S-94705A777 7/8"-9 x 3 1/4" ASTM A193 Steel Heavy Hex Head Screws for High-Pressure Applications

Key Features & Benefits at a Glance

• Exceptional tensile strength of 125,000 psi ensures reliable performance under extreme mechanical loads, reducing the risk of fastener failure in critical applications.
• High hardness rating (Rockwell C35) provides superior resistance to wear and deformation, extending service life in abrasive or high-stress environments.
• Coarse UNC threads with Class 2A fit offer faster assembly and improved vibration resistance, minimizing loosening in dynamic industrial machinery.
• Partial threading design allows for precise clamping force distribution, ideal for applications requiring specific grip length control and joint integrity.
• Heavy-duty hex head with 1 7/16" width enables high-torque installation using standard tools, facilitating quick and secure fastening in confined spaces.
• ASTM A193 compliance guarantees material and manufacturing consistency for high-temperature and high-pressure systems, ensuring regulatory adherence and safety.
• Steel construction with inch measurements delivers robust durability and compatibility with North American industrial equipment, streamlining inventory and replacement processes.

Professional Applications & Engineering Value

This ASTM Grade B7 hex head screw is engineered to address demanding industrial challenges, such as pressure vessel assembly, valve systems, and structural connections where high tensile strength and thermal stability are paramount. The 7/8"-9 UNC coarse thread and Class 2A fit reduce cross-threading risks and enhance load distribution, while the partial threading optimizes stress resistance in dynamic loads. Made from high-strength steel with a Rockwell C35 hardness, it withstands corrosion and mechanical fatigue in harsh environments, ensuring long-term reliability for heavy-duty applications like petrochemical plants and power generation facilities. By meeting ASTM A193 specifications, it provides a trusted solution for engineers prioritizing safety and performance in high-temperature settings.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and UNC coarse threads with a 7/8"-9 size. It conforms to ASTM A193 manufacturing specifications, ensuring material integrity and performance for high-pressure and high-temperature uses. The product meets common industry regulations for quality and safety, supporting reliable integration in industrial hex screw applications without additional compliance concerns.