S-90429A135 7/16"-14 x 3 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – 130,000 psi rating ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior Corrosion Resistance – Black-oxide coating on alloy steel provides enhanced durability and protection against rust, extending service life in harsh environments.
• Precision Thread Fit – Class 3A thread specifications offer tighter tolerances for smoother assembly and improved vibration resistance, minimizing loosening over time.
• Optimized Head Design – Flat head with 82° countersink angle allows for flush mounting, creating a clean, secure finish that prevents snagging and improves safety.
• Robust Material Hardness – Rockwell C39 hardness ensures high wear resistance and durability, maintaining integrity through repeated use and heavy loads.
• Efficient Hex Drive – 1/4" hex drive enables quick, secure installation with standard tools, reducing assembly time and improving workflow efficiency.
• Regulatory Compliance – Meets ASME B18.3, ASTM F835, RoHS 3, and REACH standards, ensuring environmental safety and adherence to industrial specifications.

Professional Applications & Engineering Value

This 7/16"-14 UNC flat head hex drive screw is engineered to address critical challenges in heavy-duty industrial assemblies. The black-oxide alloy steel construction, combined with a Rockwell C39 hardness and 130,000 psi tensile strength, provides exceptional resistance to mechanical stress and environmental factors, making it ideal for applications in machinery, automotive, and construction sectors where reliability is paramount. The partially threaded design and Class 3A thread fit ensure precise engagement and reduced risk of cross-threading, while the 82° countersink angle facilitates seamless integration into components, eliminating protrusions and enhancing structural integrity. By utilizing these screws, engineers can achieve faster, more secure installations that withstand vibration and heavy loads, ultimately improving assembly longevity and reducing maintenance costs.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit for high precision and is manufactured in accordance with ASME B18.3 and ASTM F835 standards. It features a coarse UNC thread with a diameter of 0.438" and a minimum thread length of 1 3/8", ensuring consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for global industrial use.