S-91306A423 3/8"-16 x 1 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 PSI ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies.
• Hex drive design (7/32") allows for high-torque installation with common tools, speeding up assembly and reducing labor time.
• Fully threaded coarse (UNC) design offers maximum grip and holding power across the entire length for robust fastening.
• High hardness (Rockwell C39) resists wear and deformation, maintaining fastener integrity under repeated stress.
• Rounded button head profile provides a finished appearance and reduces snagging, ideal for applications where a low-profile head is preferred.

Professional Applications & Engineering Value

These 3/8"-16 UNC hex drive screws are engineered to solve critical fastening challenges in heavy-duty industrial and construction settings. The combination of zinc-plated alloy steel and Class 3A thread fit ensures a durable, corrosion-resistant fastener that withstands high vibration and load conditions. The coarse thread design is particularly effective in softer materials or where quick assembly is required, preventing cross-threading and ensuring consistent clamping force. The fully threaded construction maximizes engagement in thick materials, providing uniform stress distribution and reducing the likelihood of joint loosening. This makes them an ideal choice for machinery, structural frames, and equipment that demand high tensile strength and long-term reliability under dynamic stresses.

Specification Summary & Compliance

This product features a 3/8"-16 UNC coarse thread with a precision Class 3A thread fit for accurate engagement. It is manufactured to meet ASME B18.3 and ASTM F835 specifications, ensuring dimensional consistency and performance reliability. The screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming they are free of hazardous substances and safe for use in various industrial and consumer applications.