S-91247A658 3/8"-16 x 10" 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 demanding applications, reducing the risk of fastener failure.
• Superior corrosion resistance with zinc plating extends service life in harsh environments, minimizing maintenance and replacement costs.
• High hardness rating (Rockwell C25) provides excellent wear resistance, maintaining thread integrity through repeated use.
• Coarse UNC threading offers faster installation and better debris clearance, improving efficiency in industrial assembly.
• Partial threading design allows for precise clamping force distribution, preventing joint loosening under vibration.
• Class 2A thread fit ensures consistent engagement and easy assembly while maintaining secure fastening.
• External hex drive enables high-torque application with standard tools, speeding up installation in tight spaces.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 5 hex head screws deliver critical performance where structural integrity matters most. The zinc plated steel construction provides essential corrosion protection for outdoor equipment, machinery frames, and construction assemblies exposed to environmental elements. The 3/8"-16 UNC coarse thread configuration ensures rapid installation in steel frameworks and structural components while resisting cross-threading. With partial threading along the 10" length, these fasteners optimize grip range in thick materials and distribute clamping forces effectively across connected surfaces. This combination of high tensile strength and Rockwell C25 hardness makes them ideal for load-bearing connections in manufacturing equipment, transportation infrastructure, and heavy machinery where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

This 10" partially threaded hex head screw features precise 3/8"-16 UNC coarse threading with Class 2A fit tolerance for consistent engagement. Manufactured to Grade 5 strength specifications with 120,000 psi tensile strength and Rockwell C25 hardness. Compliant with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and performance requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for restricted substance control.