S-91251A613 5/16"-18 x 1 1/8" 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 in high-stress applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable finish, extending service life in harsh industrial environments.
- Class 3A thread fit offers superior precision and tight tolerances for secure, vibration-resistant connections in critical assemblies.
- Fully threaded design allows for maximum grip and adjustability, simplifying installation and improving load distribution.
- Hex socket drive with 1/4" size enables easy installation in confined spaces using standard tools, boosting efficiency on the production line.
- Coarse UNRC thread facilitates quick assembly and disassembly, minimizing downtime in maintenance and repair operations.
- Rockwell C37 hardness ensures high durability and wear resistance, maintaining integrity under repeated use and heavy loads.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges, such as vibration loosening and corrosion in demanding settings. With its 5/16"-18 coarse thread and Class 3A fit, it delivers precise, secure fastening in machinery, automotive, and aerospace applications where reliability is critical. The fully threaded rod design enhances load-bearing capacity, while the hex drive allows for efficient torque application in tight spaces. By combining high tensile strength and compliance with industry standards, this screw minimizes maintenance needs and supports long-term operational stability in heavy-duty assemblies.
Specification Summary & Compliance
This socket head cap screw features precise dimensions, including a thread size of 5/16"-18 with Class 3A thread fit and coarse spacing per UNRC standards. It meets ASTM A574 specifications for high-strength fasteners and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.
