S-91251A012 1/2"-20 x 1" 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 mechanical strength with 170,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by the black-oxide finish, extending service life in demanding environments
- Precision thread engagement with Class 3A fit and UNF fine threads ensuring secure, vibration-resistant connections
- Optimized torque transmission through the 3/8" hex drive socket head, preventing stripping during installation
- Consistent dimensional accuracy maintained through full compliance with ASTM A574 manufacturing standards
- Environmental regulation compliance meeting RoHS 3 and REACH requirements for global industrial use
- Enhanced durability from Rockwell C37 hardness, resisting wear and deformation under heavy loads
Professional Applications & Engineering Value
Engineered for precision assemblies requiring high tensile strength and corrosion resistance, these black-oxide alloy steel socket head cap screws solve critical fastening challenges in machinery, automotive, and heavy equipment applications. The UNF fine thread configuration with Class 3A fit provides superior vibration resistance and clamping force distribution, preventing loosening in dynamic operating conditions. The hex drive socket head design allows for high-torque installation in confined spaces, while the black-oxide surface treatment creates a protective barrier against moisture and chemicals. These industrial fasteners deliver reliable performance in precision engineering applications where mechanical integrity and regulatory compliance are paramount.
Specification Summary & Compliance
This socket head cap screw features precise 1/2"-20 UNF fine threads with Class 3A thread fit for tight tolerance applications. Manufacturing conforms to ASTM A574 specification requirements, ensuring consistent dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial markets requiring strict chemical substance control.
