S-91251A060 2-56 x 7/16" 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.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tight, secure connections with minimal play, enhancing assembly accuracy and vibration resistance.
- High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and disassembly.
- Standard hex drive design allows for easy installation with common tools, speeding up assembly processes and reducing labor time.
- Coarse UNC threading enables quick engagement and reduced cross-threading risks, ideal for rapid production line applications.
- Full compliance with ASTM A574 guarantees consistent quality and mechanical properties, ensuring reliability in critical engineering uses.
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws are engineered to address common industrial challenges such as vibration loosening, corrosion degradation, and high-load demands. The 2-56 UNC coarse thread design ensures rapid, secure fastening in materials where fine threads might strip, while the Class 3A thread fit provides superior clamping force retention in dynamic environments. The black-oxide surface treatment not only enhances corrosion resistance but also reduces galling during installation, making these screws ideal for machinery, automotive assemblies, and electronic enclosures requiring high-strength, corrosion-resistant fasteners. Their 5/64" hex drive compatibility with standard tools streamlines maintenance and reduces downtime in production settings.
Specification Summary & Compliance
Manufactured to inch system dimensions with a Class 3A thread fit for precise engagement, these screws adhere to UNC coarse thread standards and ASTM A574 specifications for consistent mechanical properties. They are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.
