S-91251A739 1/2"-13 x 6 1/4" 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 extreme loads, reducing the risk of fastener failure in critical applications.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
- Precise Class 3A thread fit provides secure, vibration-resistant connections, minimizing loosening in high-stress assemblies.
- High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Hex socket drive design allows for high-torque installation in confined spaces, improving assembly efficiency.
- Coarse UNRC threads enable quick engagement and reduced cross-threading risk, speeding up production processes.
- Partial threading provides unthreaded shank for precise clamping force distribution in structural applications.
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these black-oxide alloy steel socket head cap screws deliver exceptional performance where reliability is non-negotiable. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures these fasteners withstand extreme mechanical stresses in heavy machinery, automotive assemblies, and construction equipment. The corrosion-resistant black-oxide coating protects against degradation in moist or chemically aggressive settings, while the Class 3A thread fit maintains joint integrity under vibration. The hex socket drive accommodates high torque requirements in space-constrained applications, making these partially threaded screws ideal for precision clamping in structural frameworks and industrial manufacturing.
Specification Summary & Compliance
This socket head cap screw features 1/2"-13 coarse UNRC threads with Class 3A fit for precision tolerance, manufactured to ASTM A574 specifications. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental safety and regulatory adherence for industrial use.
