S-91247A678 7/16"-14 x 2 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 applications, reducing the risk of fastener failure.
• Zinc plating provides superior corrosion resistance, extending service life in harsh industrial environments and minimizing maintenance needs.
• Grade 5 steel construction with Rockwell C25 hardness offers excellent durability and resistance to wear, ideal for repetitive assembly and disassembly.
• UNC coarse threading and Class 2A thread fit enable quick, secure installation and reduce cross-threading risks, saving time during assembly.
• Partially threaded design with a 2 1/4" length allows for precise clamping force control, preventing over-tightening and material damage.
• External hex drive and standard 5/8" head width facilitate easy installation with common tools, improving workflow efficiency.
• Compliance with ASME, SAE, RoHS, and REACH standards ensures product reliability and environmental safety for global industrial use.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in demanding environments. The zinc plating acts as a protective barrier, significantly reducing rust and wear in applications like machinery assembly, structural frameworks, and automotive components. Its UNC coarse threads and Class 2A fit provide a secure, vibration-resistant connection, minimizing the need for frequent retightening. The partial threading design ensures optimal grip without compromising material integrity, making it ideal for heavy-duty fastening where precision and strength are critical. By integrating high tensile strength and standardized dimensions, this screw delivers consistent performance in construction, manufacturing, and equipment maintenance, enhancing operational reliability.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and UNC coarse threading with a thread size of 7/16"-14, ensuring dimensional accuracy per ASME B18.2.1 and SAE J429 standards. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious industrial use. The manufacturing adheres to strict quality controls for length (2 1/4"), thread diameter (0.4375"), and material properties, providing reliable performance in regulated applications.