 1/4"-12 x 3 1/4" 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 corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
• Precise thread engagement with Class 2A fit and UNF fine threading for secure fastening and vibration resistance
• Optimized torque transmission via external hex drive and large 1 7/8" head width for easy installation with standard tools
• Enhanced durability with Rockwell C33 hardness and Grade 8 classification for long-term mechanical integrity
• Versatile partial threading design allowing for both clamping and alignment functions in assembled components
• Full regulatory compliance meeting ASME, SAE, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where high tensile strength and corrosion resistance are paramount. The zinc yellow-chromate plated steel construction provides superior protection against environmental degradation, while the 1 1/4"-12 UNF fine thread configuration ensures precise clamping force distribution and vibration resistance in dynamic load conditions. The partially threaded design allows for both secure fastening and component alignment, making it ideal for construction equipment, automotive frames, and industrial machinery requiring Class 2A thread fit precision. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness guarantees reliable performance in the most demanding applications where fastener failure is not an option.

Specification Summary & Compliance

This heavy-duty fastener maintains Class 2A thread fit tolerances with 1 1/4"-12 UNF fine threading and partial threading configuration. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, it delivers consistent dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.