S-91247A650 3/8"-16 x 7" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance with zinc plating protects against rust and environmental damage, extending service life in industrial and outdoor settings.
• High hardness rating (Rockwell C25) provides excellent wear resistance and durability, maintaining thread integrity through repeated use.
• Coarse UNC threading offers faster installation and better performance in materials where fine threads might strip or fail.
• Partially threaded design allows for precise clamping force distribution, ideal for applications requiring specific grip lengths.
• External hex drive enables easy installation with standard tools, reducing assembly time and labor costs.
• Class 2A thread fit ensures consistent, reliable engagement with mating components while allowing for some tolerance variation.

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering value through its zinc plated steel construction and coarse UNC threading, specifically designed to address common industrial challenges. The 3/8"-16 thread size with partial threading provides optimal stress distribution in structural applications, preventing joint loosening under vibration. The external hex drive facilitates quick installation in confined spaces, while the 120,000 psi tensile strength ensures reliable performance in heavy machinery, construction frameworks, and equipment assembly. The zinc plating offers essential corrosion protection for outdoor installations or humid environments, making these industrial screws suitable for bridge construction, agricultural equipment, and manufacturing fixtures where durability and compliance with industry standards are paramount.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit per UNC standards with 3/8"-16 coarse threading and 7" length with partial threading. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and restricted substance management.