S-98164A212 1/4"-20 x 5/8" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 316 stainless steel and passivated finish, ideal for harsh environments and chemical exposure
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and joint integrity under stress
• Precise Class 3A thread fit provides secure, vibration-resistant fastening with minimal risk of cross-threading
• Hex drive design allows for easy installation and high torque application with standard tools
• Fully threaded shank offers consistent holding power along the entire 5/8" length for versatile applications
• Rounded button head profile delivers a low-profile, finished appearance while reducing snagging risks
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards for industrial use

Professional Applications & Engineering Value

This 316 stainless steel rounded head screw with 1/4"-20 UNC coarse threads is engineered to address critical industrial challenges, including corrosion, vibration loosening, and high-stress fatigue. The combination of passivated finish and marine-grade stainless steel provides exceptional resistance to chemicals, moisture, and salt spray, making it ideal for marine, chemical processing, and outdoor equipment. The hex drive and Class 3A thread fit ensure precise installation and reliable performance in machinery, enclosures, and structural assemblies, reducing maintenance needs and enhancing operational lifespan in demanding B2B environments.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit for tight tolerances and UNC coarse thread specifications, manufactured per ASME B18.3 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no hazardous substances and meeting global environmental and safety requirements for industrial components.