S-91251A310 5/16"-18 x 1 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
- Superior corrosion resistance with black-oxide coating, ideal for harsh industrial environments
- Exceptional tensile strength of 170,000 psi for reliable performance in high-stress applications
- Precision Class 3A thread fit ensures secure, vibration-resistant connections in critical assemblies
- Partially threaded design provides optimal grip and alignment in mechanical fastening systems
- Standard hex drive compatibility with 1/4" drive for quick installation using common tools
- Coarse UNC thread profile enables faster assembly and superior holding power in various materials
- Rockwell C37 hardness rating delivers excellent wear resistance and long-term durability
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these black-oxide alloy steel socket head cap screws provide critical solutions for machinery, equipment manufacturing, and precision assembly systems. The combination of Class 3A thread fit and UNC coarse threading ensures rapid installation while maintaining vibration resistance in high-cycle operations. The partially threaded configuration allows for precise clamp load distribution, preventing joint loosening in dynamic mechanical systems. With 170,000 psi tensile strength and corrosion-resistant black-oxide finish, these fasteners deliver reliable performance in automotive, aerospace, and heavy equipment applications where failure is not an option. The standardized hex drive socket head design facilitates maintenance and assembly in confined spaces.
Specification Summary & Compliance
This 5/16"-18 UNC socket head cap screw features precise Class 3A thread fit tolerances with coarse thread spacing and 1-7/8" length. Manufactured to ASTM A574 specifications with Rockwell C37 hardness and 170,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
