S-91247A652 3/8"-16 x 8" 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 for reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Zinc plating finish provides superior corrosion resistance, extending the lifespan of the screw in harsh environments.
• Grade 5 steel construction with Rockwell C25 hardness ensures durability and resistance to wear, ideal for repetitive or heavy-duty use.
• Coarse UNC threading with Class 2A fit allows for quick and secure installation, minimizing cross-threading and improving assembly efficiency.
• Partially threaded design offers optimal clamping force and vibration resistance, enhancing joint stability in machinery and structural applications.
• External hex drive and hex head enable easy tightening with standard tools, speeding up maintenance and reducing labor time.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability, ensuring reliable fastening in regulated industries.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address common industrial challenges, such as vibration loosening and corrosion-induced failures. The 3/8"-16 UNC coarse thread and partial threading design provide enhanced grip and load distribution, making it ideal for heavy machinery, construction frameworks, and automotive assemblies where high tensile strength and durability are critical. The zinc plating surface treatment offers added protection against rust, extending service life in outdoor or humid conditions. By meeting rigorous standards like ASME B18.2.1, this fastener ensures precision and reliability, reducing downtime and maintenance costs in industrial applications that demand robust and compliant fastening solutions.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and adheres to UNC thread standards for consistent performance. It complies with ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring dimensional accuracy and strength reliability. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.