S-91268A235 1 1/4"-7 x 16" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: Grade 8 steel construction and 150,000 psi tensile strength provide superior resistance to heavy loads and stress, ensuring reliable performance in demanding applications.
• Enhanced Durability and Wear Resistance: Rockwell C33 hardness offers excellent resistance to abrasion and deformation, extending the fastener's service life in harsh industrial environments.
• Secure and Reliable Fastening: Coarse UNC threading with a Class 2A fit ensures easy installation and a strong, vibration-resistant hold, reducing the risk of loosening over time.
• Optimized for High-Torque Applications: The large 1 7/8" external hex head allows for high torque application with standard tools, facilitating quick and secure assembly.
• Versatile Partially Threaded Design: The 16" length with a 3" minimum thread length provides flexibility for applications requiring both clamped and unthreaded sections, improving structural integrity.
• Compliance with Industry Standards: Manufactured to meet ASME B18.2.1 and SAE J429 specifications, ensuring consistent quality, interchangeability, and reliability in professional use.
• Environmentally Responsible Manufacturing: RoHS 3 and REACH compliance guarantees the screw is free from hazardous substances, making it suitable for regulated industries and global supply chains.

Professional Applications & Engineering Value

This Grade 8 steel hex head screw is engineered to address critical challenges in heavy machinery, construction, and structural assembly, where failure is not an option. The 1 1/4"-7 UNC coarse thread and Class 2A fit provide rapid installation and superior resistance to vibrational loosening, a common issue in dynamic loads. Made from high-strength steel with a Rockwell C33 hardness, it withstands extreme forces and environmental wear, reducing maintenance frequency and downtime. The partially threaded design allows for precise clamping in bolted joints, preventing shear stress concentration. Ideal for industrial applications like equipment frames, automotive systems, and infrastructure projects, this fastener delivers reliability under 150,000 psi tensile strength, ensuring long-term operational safety and efficiency.

Specification Summary & Compliance

This hex head screw features precise UNC coarse threading (1 1/4"-7) with a Class 2A thread fit for consistent engagement and ease of assembly. It adheres to ASME B18.2.1 and SAE J429 manufacturing standards, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in environmentally sensitive and regulated industries.