S-94705A222 1/2"-13 x 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 and high-pressure conditions.
• High hardness rating of Rockwell C35 provides superior resistance to wear, deformation, and fatigue in demanding industrial environments.
• Coarse UNC threading offers faster installation, reduced cross-threading risk, and better performance in applications with vibration or debris.
• Partial threading design with a 2 3/4" grip length allows for precise clamping force distribution and secure fastening in structural assemblies.
• Class 2A thread fit ensures consistent, precision installation with standard nuts while accommodating minor variations in production tolerances.
• External hex drive enables high-torque application with common tools, facilitating quick assembly and disassembly in confined spaces.
• ASTM A193 Grade B7 compliance guarantees material integrity and performance consistency for high-temperature and high-stress applications.

Professional Applications & Engineering Value

This ASTM Grade B7 hex head screw is engineered to address critical challenges in heavy machinery, pressure vessel systems, and structural steel connections where failure is not an option. The high-strength steel construction, combined with 1/2"-13 UNC coarse threads, provides exceptional resistance to loosening under dynamic loads and thermal cycling. The partially threaded shank design concentrates clamping force precisely where needed, minimizing stress concentration points. With its external hex drive and Class 2A thread fit, it ensures rapid, reliable installation in industrial maintenance, petrochemical plants, and power generation equipment, delivering long-term reliability where standard fasteners would fail.

Specification Summary & Compliance

This fastener meets ASTM A193 Grade B7 specifications with 1/2"-13 UNC coarse threads and Class 2A thread fit for dimensional accuracy. Manufacturing complies with ASTM A193 standards for high-temperature service, ensuring consistent mechanical properties including 125,000 PSI tensile strength and Rockwell C35 hardness. The partially threaded design (1 1/4" thread length on 4" overall length) provides optimal unthreaded shank for structural applications. Suitable for use in environments requiring compliance with industry standards for pressure-boundary components.