S-91274A272 5/16"-18 x 2 3/4" 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 corrosion resistance with zinc-flake coating, ideal for harsh industrial environments and extending service life.
- Superior tensile strength of 170,000 psi ensures reliable performance under high-stress and heavy-duty applications.
- Precise Class 3A thread fit provides secure, vibration-resistant fastening with minimal risk of loosening.
- High hardness (Rockwell C37) offers excellent wear resistance and durability for repeated use.
- 1/4" hex drive socket head allows for easy installation and high torque application in confined spaces.
- Compliance with ASME B18.3 and ASTM A574 standards guarantees consistent quality, dimensional accuracy, and material integrity.
- RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global industrial use.
Professional Applications & Engineering Value
This 5/16"-18 UNC Socket Head Cap Screw is engineered to address critical challenges in industrial assembly, machinery, and structural applications. The zinc-flake-coated alloy steel construction provides a robust barrier against corrosion, significantly reducing maintenance needs in demanding environments like automotive, aerospace, and outdoor equipment. Its partially threaded design and coarse UNC thread facilitate quick, secure fastening in materials where high clamp load is essential. The hex drive socket head enables efficient installation with standard tools, minimizing downtime. By combining high tensile strength and precise Class 3A thread fit, this fastener delivers reliable performance in vibration-prone settings, ensuring long-term joint integrity and reducing the risk of mechanical failure.
Specification Summary & Compliance
This socket head cap screw features a 5/16"-18 UNC coarse thread with a Class 3A thread fit for high precision and a minimum thread length of 1 1/8". It adheres to ASME B18.3 for dimensional standards and ASTM A574 for material specifications, ensuring consistent quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), meeting environmental and safety regulations for industrial use.
