S-91236A899 7/8"-9 x 8" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 60,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and secure fastening
• High durability backed by Rockwell B69 hardness, maintaining structural integrity under repeated stress
• Easy installation and removal with external hex drive and 1 5/16" head width for standard tool compatibility
• Versatile partial threading allowing precise clamping force control across various material thicknesses
• Regulatory compliance assurance meeting ASME B18.2.1 and ASTM A307 specifications for quality and safety

Professional Applications & Engineering Value

This 7/8"-9 UNC hex head screw delivers critical engineering solutions for heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The steel construction with zinc plating provides essential corrosion protection in manufacturing facilities, construction sites, and machinery assembly. The coarse UNC threading ensures rapid installation and superior holding power in wood, metal, and composite materials, while the partial threading design allows engineers to precisely control clamping force across varying material thicknesses. With its external hex drive and substantial head dimensions, this fastener enables efficient installation using standard tools, reducing assembly time in production environments where reliability and speed are crucial for operational efficiency.

Specification Summary & Compliance

Manufactured to exacting standards, this hex head screw features Class 2A thread fit per UNC specifications, ensuring proper clearance and engagement. The 8" length with 2 1/4" minimum thread length provides versatile fastening capabilities. Compliance includes ASME B18.2.1 dimensional standards and ASTM A307 material specifications for mechanical properties. Environmental regulations adherence includes RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, ensuring responsible manufacturing practices and material safety for industrial use across global markets.