S-94705A844 1 1/4"-8 x 6 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 loads, reducing the risk of fastener failure in critical applications.
• High hardness rating of Rockwell C35 provides superior resistance to wear and deformation, extending service life in demanding environments.
• Fine UN thread with Class 2A fit offers precise engagement and vibration resistance, maintaining secure connections in machinery and structural assemblies.
• Partially threaded design allows for optimal grip length control, ensuring accurate clamping force without unnecessary thread engagement.
• External hex drive and large head (2" width, 25/32" height) facilitates easy installation and high torque application with standard tools, improving assembly efficiency.
• ASTM A193 Grade B7 compliance guarantees material quality and performance consistency for high-temperature and high-pressure industrial applications.
• Robust steel construction combined with inch measurements ensures compatibility with North American equipment standards, simplifying procurement and replacement.

Professional Applications & Engineering Value

This ASTM Grade B7 steel hex head screw is engineered to address critical challenges in heavy-duty industrial settings, where high tensile strength and thermal stability are paramount. The fine UN thread pattern (1 1/4"-8) and Class 2A thread fit provide superior resistance to loosening under vibration, making it ideal for construction, machinery fastening, and pressure vessel assemblies. Its partially threaded configuration ensures that the 3 1/4" grip length delivers consistent clamping force without compromising thread integrity. With a Rockwell C35 hardness and compliance with ASTM A193, this screw maintains performance in elevated temperature environments, preventing structural failures and reducing maintenance downtime in industrial applications.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and UN fine threads (1 1/4"-8) with a 3" thread length. It meets ASTM A193 specifications for material and manufacturing, ensuring reliability in high-strength applications. The product conforms to industry regulations for heavy-duty fasteners, with full traceability for quality assurance in sectors requiring ASTM Grade B7 compliance.