S-91251A981 1 1/2"-6 x 18" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi provides reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh environments, minimizing maintenance and replacement costs.
• Precise Class 2A thread fit ensures smooth installation and secure fastening, improving assembly efficiency and joint integrity.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and drive performance over repeated use.
• Coarse UNC threads enable quick engagement and reduced cross-threading risks, speeding up assembly in demanding conditions.
• Hex socket drive design allows for high-torque application with standard tools, ensuring tight fastening in confined spaces.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting global industrial standards.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these black-oxide alloy steel socket head cap screws address critical challenges in machinery, construction, and automotive sectors. The coarse UNC thread and Class 2A fit provide reliable engagement in materials prone to vibration and dynamic loads, reducing loosening risks. With a partially threaded design and 18-inch length, they offer versatility for structural connections where unthreaded shanks enhance shear resistance. The hex drive and standard socket head profile facilitate easy installation in tight spaces, while the black-oxide surface treatment combats corrosion, extending service life in outdoor or corrosive environments. Ideal for high-strength fastening in frames, presses, and equipment assemblies, these screws deliver durability and compliance with ASTM A574 specifications.

Specification Summary & Compliance

This product features a 1 1/2"-6 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy, ensuring consistent performance. It meets ASTM A574 manufacturing standards for alloy steel socket head cap screws, providing assurance of material and mechanical properties. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms adherence to environmental regulations, supporting safe use in global industrial markets.