S-92655A635 5/8"-11 x 4 1/2" ASTM A193 18-8 Stainless Steel Heavy Hex Head Screws for High-Pressure Applications

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and reducing maintenance costs
• Exceptional mechanical strength with 75,000 psi tensile strength and Rockwell B100 hardness for reliable performance under high stress
• Precise and secure fastening ensured by Class 2A thread fit and UNC coarse threads, minimizing the risk of loosening in vibrating applications
• Optimized load distribution from the 3" grip length and partially threaded design, providing enhanced joint stability
• Easy installation and removal with a standard external hex drive and large 1-1/16" head width, compatible with common tools
• Guaranteed material quality and consistency through compliance with ASTM A193 Grade B8 specifications
• Versatile coarse threading (5/8"-11 UNC) offers quick assembly and is less prone to cross-threading in industrial settings

Professional Applications & Engineering Value

This 5/8"-11 UNC hex head screw is engineered to address critical challenges in heavy-duty industrial applications where reliability and durability are paramount. The 18-8 Stainless Steel material provides excellent resistance to corrosion and oxidation, making it suitable for use in chemical processing, marine environments, and outdoor infrastructure. Its ASTM Grade B8 certification ensures the fastener meets rigorous standards for high-temperature and high-pressure services, such as in pressure vessel assemblies, valve systems, and structural frameworks. The combination of a coarse thread and partial threading allows for efficient installation and optimal clamp load distribution, reducing the risk of thread stripping and joint failure. This external hex drive design facilitates quick tightening with standard wrenches, enhancing productivity in maintenance and assembly operations while maintaining a secure, vibration-resistant connection.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and a UNC coarse thread profile (5/8"-11). It is manufactured in accordance with ASTM A193 specifications, which govern alloy and stainless steel bolting materials for high-temperature service. The product is supplied in the inch system with a total length of 4-1/2", thread length of 1-1/2", and grip length of 3". While specific declarations for RoHS or REACH are not provided in the data, the use of 18-8 Stainless Steel generally supports compliance with common environmental and safety regulations for industrial components.