S-91274A344 3/8"-16 x 3 1/4" 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 provides reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance and replacement costs.
- Precise Class 3A thread fit ensures secure, vibration-resistant connections, enhancing assembly integrity and safety.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and disassembly.
- Partially threaded design allows for controlled clamping force, ideal for applications requiring specific grip lengths.
- Coarse UNC threads enable quick installation and reduced cross-threading risks, improving assembly efficiency.
- Compliance with ASME, ASTM, RoHS 3, and REACH guarantees quality, safety, and environmental standards are met for global industrial use.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these Socket Head Cap Screws combine zinc-flake-coated alloy steel with a Class 3A thread fit to address common challenges like vibration loosening and corrosion in machinery, automotive, and construction assemblies. The coarse UNC threads facilitate rapid installation in tough materials, while the partially threaded rod design provides optimal clamping without unnecessary thread engagement. With a 170,000 psi tensile strength and Rockwell C37 hardness, they withstand extreme loads and repetitive stress, ensuring long-term reliability in heavy-duty applications where fastener failure is not an option.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit per UNC standards, with precise dimensions including a 3/8"-16 thread size and 3 1/4" length. Manufacturing follows ASME B18.3 and ASTM A574 specifications, with corrosion testing per ASTM B117. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
