S-91274A356 3/8"-16 x 4 1/2" 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
- Superior corrosion resistance with zinc-flake coating, ideal for harsh industrial environments and extending service life
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress and heavy-duty applications
- Precise Class 3A thread fit provides excellent engagement and vibration resistance in critical assemblies
- Robust Rockwell C37 hardness offers high wear resistance and durability for repeated use
- Hex socket drive design allows for high-torque installation and secure fastening in confined spaces
- Compliance with ASME B18.3 and ASTM A574 standards guarantees consistent quality and dimensional accuracy
- RoHS 3 and REACH compliant for safe use in regulated industries and global market acceptance
Professional Applications & Engineering Value
This zinc-flake-coated alloy steel socket head cap screw is engineered to address common industrial challenges such as joint failure under dynamic loads and corrosion in demanding environments. The UNC 3/8"-16 coarse thread and Class 3A fit ensure quick assembly and secure fastening, reducing installation time while maintaining integrity in high-vibration machinery, automotive systems, and heavy equipment. The partially threaded design provides unthreaded shank strength where needed, making it ideal for precision clamping applications. With its hex drive and high tensile strength, it delivers reliable performance in construction, aerospace, and manufacturing sectors where durability and compliance are critical.
Specification Summary & Compliance
This fastener features a 3/8"-16 UNC coarse thread with Class 3A precision fit for tight tolerances and optimal thread engagement. It complies with ASME B18.3 and ASTM A574 specifications, ensuring consistent manufacturing quality. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety standards for industrial use.
