S-91355A166 8-32 x 5/8" Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional durability with 120,000 psi tensile strength and Rockwell C32 hardness for reliable performance in demanding industrial environments
• Superior torque transmission through the 3/32" hex drive design, ensuring secure fastening and reduced tool slippage
• Enhanced stability and load distribution thanks to the wide flange design and fully threaded construction
• Precision thread engagement with Class 3A fit and 8-32 UNC coarse threads for quick assembly and vibration resistance
• Corrosion-resistant protection from the black-oxide finish, extending service life in various operating conditions
• Right-hand threading for standard installation procedures and compatibility with common industrial equipment
• Regulatory compliance with RoHS 3 and REACH standards, ensuring environmental responsibility and global market acceptance

Professional Applications & Engineering Value

Engineered for industrial applications requiring high-strength fastening solutions, these black-oxide alloy steel rounded button head screws deliver exceptional performance in machinery assembly, automotive components, and electronic enclosures. The 8-32 UNC coarse thread configuration ensures rapid installation and superior resistance to vibrational loosening, while the Class 3A thread fit maintains precise tolerances for critical connections. The flanged design provides increased bearing surface, preventing sinkage into softer materials and distributing clamp load effectively. Combined with the hex drive system's torque efficiency, these screws solve common assembly challenges including stripped heads, insufficient clamping force, and corrosion-induced failure in demanding operational environments.

Specification Summary & Compliance

This rounded button head screw features precision 8-32 UNC coarse threads with Class 3A fit for superior thread engagement and dimensional accuracy. Manufactured from alloy steel with black-oxide surface treatment, the fastener delivers optimal corrosion resistance and extended service life. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring adherence to international standards for hazardous substance restrictions and chemical safety in industrial applications.