S-90429A111 0-80 x 5/16" 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 in high-stress applications, reducing the risk of fastener failure.
• Precise Class 3A thread fit guarantees tighter tolerances and superior engagement, minimizing backlash and improving assembly accuracy.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable, non-reflective finish for long-term use in harsh environments.
• Standard 82° countersink angle allows for a flush, secure fit in countersunk holes, preventing snagging and maintaining a smooth surface profile.
• Hex drive design (0.035") offers efficient torque transmission and easy installation with standard tools, speeding up assembly processes.
• Fully threaded UNF fine thread ensures maximum grip and load distribution along the entire length, enhancing joint stability.
• Compliance with ASME B18.3 and ASTM F835 assures consistent quality and interoperability, meeting rigorous industrial standards.

Professional Applications & Engineering Value

This 0-80 UNF flat head screw is engineered for precision assemblies where space constraints and reliability are critical. The black-oxide alloy steel construction resists corrosion and wear, making it ideal for electronics, aerospace, and automotive components exposed to varying operational stresses. Its fine thread and Class 3A fit provide superior vibration resistance and clamping force, addressing common issues like loosening under dynamic loads. The hex drive and flat head profile facilitate quick, tool-friendly installation in countersunk holes, streamlining production without compromising on the high tensile strength needed for demanding applications.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit for precise UNF threading, with dimensions including a 5/16" length and 0.06" thread diameter. It meets ASME B18.3 and ASTM F835 specifications for dimensional consistency and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence in industrial use.