S-90429A144 3/4"-16 x 2 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel prolongs service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, enhancing joint integrity.
• Fully threaded design allows for maximum grip and load distribution along the entire length, ideal for heavy-duty fastening.
• 82° countersink angle and flat head enable flush mounting for a smooth surface finish, improving safety and aesthetics.
• 1/2" hex drive facilitates easy installation and removal with standard tools, speeding up assembly processes.
• Compliance with ASME B18.3 and ASTM F835 ensures adherence to industry standards for consistent quality and reliability.

Professional Applications & Engineering Value

This 3/4"-16 UNF flat head screw is engineered to address critical challenges in industrial settings, such as vibration loosening and corrosion-induced degradation. Crafted from black-oxide alloy steel, it offers enhanced durability and resistance to wear, making it suitable for machinery, automotive, and construction applications where high tensile strength and longevity are paramount. The fine thread spacing and Class 3A thread fit provide superior clamping force and stability, reducing the need for frequent retightening. Its fully threaded configuration ensures even stress distribution, while the 82° countersink angle allows for seamless integration into components, minimizing protrusions and improving operational safety. Ideal for heavy-duty fasteners in structural assemblies, this screw delivers reliable performance under extreme loads.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNF fine thread specifications. It meets ASME B18.3 and ASTM F835 manufacturing guidelines, ensuring consistent quality. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety requirements in industrial use.