S-90279A533 1/4"-20 x 1/4" ASME B18.6.3 Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• Excellent thread engagement with Class 2A thread fit ensuring reliable fastening and vibration resistance
• Optimized driving performance through Phillips No. 3 drive design for efficient installation and reduced cam-out
• Enhanced durability with Rockwell B69 hardness providing consistent performance under mechanical stress
• Maximum holding power from fully threaded UNC coarse thread design for superior grip in various materials
• Industry-standard compliance meeting ASME B18.6.3 specifications for guaranteed quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated applications

Professional Applications & Engineering Value

This 1/4-20 UNC zinc-plated steel rounded head screw delivers exceptional engineering value across industrial applications where corrosion resistance and reliable fastening are critical. The zinc-plated steel construction provides essential protection against environmental factors, making it ideal for outdoor equipment, machinery assemblies, and electrical enclosures. The fully threaded coarse UNC thread design ensures maximum holding power in both soft and hard materials, while the Phillips No. 3 drive enables efficient installation with standard tools. With Rockwell B69 hardness and Class 2A thread fit, this fastener maintains structural integrity under vibration and load stress, solving common loosening issues in dynamic industrial environments. The rounded head profile distributes clamping force evenly, preventing surface damage in finished assemblies.

Specification Summary & Compliance

This industrial screw maintains precise Class 2A thread fit tolerances with 1/4"-20 UNC coarse threads and right-hand threading. Manufactured to ASME B18.6.3 specifications for dimensional accuracy and performance reliability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across regulated industries. Features include 0.25" thread diameter, 1/4" length, and fully threaded design for consistent fastening performance.