S-91247A332 7/16"-20 x 3 3/4" 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 in high-stress industrial applications, reducing the risk of fastener failure.
• Zinc plating provides superior corrosion resistance, extending the service life of the screw in harsh environments and minimizing maintenance needs.
• Grade 5 steel construction with Rockwell C25 hardness offers excellent durability and wear resistance, ideal for heavy-duty fastening tasks.
• Fine UNF threading (7/16"-20) with Class 2A fit delivers precise, secure connections with reduced likelihood of loosening under vibration.
• External hex drive and hex head design allows for easy installation and removal with standard tools, improving assembly efficiency.
• Partial threading provides unthreaded shank strength where needed, optimizing grip and load distribution in assembled components.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in professional engineering projects.

Professional Applications & Engineering Value

This 7/16"-20 UNF Grade 5 steel hex head screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in demanding environments. The fine thread configuration enhances clamping force and seating precision, making it ideal for machinery, automotive assemblies, and structural frameworks where reliable fastening is critical. The zinc plating acts as a protective barrier against moisture and chemicals, significantly reducing oxidation and prolonging component life. With its high tensile strength and Rockwell C25 hardness, this screw withstands heavy loads and repetitive stress, ensuring long-term stability in heavy-duty applications. Its external hex drive facilitates quick installation, streamlining maintenance and reducing downtime in production settings.

Specification Summary & Compliance

This screw features a 3 3/4" length with partial threading and a minimum thread length of 1 1/8". It adheres to Class 2A thread fit for precise dimensional accuracy and 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, ensuring it meets environmental and safety standards for industrial use.