S-98164A916 5/8"-11 x 2 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction and passivated finish, extending service life.
• Exceptional mechanical strength with a 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high stress.
• Precise and secure fastening ensured by the Class 3A thread fit and UNC coarse thread profile, reducing the risk of loosening.
• Efficient installation and removal with the 3/8" hex drive, providing a positive grip for high-torque applications.
• Full threading along the 2 1/2" length offers maximum grip and adjustability in a wide range of material thicknesses.
• Low-profile rounded (button) head design minimizes protrusion for a cleaner finish and reduced snagging risks.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.

Professional Applications & Engineering Value

This 316 Stainless Steel Rounded Head Screw is engineered to solve critical challenges in demanding sectors like chemical processing, marine, and food equipment, where exposure to corrosive agents is a constant threat. The combination of 316 stainless steel and a passivated finish provides an exceptional barrier against pitting and oxidation, significantly reducing maintenance frequency and failure risks. The UNC coarse thread and Class 3A fit ensure rapid assembly and a vibration-resistant connection, which is vital for machinery and structural applications. The hex drive and button head profile allow for high torque application in confined spaces, making it a reliable choice for heavy-duty industrial assemblies that demand both strength and a streamlined appearance.

Specification Summary & Compliance

This screw features a 5/8"-11 UNC thread with a Class 3A precision fit, ensuring high dimensional accuracy and interchangeability. It is fully threaded and manufactured to meet the dimensional specifications of ASME B18.3. The product is confirmed to be compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, adhering to strict environmental and safety standards for industrial components.