S-92620A351 1 1/2"-6 x 12" 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 and Grade 8 classification, ensuring reliable performance in high-stress applications.
• Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh industrial environments.
• Optimized for high-torque installation with an external hex drive and large 2 1/4" head width, allowing for secure tightening and easy removal.
• Enhanced durability and wear resistance due to Rockwell C33 hardness, maintaining structural integrity under repeated use.
• Reliable coarse threading (1-1/2"-6 UNC) with Class 2A fit, providing quick assembly and reduced cross-threading risks in coarse materials.
• Versatile partial threading design offering both strong grip in the threaded section and smooth shank for precise clamping control.
• Compliance with major industrial standards including ASME B18.2.1 and SAE J429, ensuring interchangeability and quality assurance.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for demanding applications where failure is not an option. The steel material combined with zinc yellow-chromate plating provides robust protection against rust and chemical exposure, making it ideal for outdoor machinery, construction equipment, and heavy vehicle assembly. Its 1-1/2"-6 UNC coarse thread and Class 2A thread fit ensure rapid, secure fastening in structural steel, castings, and thick plates, reducing installation time while maintaining alignment accuracy. The partially threaded design allows the unthreaded shank to bear shear loads effectively, preventing joint loosening under vibration. Commonly used in industrial bolting, infrastructure projects, and mining equipment, this fastener delivers consistent performance where high tensile strength and corrosion resistance are critical.

Specification Summary & Compliance

This screw adheres to Class 2A thread tolerance per UNC standards, ensuring precise fit and interchangeability. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. It is confirmed RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.