S-94705A823 1 1/8"-8 x 6" 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 prevents fastener failure in critical applications.
• High-temperature and pressure resistance from Grade B7 steel construction maintains integrity in demanding industrial environments like petrochemical and power generation.
• Precise Class 2A thread fit guarantees smooth assembly, reduces cross-threading risks, and provides consistent clamping force for secure connections.
• Robust Rockwell C35 hardness offers superior wear resistance and durability, extending service life even under repetitive stress and vibration.
• Partially threaded design with a 3.5-inch grip length allows for optimal load distribution and secure fastening in thick materials or flanged assemblies.
• External hex drive and standard hex head enable easy installation and high-torque tightening with common tools, streamlining maintenance and assembly processes.
• Compliance with ASTM A193 specifications assures material quality, manufacturing consistency, and suitability for high-stress, high-temperature service.

Professional Applications & Engineering Value

This Grade B7 steel hex head screw is engineered to address the rigorous demands of high-temperature and high-pressure environments, such as those found in pressure vessel systems, valve assemblies, and structural supports in the oil, gas, and power generation industries. The partially threaded design with a defined grip length ensures that the unthreaded shank bears the shear load effectively, reducing stress concentration on the UN fine threads and enhancing joint integrity. Made from ASTM A193 compliant steel, it provides consistent performance where thermal cycling and mechanical fatigue are concerns. The external hex drive facilitates straightforward installation and removal, even in confined spaces, making it a reliable choice for industrial maintenance and heavy-duty engineering projects that require durable, high-strength fastening solutions.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and a 1 1/8"-8 UN fine thread for enhanced load distribution. It is manufactured in accordance with ASTM A193 specifications for high-temperature service, ensuring material traceability and performance reliability. The screw meets common industry requirements for material properties and is suitable for applications demanding compliance with recognized engineering standards.