S-96660A174 5/16"-18 x 1/2" Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc plating on alloy steel, extending service life in harsh environments
• Precise thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
• Enhanced installation efficiency through 3/16" hex drive design allowing high-torque application without stripping
• Increased bearing surface from wide button head profile and flange, distributing clamp load effectively
• Optimized for rapid assembly with coarse UNC threads enabling quick installation in various materials
• Full threading versatility allowing installation at any point along the screw's 1/2" length

Professional Applications & Engineering Value

These zinc-plated alloy steel rounded head screws deliver critical engineering solutions where vibration resistance, corrosion protection, and high clamp loads are essential. The Class 3A thread fit maintains precise tolerances for secure fastening in machinery, equipment frames, and structural assemblies subject to dynamic loads. The combination of 120,000 psi tensile strength and Rockwell C32 hardness ensures reliable performance in heavy-duty industrial applications while the wide button head profile with integrated flange eliminates the need for separate washers, streamlining assembly processes. The coarse UNC thread design provides excellent holding power in both metallic and non-metallic materials, making these fully threaded screws ideal for manufacturing, automotive, and construction applications where durability and compliance matter.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit per UNC specifications, ensuring consistent performance and interchangeability. The 5/16"-18 UNC coarse thread with right-hand direction provides optimal engagement characteristics. These screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for hazardous substance restrictions. The combination of alloy steel construction with zinc plating delivers both mechanical performance and corrosion protection in industrial environments.