S-91251A582 5/16"-18 x 7/8" 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.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic applications.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
- High hardness (Rockwell C37) increases wear resistance, maintaining thread integrity through repeated assembly and disassembly.
- Coarse UNC threads enable quicker installation and are less prone to clogging in dirty or debris-filled settings.
- Hex socket drive design allows for high torque application and secure fastening in confined spaces.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chain integration.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this socket head cap screw delivers robust performance in machinery, automotive assemblies, and heavy equipment. The black-oxide alloy steel construction combats rust and wear, while the coarse UNC thread design resists cross-threading and speeds up installation in high-volume production lines. With a Class 3A thread fit, it provides tight tolerances that prevent back-off under vibration, a common issue in dynamic systems. The fully threaded body ensures uniform load distribution, making it ideal for securing critical components where high strength and durability are non-negotiable. These screws are a trusted solution for engineers seeking reliability in fastener systems that meet rigorous ASTM A574 specifications.
Specification Summary & Compliance
This product features a 5/16"-18 UNC coarse thread with Class 3A fit for precise dimensional accuracy, and is manufactured in accordance with ASTM A574 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.
