S-91286A244 3/8"-24 x 1 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, ideal for high-stress industrial assemblies.
• Superior corrosion resistance due to zinc-flake coating, extending service life in harsh environments.
• Reliable torque transmission with external hex drive and hex head design for secure tightening.
• Precise thread engagement through Class 2A fit and UNF fine thread, minimizing vibration loosening.
• Consistent mechanical performance ensured by Grade 8 certification and Rockwell C33 hardness.
• Full threading for maximum grip across the entire 1 1/4" length, enhancing joint stability.
• Compliance with major standards including ASME B18.2.1 and SAE J429 for guaranteed interoperability.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, automotive, and structural applications where high tensile strength and vibration resistance are paramount. The 3/8"-24 UNF fine thread with Class 2A fit ensures tight, secure fastening that withstands dynamic loads and reduces the risk of thread stripping. Made from robust steel and finished with a zinc-flake coating, it offers excellent protection against corrosion, making it suitable for outdoor or chemically exposed environments. Its external hex drive allows for efficient installation with standard tools, streamlining assembly processes in industrial settings while meeting rigorous ASME and SAE specifications.

Specification Summary & Compliance

The screw features a 3/8"-24 UNF fine thread with Class 2A thread fit for precise dimensional accuracy, adhering to ASME B18.2.1 and SAE J429 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.