S-91251A580 5/16"-18 x 5/8" 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
- Corrosion-resistant Black-Oxide finish on alloy steel provides enhanced durability in demanding environments
- Precision Class 3A thread fit delivers superior fastening accuracy and vibration resistance
- Standard hex socket drive allows for easy installation with common 1/4" tools in confined spaces
- Coarse UNC threading enables quick assembly and reduced cross-threading risks
- Full threading along 5/8" length provides maximum grip and adjustment flexibility
- Rockwell C37 hardness rating maintains structural integrity through repeated use cycles
Professional Applications & Engineering Value
These socket head cap screws with Black-Oxide alloy steel construction address critical industrial fastening challenges where corrosion resistance and high tensile strength are paramount. The Class 3A UNC coarse threads provide exceptional engagement in metal-to-metal applications, reducing installation time while maintaining precise alignment in machinery, automotive assemblies, and heavy equipment. The combination of 170,000 PSI tensile strength and Rockwell C37 hardness ensures reliable performance in high-vibration environments, making these industrial fasteners ideal for critical joints requiring consistent clamping force. The standard socket head profile with 1/4" hex drive facilitates access in confined spaces while preventing tool slippage during torque application.
Specification Summary & Compliance
Manufactured to exact inch measurement standards with 5/16"-18 UNC coarse threads maintaining Class 3A thread fit tolerances for precision assembly. These screws conform to ASTM A574 specification for socket head cap screws and demonstrate compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring verified material safety standards.
