S-90279A079 2-56 x 3/8" ASME B18.6.3 Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Enhanced Corrosion Resistance: Zinc-plated steel construction provides reliable protection against rust and environmental degradation, extending service life in industrial settings.
• Superior Tensile Strength: 60,000 PSI tensile strength ensures high load-bearing capacity and resistance to mechanical failure in demanding applications.
• Optimized Thread Engagement: Coarse UNC threads with Class 2A fit offer quick assembly and secure fastening, reducing installation time and improving joint reliability.
• User-Friendly Installation: Phillips No. 1 drive and rounded head design enable efficient driving with standard tools, minimizing cam-out and operator fatigue.
• Full Thread Coverage: Fully threaded 3/8" length maximizes grip and clamping force across the entire fastener, providing uniform stress distribution.
• Material Durability: Rockwell B69 hardness ensures excellent wear resistance and maintains thread integrity under repeated use and vibration.
• Broad Industrial Compliance: Meets ASME B18.6.3, RoHS 3, and REACH standards, ensuring quality, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

These zinc-plated steel rounded head screws are engineered to address critical challenges in industrial assembly, such as vibration loosening and corrosion-induced failure. The 2-56 UNC coarse thread design, combined with a Class 2A thread fit, ensures rapid and precise installation in metal, plastic, and composite materials, reducing assembly errors and downtime. The Phillips drive and rounded head profile facilitate secure tool engagement, making them ideal for automated or high-volume production lines. With a 60,000 PSI tensile strength and full threading, these screws provide consistent clamping force in electronics enclosures, machinery panels, and automotive components, where reliability and regulatory compliance are paramount. Their zinc plating offers an economical yet effective barrier against moisture and chemicals, enhancing longevity in harsh operational environments.

Specification Summary & Compliance

This screw maintains Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. Manufacturing adheres to ASME B18.6.3 specifications for consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances and supporting sustainable procurement practices.