S-92198A438 1/2"-20 x 2 1/4" 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 environments and reducing replacement frequency.
• High tensile strength of 80,000 psi ensures reliable load-bearing capacity and joint integrity under stress.
• Fine UNF threading (1/2"-20) provides more threads per inch for a tighter, more vibration-resistant connection.
• Class 2A thread fit offers consistent, free-spinning assembly for efficient installation and reduced risk of cross-threading.
• External hex drive and hex head design allows for high torque application with standard tools, speeding up assembly and disassembly.
• Partially threaded shank ensures the unthreaded portion bears against the material for enhanced clamping force and shear strength.
• Rockwell B70 hardness provides excellent wear resistance, maintaining thread form and drive integrity over repeated use.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Hex Head Screw is engineered to address common industrial challenges such as vibration loosening, corrosion-induced failure, and assembly inefficiency. The 1/2"-20 UNF fine thread configuration delivers superior holding power in dynamic applications, from heavy machinery to structural frameworks, by distributing load more evenly. The external hex drive facilitates quick, high-torque fastening with common wrenches, reducing labor time in maintenance and production lines. Its partially threaded design maximizes clamping force on the unthreaded shank, preventing joint slippage in high-stress scenarios. Ideal for industrial applications requiring corrosion-resistant screws, this fastener ensures long-term reliability in demanding settings like marine, chemical processing, and outdoor equipment.

Specification Summary & Compliance

This screw adheres to ASME B18.2.1 manufacturing standards, ensuring dimensional accuracy and interchangeability. The Class 2A thread fit provides consistent tolerance for easy assembly, while the 1/2"-20 UNF fine thread and 2 1/4" length meet precise engineering requirements. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing the absence of hazardous substances for safe use in global markets.