S-91251A101 5/16"-18 x 6" 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.
- Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in industrial settings.
- Partially threaded design allows for precise clamping force control and easier alignment in assembled components.
- Hex socket drive with 1/4" drive size enables high-torque installation and removal, minimizing tool slippage and damage.
- Rockwell C37 hardness ensures excellent durability and wear resistance, maintaining integrity under repeated use.
- Coarse UNRC threads facilitate quick assembly and disassembly, improving efficiency in maintenance and production workflows.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial applications, such as machinery assembly, automotive systems, and construction equipment. The Class 3A thread fit and coarse UNRC threads provide superior grip and vibration resistance, preventing loosening in dynamic environments. With a partially threaded shank, it allows for precise load distribution and reduces stress concentration, minimizing the risk of fatigue failure. The high tensile strength and Rockwell C37 hardness ensure long-term reliability under extreme loads, while the black-oxide surface treatment enhances corrosion protection, making it ideal for outdoor or harsh conditions. These features collectively improve assembly efficiency, reduce maintenance downtime, and support robust engineering designs.
Specification Summary & Compliance
This socket head cap screw adheres to Class 3A thread fit for precise dimensional accuracy and UNRC coarse thread standards. It is manufactured in compliance with ASTM A574 specifications, ensuring consistent quality and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
