S-98164A518 1/4"-20 x 7/16" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• High-strength fastening with 70,000 psi tensile strength and Rockwell B55 hardness, ensuring reliable load-bearing capacity.
• Precise thread engagement via Class 3A fit and UNC coarse thread, reducing cross-threading risks and improving assembly efficiency.
• Secure torque application with 5/32" hex drive and rounded button head design, preventing cam-out and providing a flush finish.
• Full threading along the 7/16" length for maximum grip and uniform stress distribution in connected materials.
• Compliance with ASME B18.3, RoHS 3, and REACH standards, guaranteeing safety, environmental responsibility, and interoperability.
• Durable performance in corrosive settings due to material properties and finish, extending service life in chemical or marine applications.

Professional Applications & Engineering Value

This 1/4"-20 UNC rounded head screw in 316 stainless steel addresses critical challenges in demanding sectors like chemical processing, marine equipment, and food machinery, where exposure to moisture, salts, and chemicals is common. The passivated finish enhances the innate corrosion resistance of the material, preventing premature failure and reducing maintenance costs. With a coarse thread and Class 3A fit, it ensures quick, reliable installation even in vibration-prone setups, minimizing the risk of loosening. The hex drive and button head profile allow for tight spaces and high-torque applications, providing a secure, low-profile fastening solution that meets rigorous industrial fastener standards for safety and durability.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC coarse threading with a 1/4"-20 size. It conforms to ASME B18.3 specifications for consistent performance and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.