S-91247A917 1"-8 x 3 1/4" 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.
• Superior corrosion resistance with zinc plating protects against rust and environmental damage, extending service life in demanding conditions.
• High hardness rating (Rockwell C25) provides excellent wear resistance and durability, maintaining structural integrity under repeated use.
• Coarse UNC threading with Class 2A fit allows for quick installation and secure fastening, minimizing assembly time and improving efficiency.
• Partially threaded design offers optimal grip and clamping force, ideal for applications requiring precise load distribution.
• External hex drive enables easy tightening with standard tools, facilitating straightforward maintenance and adjustments.
• Compliance with industry standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interoperability in mechanical systems.

Professional Applications & Engineering Value

This Grade 5 Steel Hex Head Screw is engineered to address critical challenges in heavy-duty industrial environments, such as machinery assembly, structural frameworks, and equipment manufacturing. The combination of high tensile strength and Rockwell C25 hardness ensures it can withstand substantial vibrational loads and dynamic stresses without compromising integrity. The zinc-plated finish provides a protective barrier against moisture and chemicals, reducing maintenance costs and downtime in corrosive settings. With its 1"-8 UNC coarse thread and partial threading, it delivers secure clamping in materials where full threading is unnecessary, optimizing both installation speed and joint reliability. Ideal for construction, automotive, and industrial machinery, this fastener meets rigorous demands while adhering to recognized standards like ASME B18.2.1 and SAE J429, ensuring compatibility and safety in professional applications.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit and UNC coarse threading with a thread size of 1"-8, ensuring accurate engagement and consistent performance. It complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, confirming it is free from hazardous substances and safe for use in various industrial sectors.