S-91247A851 3/4"-10 x 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 applications, reducing the risk of fastener failure.
• Grade 5 classification provides a robust balance of strength and durability, ideal for demanding industrial and construction uses.
• Zinc plating finish offers superior corrosion resistance, extending the screw's service life in harsh environments.
• Coarse UNC thread design with Class 2A fit allows for faster installation and easier alignment, saving time on assembly lines.
• Partially threaded shank with 1 3/4" minimum thread length provides enhanced grip and clamping force where needed, improving joint stability.
• External hex drive and hex head enable secure, high-torque tightening with standard tools, minimizing slippage and wear.
• Compliance with ASME B18.2.1 and SAE J429 standards ensures consistent quality and interoperability in mechanical systems.

Professional Applications & Engineering Value

This 3/4"-10 UNC Grade 5 hex head screw is engineered to address common challenges in heavy-duty industrial settings, such as structural assembly, machinery fabrication, and equipment maintenance. The zinc plated steel construction combats rust and corrosion, making it suitable for outdoor or humid conditions, while the coarse thread and Class 2A thread fit facilitate quick, secure fastening even in misaligned or vibrating environments. With a Rockwell C25 hardness and 120,000 psi tensile strength, it withstands dynamic loads and shear forces, reducing maintenance downtime. The partially threaded design concentrates clamping force effectively, preventing joint loosening in applications like frame construction and automotive systems, ensuring long-term reliability and safety.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and adheres to UNC coarse thread standards with a 3/4"-10 size. It complies with ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring dimensional accuracy and performance consistency. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for use in various industrial sectors.