S-91236A884 7/8"-9 x 3" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments.
• High tensile strength of 60,000 psi ensures reliable, heavy-duty fastening for critical applications.
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation.
• Coarse UNC threads with Class 2A fit offer faster assembly and reliable performance in a wide range of materials.
• External hex drive and large head (1 5/16" width) allow for high torque application with standard tools.
• Partial threading provides unthreaded shank for precise clamping and shear strength.
• Compliance with ASME B18.2.1 and ASTM A307 guarantees consistent quality and interchangeability.

Professional Applications & Engineering Value

This heavy-duty hex head screw is engineered to solve common industrial fastening challenges, such as structural connections in machinery, construction, and heavy equipment. The steel material with zinc plating combats rust and corrosion, essential for outdoor or high-moisture environments. Its 7/8"-9 UNC coarse thread and Class 2A thread fit ensure quick, secure installation in coarse-grained materials, reducing assembly time while maintaining 60,000 psi tensile strength. The partially threaded design concentrates clamping force, preventing joint loosening under vibration. Ideal for applications requiring robust, ASME B18.2.1 compliant fasteners that meet rigorous industrial standards.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse thread specifications. It is manufactured in accordance with ASME B18.2.1 and ASTM A307 for material and mechanical properties. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental safety and regulatory acceptance in global markets.