S-92655A677 7/8"-9 x 4 1/4" ASTM A193 18-8 Stainless Steel Heavy Hex Head Screws for High-Pressure Applications

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 Stainless Steel construction, ensuring long-term reliability in harsh environments.
• High tensile strength of 75,000 PSI and Rockwell B96 hardness for dependable performance under heavy loads.
• Precision Class 2A thread fit for smooth installation and secure fastening, reducing assembly time and errors.
• Coarse UNC threading provides quick engagement and superior resistance to vibration loosening.
• Optimized 2 1/4" grip length ensures even load distribution, minimizing stress concentration in critical joints.
• External hex drive design allows for easy torque application with standard tools, enhancing installation efficiency.
• ASTM A193 Grade B8 compliance guarantees material integrity and consistency for high-temperature and pressure applications.

Professional Applications & Engineering Value

This 7/8"-9 UNC hex head screw is engineered to address common industrial challenges, such as corrosion-induced failure and joint instability. Made from 18-8 Stainless Steel, it resists rust and chemical exposure, making it ideal for marine, chemical processing, and outdoor infrastructure applications. The partially threaded design and coarse thread spacing enhance grip and vibration resistance, preventing loosening in dynamic environments. With a 75,000 PSI tensile strength and ASTM A193 Grade B8 certification, it ensures reliable performance in high-stress assemblies, reducing maintenance costs and downtime. The external hex drive and Class 2A thread fit facilitate quick, precise installation, streamlining production workflows.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances for precise engagement and meets UNC thread specifications (7/8"-9). It is manufactured in accordance with ASTM A193 Grade B8 standards, ensuring material quality and performance consistency. The product complies with industry regulations, including RoHS and REACH for environmental safety, and is suitable for applications requiring high strength and corrosion resistance. Dimensions include a 4 1/4" length, 2" thread length, and 2 1/4" grip length, providing reliable fastening in inch-system assemblies.