S-91251A662 5/16"-18 x 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
- Superior tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Exceptional hardness (Rockwell C37) provides excellent wear resistance and durability for long-lasting use in demanding environments.
- Precise Class 3A thread fit offers tighter tolerances for secure fastening and vibration resistance in critical assemblies.
- Black-oxide coating on alloy steel enhances corrosion resistance and provides a professional, low-glare finish.
- 1/4" hex drive socket head allows for easy installation and removal with standard tools, even in confined spaces.
- Partially threaded design combines the benefits of a smooth shank for alignment with strong threaded engagement.
- Compliance with ASTM A574 ensures consistent quality and performance for industrial and engineering applications.
Professional Applications & Engineering Value
This 5/16"-18 UNC Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The Black-Oxide Alloy Steel construction, combined with a Class 3A thread fit, provides superior clamp load retention and resistance to dynamic stresses in machinery, automotive, and heavy equipment assemblies. The coarse thread (UNC) design ensures quick installation and reliable performance in materials where fine threads might strip. With a partially threaded shank, it offers optimal shear strength and alignment, making it ideal for precision applications requiring both structural integrity and ease of assembly. These screws are commonly used in high-strength fastening scenarios where durability and compliance with industry standards are critical.
Specification Summary & Compliance
This product features a 5/16"-18 UNC coarse thread with Class 3A fit for precise dimensional accuracy. It meets ASTM A574 specifications for high-strength socket head cap screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use in industrial settings.
