S-91253A623 3/8"-16 x 7/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional Strength & Durability: With 130,000 psi tensile strength and Rockwell C39 hardness, this screw provides reliable, long-lasting performance in demanding applications.
• Superior Corrosion Resistance: The Black-Oxide Alloy Steel finish offers enhanced protection against rust and wear, extending the fastener's service life.
• Precision Thread Fit: The Class 3A thread fit ensures tighter tolerances and a more secure, vibration-resistant connection compared to standard fits.
• Efficient Installation & High Torque Capability: The hex drive (7/32") allows for easy, high-torque installation with common tools, speeding up assembly processes.
• Optimal Flush Mounting: The standard 82° flat head profile is designed for countersunk applications, creating a smooth, flush surface.
• Wide Industrial Compatibility: Coarse UNC threading (3/8"-16) and full threading provide excellent grip and are ideal for a broad range of materials and industrial uses.
• Regulatory Compliance & Quality Assurance: Manufactured to meet ASTM F835 and compliant with RoHS 3 and REACH standards, ensuring product safety and environmental responsibility.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this 3/8"-16 UNC flat head screw addresses critical needs for strength, reliability, and corrosion resistance. The Black-Oxide Alloy Steel construction provides a durable barrier against harsh environments, reducing maintenance and replacement costs. Its Class 3A thread fit and coarse thread spacing ensure superior holding power and vibration resistance in machinery, structural assemblies, and metal frameworks. The combination of high tensile strength (130,000 psi) and a fully threaded design allows for maximum load distribution and secure fastening in demanding scenarios, from automotive to construction. The hex drive facilitates quick, high-torque installation, enhancing efficiency on the production line while the 82° countersink ensures a clean, flush finish for safety and aesthetics.

Specification Summary & Compliance

This product features a Class 3A thread fit with UNC coarse threading (3/8"-16) and is fully threaded for consistent performance. It is manufactured in compliance with ASTM F835 specifications, ensuring high-quality standards for dimensional accuracy and mechanical properties. The screw also meets critical environmental regulations, being RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free from hazardous substances and safe for various industrial uses.