S-91247A859 3/4"-10 x 6" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating that protects against environmental degradation
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and reduced cross-threading risk
• Enhanced torque transmission through the external hex drive design that prevents tool slippage during installation
• Controlled thread distribution with partial threading that concentrates strength where needed most
• Consistent mechanical properties with Rockwell C25 hardness ensuring dimensional stability under stress
• Industry-standard compatibility meeting ASME B18.2.1 specifications for reliable interchangeability

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The zinc plated steel construction provides essential corrosion protection in manufacturing environments, while the 3/4"-10 UNC coarse thread configuration ensures rapid installation in structural steel, machinery assembly, and equipment frameworks. The partial threading design concentrates tensile strength directly at the fastener's engagement point, preventing thread stripping in high-vibration scenarios. With its external hex drive and substantial 1 1/8" head width, this fastener accommodates high torque applications common in construction, automotive, and industrial maintenance, delivering reliable fastening solutions that withstand extreme operational demands.

Specification Summary & Compliance

This 6" length hex head screw features precise Class 2A thread fit tolerances with UNC coarse threading (3/4"-10) and 1 3/4" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications, it ensures dimensional consistency and mechanical reliability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for regulated industrial applications requiring verified material safety standards.