S-91274A304 3/8"-16 x 7/8" 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 under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the zinc-flake coating extends service life in harsh or outdoor environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threads enable faster installation and reduced cross-threading risks, improving assembly efficiency.
- Hex socket drive design allows for high torque application and easy access in confined spaces, enhancing installation versatility.
- Full thread coverage ensures consistent clamping force along the entire length for uniform load distribution.
Professional Applications & Engineering Value
This zinc-flake-coated alloy steel socket head cap screw delivers critical performance in demanding industrial settings where corrosion resistance and high tensile strength are paramount. The combination of Class 3A UNC coarse threads and Rockwell C37 hardness addresses common challenges like vibration loosening and thread wear in heavy machinery, automotive assemblies, and structural frameworks. The hex drive design facilitates secure tightening in limited-access areas, while the 170,000 psi tensile strength ensures joint integrity under dynamic loads. Ideal for OEM manufacturing and maintenance applications requiring reliable, long-lasting industrial fasteners that withstand environmental stressors without compromising mechanical performance.
Specification Summary & Compliance
Manufactured to exacting standards including ASME B18.3 and ASTM A574 for dimensional consistency and material properties. Features 3/8"-16 UNC coarse threads with Class 3A fit for precision threading. Corrosion resistance validated per ASTM B117 testing. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.
