S-92224A235 1/4"-20 x 3 1/2" ASME B18.6.3 Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black oxide steel coating for longer service life in demanding environments
• Superior holding power from fully threaded UNC coarse thread design that prevents loosening under vibration
• High tensile strength rating of 60,000 psi ensures reliable performance in heavy-duty applications
• Optimized drive engagement with Phillips No. 3 drive for efficient installation and reduced cam-out risk
• Precision thread fit with Class 2A tolerance for smooth assembly and consistent fastening performance
• Durable material hardness at Rockwell B70 maintains structural integrity under repeated stress
• Regulatory compliance meets ASME B18.6.3 standards plus RoHS 3 and REACH environmental regulations

Professional Applications & Engineering Value

These black oxide steel Phillips pan head screws deliver exceptional engineering value for industrial assembly applications where vibration resistance and corrosion protection are critical. The fully threaded UNC coarse thread design provides maximum thread engagement across the entire 3-1/2" length, ensuring superior clamping force in metal fabrication, machinery assembly, and structural frameworks. The rounded pan head profile with Phillips drive offers a low-profile installation solution that combines aesthetic appeal with practical functionality. The black oxide surface treatment creates a protective barrier against oxidation while maintaining dimensional stability, making these screws ideal for automotive components, industrial equipment, and outdoor applications where environmental factors would compromise ordinary fasteners. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures these fasteners maintain their integrity under sustained mechanical stress.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent assembly performance. Features 1/4"-20 UNC coarse threads with right-hand orientation and standard pan head configuration. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The inch system measurement provides precise dimensional control with head diameter of 0.492" and overall length of 3-1/2".