S-91274A520 1/2"-13 x 8" ASME B18.3, ASTM A574, ASTM B117 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 industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc-flake coating extends service life in harsh environments, minimizing maintenance and replacement costs.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections, enhancing assembly integrity and safety.
- High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity over repeated use.
- Coarse UNC threading allows for quicker installation and easier alignment, saving time in production and maintenance.
- Partially threaded design offers optimal grip and clamping force control, ideal for applications requiring precise load distribution.
- Compliance with ASME B18.3 and ASTM A574 ensures consistent quality and interoperability with standard components, streamlining procurement.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this Socket Head Cap Screw combines zinc-flake-coated alloy steel with a Class 3A thread fit to address common challenges like vibration loosening and environmental degradation. The coarse UNC thread facilitates rapid assembly in heavy machinery, construction equipment, and automotive systems, where high tensile strength (170,000 PSI) and corrosion resistance are critical. Its partially threaded configuration ensures stable clamping in dynamic loads, reducing stress concentrations. Ideal for industrial socket head screw applications, it delivers long-term reliability under extreme conditions, supported by rigorous manufacturing standards.
Specification Summary & Compliance
This screw features a 1/2"-13 UNC coarse thread with Class 3A precision fit, adhering to ASME B18.3 and ASTM A574 specifications for dimensional accuracy and mechanical properties. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring environmental safety and regulatory alignment for global industrial use.
