S-91251A655 3/8"-16 x 7 1/2" 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 demanding industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies.
- Partially threaded design allows for controlled clamping force and easier alignment in varied material thicknesses.
- Hex socket drive enables high-torque installation with standard tools, minimizing stripping and improving efficiency.
- Coarse UNC threads facilitate quick assembly and disassembly, saving time in maintenance and production cycles.
- Full compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial use, this black-oxide alloy steel socket head cap screw addresses common challenges in machinery, automotive, and construction applications. The 3/8"-16 UNC coarse thread with Class 3A fit delivers exceptional clamping force and vibration resistance, preventing loosening under dynamic loads. Its partially threaded shank concentrates stress appropriately, reducing the risk of thread damage during repeated adjustments. The hex drive design allows for flush mounting in confined spaces, while the black-oxide surface treatment provides a durable barrier against rust and wear. Ideal for high-stress assemblies, this fastener ensures long-term reliability and simplifies maintenance in demanding operational conditions.
Specification Summary & Compliance
This screw meets Class 3A thread tolerances for precision fit and is manufactured in accordance with ASTM A574 specifications for alloy steel socket head cap screws. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards. The UNC coarse thread profile and right-hand thread direction are standardized for compatibility with common industrial components.
