S-91268A113 1 1/8"-7 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with a 150,000 PSI tensile strength and Grade 8 classification, ensuring reliable performance under high stress.
• Superior durability and wear resistance provided by Rockwell C33 hardness, extending the fastener's service life in harsh industrial environments.
• Easy and secure installation thanks to the external hex head design, allowing for high torque application with standard tools.
• Optimized for quick assembly with coarse UNC threads and Class 2A fit, reducing the risk of cross-threading and speeding up production processes.
• Full threading for maximum grip along the entire 2 1/2" length, providing consistent clamping force and vibration resistance.
• Compliance with major industry standards including ASME B18.2.1 and SAE J429, ensuring interchangeability and reliability in professional applications.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical fastening challenges in heavy machinery, construction, and industrial equipment where failure is not an option. The high-strength steel construction and fully threaded coarse UNC design provide exceptional resistance to vibration loosening and dynamic loads, addressing common failure points in demanding applications. The external hex drive enables precise torque control during installation, preventing under or over-tightening that can compromise joint integrity. With its 1 1/8"-7 UNC thread size and 150,000 PSI tensile strength, this fastener delivers reliable performance in structural connections, heavy equipment assembly, and other applications requiring superior load-bearing capacity and long-term reliability under extreme conditions.

Specification Summary & Compliance

This heavy-duty hex head screw features precise Class 2A thread fit with 1 1/8"-7 UNC coarse threads in right-hand direction, manufactured to exacting dimensional standards. The fastener complies with ASME B18.2.1 specifications where identified with SAE J429, ensuring mechanical properties and dimensional consistency. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, confirming the product meets current regulatory standards for hazardous substance restrictions.