S-90429A128 8-36 x 3/8" 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.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, maintaining secure connections in demanding applications.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for long-term use.
• Hex drive design allows for high-torque installation with standard tools, improving assembly efficiency and reducing stripping risks.
• 82° countersink angle and flat head profile enable flush mounting, creating smooth surfaces and preventing snagging in assembled components.
• Fully threaded fine UNF spacing ensures maximum grip and uniform load distribution across the entire fastener length.
• Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability in regulated industrial environments.

Professional Applications & Engineering Value

This 8-36 UNF Class 3A flat head screw is engineered to address critical challenges in precision assembly and high-vibration environments. The Black-Oxide Alloy Steel construction, combined with a Rockwell C39 hardness, provides exceptional durability against wear and environmental exposure, making it ideal for automotive, aerospace, and heavy machinery applications. The fine thread spacing and fully threaded design enhance clamping force and resistance to loosening, while the hex drive facilitates secure installation in confined spaces. These features collectively solve common issues like thread stripping, corrosion-induced failure, and inconsistent torque application, ensuring reliable performance in industrial screw fastening systems.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit tolerances for precise engagement and is manufactured in accordance with ASME B18.3 and ASTM F835 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material sustainability. The product features a right-hand thread direction, UNF fine thread type, and dimensions in the inch system, providing consistent performance and interchangeability in regulated industrial applications.