S-92198A489 5/8"-18 x 3 1/2" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments.
• High tensile strength of 80,000 psi ensures reliable, heavy-duty clamping force and joint integrity.
• Class 2A thread fit provides consistent, easy assembly while maintaining secure fastening.
• External hex drive and hex head design allows for high-torque installation with standard tools.
• Fine UNF thread spacing offers improved vibration resistance and precise adjustment in critical applications.
• Partial threading provides an unthreaded shank for enhanced shear strength and alignment.
• Compliance with ASME B18.2.1, RoHS 3, and REACH guarantees quality, safety, and environmental standards are met.

Professional Applications & Engineering Value

This 5/8"-18 UNF hex head screw in 18-8 stainless steel is engineered to address common industrial challenges such as corrosion, vibration loosening, and high-stress demands. The fine thread spacing and Class 2A thread fit ensure tight, secure connections in machinery, structural assemblies, and equipment subjected to dynamic loads. Its partially threaded design maximizes clamping force and resists shear, making it ideal for applications requiring precise alignment and durability. With 80,000 psi tensile strength and Rockwell B70 hardness, this external hex drive fastener delivers long-term performance in manufacturing, construction, and marine environments where reliability is critical.

Specification Summary & Compliance

This hex head screw features a Class 2A thread fit per UNF standards, ensuring dimensional accuracy and interchangeability. It is manufactured to meet ASME B18.2.1 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements for industrial use.