S-92198A389 7/8"-9 x 3 3/4" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and outdoor applications.
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high-stress conditions.
• Secure and efficient installation provided by the external hex drive and 1 5/16" head width, allowing for high torque application with standard tools.
• Optimized load distribution from the coarse UNC thread and Class 2A thread fit, ensuring a precise and vibration-resistant connection.
• Enhanced design flexibility with a partially threaded shank, allowing for unthreaded grip length where needed for specific assembly requirements.
• Long-term reliability backed by compliance with ASME B18.2.1 manufacturing standards, guaranteeing dimensional accuracy and interchangeability.
• Environmental and regulatory safety with RoHS 3 and REACH compliance, making it suitable for use in regulated industries and global markets.

Professional Applications & Engineering Value

This heavy-duty hex head screw is engineered to address critical challenges in industrial assembly and construction. The 18-8 Stainless Steel material provides excellent resistance to rust and oxidation, making it ideal for applications in marine, chemical processing, and outdoor infrastructure where corrosion resistance is paramount. The coarse UNC thread and Class 2A thread fit ensure quick assembly and a secure hold, reducing the risk of loosening under vibration—common in machinery, structural steel frameworks, and heavy equipment. With an external hex drive and large head size, it allows for high torque installation, speeding up assembly times in demanding environments. Its 80,000 psi tensile strength and partial threading offer versatility for joints requiring both clamping force and shear resistance, providing dependable performance in industrial fastening applications.

Specification Summary & Compliance

This screw features a 7/8"-9 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy and ease of assembly. It is manufactured in accordance with ASME B18.2.1 specifications, ensuring consistent quality and interchangeability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances. With a length of 3 3/4" and a minimum thread length of 2", it meets precise engineering requirements for various industrial uses.