S-91251A267 5-40 x 9/16" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior thread precision with Class 3A fit provides consistent engagement and vibration resistance in demanding applications.
- Durable Black-Oxide finish on alloy steel offers enhanced corrosion resistance and a professional appearance for extended service life.
- High hardness rating of Rockwell C37 minimizes wear and deformation, maintaining integrity through repeated use.
- Coarse UNC threading allows for quicker installation and easier alignment, saving time in assembly processes.
- Hex socket drive design enables secure tool engagement and high torque application without slipping, improving installation efficiency.
- Full threading along the 9/16" length provides maximum grip and adjustability in a variety of material thicknesses.
Professional Applications & Engineering Value
This 5-40 UNC Socket Head Cap Screw is engineered from Black-Oxide Alloy Steel to address critical industrial challenges, such as vibration loosening and corrosion in harsh environments. The coarse thread design and Class 3A thread fit ensure precise, reliable fastening in machinery, automotive, and aerospace assemblies, where misalignment or thread stripping can lead to costly downtime. Its high tensile strength and Rockwell C37 hardness provide durability against dynamic loads, making it ideal for applications requiring repeated disassembly and reassembly. The hex drive and fully threaded rod allow for efficient installation in confined spaces, enhancing productivity while meeting rigorous performance standards.
Specification Summary & Compliance
This screw features a 5-40 UNC coarse thread with Class 3A thread fit for tight tolerances and consistent performance. It complies with ASTM A574 specifications for high-strength socket head cap screws, ensuring manufacturing consistency. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety regulations in global supply chains.
