S-91251A661 5/16"-18 x 7" 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 demanding industrial environments.
- Rockwell C37 hardness delivers excellent wear resistance and durability, maintaining thread integrity through repeated use.
- 1/4" hex drive with standard socket head allows for easy installation and high torque application, improving assembly efficiency.
- Partially threaded design enables precise clamping force control, ideal for applications requiring specific grip range.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting global regulatory standards.
Professional Applications & Engineering Value
These Black-Oxide Alloy Steel Socket Head Cap Screws with 5/16"-18 UNC coarse threads are engineered to address critical industrial challenges. The Class 3A thread fit and 170,000 psi tensile strength provide secure fastening in high-vibration machinery, automotive assemblies, and heavy equipment, preventing joint failure. The black-oxide surface treatment resists corrosion in humid or chemically aggressive environments, while the 1/4" hex drive facilitates quick installation in confined spaces. Ideal for industrial fasteners requiring precise torque and long-term reliability, these screws reduce maintenance downtime and enhance operational safety in demanding applications.
Specification Summary & Compliance
This product features 5/16"-18 UNC coarse threads with Class 3A precision fit and a minimum thread length of 1 1/8". Manufactured from alloy steel with Rockwell C37 hardness, it meets ASTM A574 specifications for quality assurance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global industrial use.
