S-90429A112 0-80 x 5/8" 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 guarantees tight, secure connections with minimal backlash, ideal for applications requiring exact alignment.
• Black-oxide coating on alloy steel provides superior corrosion resistance and a durable, non-reflective finish for extended service life.
• Fully threaded design with fine UNF spacing offers maximum grip and vibration resistance in thin materials or tight spaces.
• 82° countersink angle and flat head profile allow for a flush, low-profile installation, enhancing aesthetics and safety.
• Hex drive (0.035") enables easy installation and removal with standard tools, improving assembly efficiency.
• High Rockwell C39 hardness ensures excellent wear resistance and durability in demanding industrial environments.

Professional Applications & Engineering Value

Engineered for precision and reliability, these 0-80 UNF flat head screws in black-oxide alloy steel address critical challenges in industrial assembly. The fine thread spacing and Class 3A thread fit provide superior holding power in applications where vibration loosening is a concern, such as electronics enclosures, machinery components, and automotive systems. The fully threaded design ensures consistent clamping force across the entire length, while the 82° countersink angle facilitates seamless integration into tapered holes, preventing protrusions that could interfere with moving parts. With a tensile strength of 130,000 PSI and robust Rockwell C39 hardness, these screws withstand heavy loads and repetitive stress, making them ideal for high-performance precision fasteners in aerospace, manufacturing, and instrumentation sectors.

Specification Summary & Compliance

This 0-80 UNF flat head screw features precise Class 3A thread fit per UNF standards, ensuring dimensional accuracy and interchangeability. Manufactured in compliance with ASME B18.3 and ASTM F835 specifications, it meets rigorous engineering requirements for mechanical properties and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances.