S-91251A466 1-72 x 1" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precise Class 3A thread fit provides excellent engagement and vibration resistance, maintaining secure connections in dynamic environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for long-term use.
• Fine UNF threads allow for finer adjustments and better clamping force in precision assemblies compared to coarse threads.
• Partially threaded design concentrates threads where needed, improving grip and reducing the risk of cross-threading during installation.
• Hex socket drive enables high-torque application with standard tools, facilitating easy installation and removal in confined spaces.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting strict industrial and regulatory standards.

Professional Applications & Engineering Value

These 1-72 UNF socket head cap screws are engineered to address critical challenges in precision machinery, aerospace, and automotive sectors where vibration resistance and high tensile strength are paramount. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, provides exceptional durability against wear and environmental exposure, reducing maintenance needs. The fine thread and Class 3A fit ensure tight tolerances, minimizing loosening under dynamic loads. Ideal for partially threaded applications, these screws offer reliable fastening in assemblies requiring precise thread engagement without compromising structural integrity, making them a trusted choice for industrial fasteners in demanding conditions.

Specification Summary & Compliance

This product adheres to Class 3A thread fit for high precision in the inch system, with UNF fine threads (1-72 size) and a partially threaded rod design. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent manufacturing quality. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental and safety standards in global supply chains.