S-91283A268 1 1/4"-7 x 7" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• High tensile strength of 100,000 psi ensures reliable performance in heavy-duty applications, reducing the risk of fastener failure under extreme loads.
• Grade 5 steel construction with Rockwell C19 hardness provides excellent durability and resistance to wear, extending service life in industrial environments.
• 1 1/4"-7 UNC coarse threading with Class 2A fit offers quick assembly and secure fastening, minimizing cross-threading issues in demanding setups.
• Partially threaded design allows for precise clamping force distribution, ideal for applications where unthreaded shank strength is critical.
• External hex drive and hex head facilitate easy installation and removal with standard tools, boosting efficiency in maintenance and assembly tasks.
• Compliance with ASME B18.2.1, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, providing peace of mind for global procurement.
• 7-inch length and right-hand thread deliver versatility for a wide range of construction and machinery applications, supporting stable and long-lasting connections.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address common industrial challenges, such as vibration loosening and structural fatigue in heavy machinery and construction projects. The 1 1/4"-7 UNC coarse thread with Class 2A fit ensures precise engagement and resistance to stripping, while the partially threaded design enhances grip in joint areas without compromising the shank's integrity. Made from high-strength steel and featuring an external hex drive, it simplifies installation in tight spaces, reducing downtime. Ideal for industrial fasteners in equipment assembly, structural frameworks, and automotive applications, this screw delivers consistent performance under high-stress conditions, backed by ASME B18.2.1 standards for reliability and safety.

Specification Summary & Compliance

This screw maintains precise dimensional accuracy with a Class 2A thread fit and adheres to UNC thread standards for coarse spacing. Manufactured in compliance with ASME B18.2.1 and SAE J429 specifications, it meets rigorous industrial requirements. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory acceptance for global use.