S-91247A328 7/16"-20 x 3" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 5 classification and 120,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the zinc plating, extending the fastener's service life in various industrial environments.
• Secure and precise fastening enabled by the UNF fine thread and Class 2A thread fit, minimizing the risk of loosening in vibration-prone settings.
• Optimized for high-torque installation thanks to the external hex drive and 5/8" head width, allowing for efficient assembly with common tools.
• Enhanced durability and wear resistance from the Rockwell C25 hardness, maintaining thread integrity through repeated use.
• Versatile partial threading design offering a non-threaded shank for precise clamping in specific assembly scenarios.
• Guaranteed compliance and interoperability by meeting ASME B18.2.1 and SAE J429 standards, ensuring consistent quality and fit.

Professional Applications & Engineering Value

This 7/16"-20 UNF Hex Head Screw is engineered to address critical challenges in industrial assembly and heavy-duty machinery. Constructed from high-strength Grade 5 steel, it provides the necessary 120,000 psi tensile strength to withstand significant dynamic loads and vibrations, a common failure point in equipment. The zinc plating offers a protective barrier against corrosion, which is essential for maintaining fastener integrity in harsh or outdoor environments. The UNF fine thread and Class 2A thread fit ensure a tight, precise engagement, reducing the risk of stripping and providing reliable clamping force. Its external hex drive and robust head design facilitate high-torque installation, making it ideal for applications in automotive, construction, and manufacturing where secure, long-lasting fastening is paramount.

Specification Summary & Compliance

This fastener features a 7/16"-20 UNF thread with a fine thread spacing and a Class 2A thread fit, ensuring dimensional accuracy and interchangeability. It is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for use in regulated markets.