S-92198A490 5/8"-18 x 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 reducing maintenance costs.
• High tensile strength of 80,000 psi ensures reliable load-bearing capacity and mechanical integrity under demanding conditions.
• Fine UNF thread design provides enhanced grip and vibration resistance, minimizing loosening in precision assemblies.
• Class 2A thread fit offers consistent, easy installation while maintaining secure fastening without galling.
• External hex drive and hex head allow for straightforward tool engagement and high torque application, speeding up assembly processes.
• Partially threaded shank concentrates strength where needed, improving fatigue resistance and alignment in structural applications.
• Rockwell B70 hardness delivers excellent durability and wear resistance, extending service life in repetitive use scenarios.

Professional Applications & Engineering Value

This 5/8"-18 UNF hex head screw is engineered to address common industrial challenges such as corrosion-induced failure and assembly inefficiencies. Crafted from 18-8 Stainless Steel, it provides robust protection against rust and chemical exposure, making it suitable for outdoor, marine, and chemical processing equipment. The fine thread and Class 2A fit ensure precise engagement in UNF threaded components, reducing the risk of cross-threading and enhancing joint stability. With a partially threaded design, it optimizes stress distribution, preventing shear failures in heavy-duty applications like machinery frames, construction supports, and transportation systems. This screw’s external hex drive facilitates quick installation with standard tools, streamlining maintenance and reducing downtime in industrial hex screw applications where reliability and compliance are critical.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 2A thread fit for consistent tolerance and UNF fine thread specifications. It meets ASME B18.2.1 manufacturing guidelines, ensuring interoperability and safety in mechanical systems. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting environmentally responsible procurement for global industrial use.