S-92198A485 5/8"-18 x 2 1/2" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 18-8 stainless steel material, ideal for harsh industrial environments and outdoor applications.
• High tensile strength of 80,000 psi provides reliable load-bearing capacity and structural integrity for demanding mechanical assemblies.
• Rockwell B70 hardness ensures excellent wear resistance and durability, reducing fastener failure and maintenance needs.
• Fine UNF thread spacing offers superior vibration resistance and precise clamping force in critical machinery and equipment.
• Class 2A thread fit guarantees smooth assembly and interchangeability, speeding up installation and reducing labor costs.
• External hex drive design allows for high-torque application with standard tools, ensuring secure fastening in heavy-duty applications.
• Partial threading provides unthreaded shank strength where needed, optimizing grip and shear resistance in structural connections.

Professional Applications & Engineering Value

This 5/8"-18 UNF hex head screw is engineered to solve critical challenges in industrial settings where corrosion, vibration, and high stress are common. The 18-8 stainless steel construction delivers outstanding resistance to rust and chemical exposure, making it suitable for marine, chemical processing, and food industry equipment. Its fine thread spacing and Class 2A thread fit ensure tight, secure fastening that withstands dynamic loads and vibrations in machinery, automotive assemblies, and construction frameworks. The partially threaded design enhances shear strength along the unthreaded portion, providing reliable performance in bolted joints subject to lateral forces. With an external hex drive, it facilitates quick installation and removal using common wrenches, reducing downtime in maintenance and assembly lines.

Specification Summary & Compliance

This fastener meets ASME B18.2.1 dimensional standards, ensuring precise thread fit Class 2A and consistent performance. It is manufactured in the inch system with a UNF thread type, right-hand direction, and fine thread spacing. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms its environmental safety and suitability for global industrial supply chains.