S-94705A843 1 1/4"-8 x 6" ASTM A193 Steel Heavy Hex Head Screws for High-Pressure Applications
Steel Heavy Hex Head Screws for High-Pressure Applications
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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 125,000 psi ensures reliable performance under extreme mechanical stress and heavy loads.
- Superior durability from Grade B7 steel and Rockwell C35 hardness provides excellent resistance to wear, deformation, and high-temperature environments.
- Precise Class 2A thread fit guarantees smooth assembly, secure fastening, and reduced risk of cross-threading in critical applications.
- Partially threaded design allows for optimal clamp load distribution and secure joint integrity where unthreaded shank engagement is required.
- External hex drive and standard hex head enable easy installation and high-torque application using common industrial tools.
- UN fine thread profile offers improved vibration resistance and finer adjustment capability compared to coarse threads.
- Full ASTM A193 specification compliance ensures material traceability, consistent quality, and suitability for high-pressure and high-temperature service.
Professional Applications & Engineering Value
This ASTM Grade B7 steel hex head screw is engineered to address demanding industrial challenges where fastener failure is not an option. Its high tensile strength and Rockwell C35 hardness make it ideal for pressure vessels, valve assemblies, and structural connections in petrochemical, power generation, and heavy machinery sectors. The partially threaded configuration with a defined grip length ensures that the unthreaded portion bears directly on the joint, maximizing clamp force and preventing loosening under dynamic loads. Combined with a Class 2A thread fit and UN fine thread, this screw delivers reliable, leak-free performance in high-vibration environments, reducing maintenance downtime and enhancing operational safety.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances for unified (UN) inch-series threads, ensuring dimensional accuracy and interchangeability. It is manufactured in accordance with ASTM A193/A193M specification for high-temperature or high-pressure service, confirming material chemistry and mechanical properties. The screw meets common industry and regulatory requirements for heavy-duty industrial applications, providing assurance of quality and performance consistency.
