S-91274A264 5/16"-18 x 2 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 corrosion resistance from 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 major standards including ASME B18.3, ASTM A574, and ASTM B117 guarantees consistent quality and reliability.
- RoHS 3 and REACH compliance ensures environmental safety and meets global regulatory requirements for industrial components.
Professional Applications & Engineering Value
This zinc-flake-coated alloy steel socket head cap screw is engineered to solve critical challenges in demanding industrial settings. The UNC coarse thread and Class 3A fit ensure rapid assembly and a secure hold, reducing the risk of thread stripping in soft materials or under dynamic loads. The partially threaded design provides optimal clamping force where needed, making it ideal for machinery, automotive assemblies, and heavy equipment. The zinc-flake coating delivers superior corrosion resistance compared to standard platings, addressing failure points in outdoor or chemically exposed environments. Combined with a 1/4" hex drive, it facilitates efficient maintenance and installation, saving time and labor costs in production and repair workflows.
Specification Summary & Compliance
This socket head cap screw features a 5/16"-18 UNC coarse thread with a Class 3A thread fit for precision and strength. It is manufactured from alloy steel to meet ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy and performance consistency. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), affirming its adherence to environmental and safety standards for industrial use.
