S-92198A443 1/2"-20 x 3 1/2" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and outdoor applications.
• Superior mechanical strength offering 80,000 psi tensile strength and Rockwell B70 hardness for reliable, heavy-duty load-bearing performance.
• Optimized fine thread engagement with 1/2"-20 UNF threading providing superior vibration resistance and a more secure, precise fit.
• Efficient installation and removal facilitated by the external hex drive and 3/4" head width, compatible with standard tools for quick assembly.
• Enhanced design versatility from the partially threaded shank, allowing for effective clamping without binding on unthreaded sections.
• Guaranteed dimensional consistency with Class 2A thread fit ensuring reliable interchangeability and ease of assembly in production lines.
• Broad industry compliance meeting ASME B18.2.1 specifications, RoHS 3, and REACH regulations for safe, global use.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Hex Head Screw is engineered to address critical challenges in industrial fastening, including corrosion, high stress, and vibrational loosening. The 1/2"-20 UNF fine thread provides a tighter seal and increased shear strength compared to coarse threads, making it ideal for precision machinery, automotive assemblies, and structural frameworks where vibration resistance is paramount. The partially threaded design ensures that the unthreaded portion bears the load effectively, reducing the risk of thread stripping under tension. Combined with its external hex drive for high-torque application, this screw delivers reliable performance in demanding environments such as marine equipment, chemical processing plants, and construction projects, ensuring long-term integrity and reduced maintenance.

Specification Summary & Compliance

This hex head screw features a 1/2"-20 UNF thread with a Class 2A thread fit for consistent dimensional accuracy and easy assembly. It is manufactured in compliance with ASME B18.2.1 standards, ensuring mechanical and dimensional reliability. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances.