S-91355A161 6-32 x 3/8" Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• High tensile strength of 120,000 psi ensures reliable fastening under significant mechanical stress and vibration.
• Precise Class 3A UNC thread fit provides excellent engagement and reduces the risk of cross-threading during assembly.
• Integrated flange design eliminates the need for a separate washer, simplifying installation and providing a larger bearing surface.
• Hex drive (5/64") allows for high-torque application with common tools, minimizing slippage and tool wear.
• Fully threaded coarse UNC pattern enables faster installation and stronger holding power in a variety of materials.
• Compliance with RoHS 3 and REACH ensures the screw meets strict international environmental and safety regulations.

Professional Applications & Engineering Value

This black-oxide alloy steel screw is engineered to address common failure points in assembly lines and heavy-duty equipment. The rounded button head with an integrated flange distributes clamp load effectively, preventing surface damage and maintaining joint integrity under dynamic loads. Its Class 3A UNC coarse thread and fully threaded design ensure rapid, secure fastening in metals and plastics, reducing assembly time. The combination of Rockwell C32 hardness and high tensile strength makes it ideal for industrial applications like machinery, automotive sub-assemblies, and electronic enclosures where vibration resistance and long-term reliability are critical.

Specification Summary & Compliance

This screw conforms to UNC thread standards with a Class 3A fit for precision and a coarse thread spacing. It is manufactured from alloy steel and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of restricted hazardous substances. Dimensions include a 6-32 thread size, 3/8" length, and 0.297" flange diameter.