S-90273A298 12-24 x 1 1/4" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable heavy-duty applications
• Maximum thread engagement through full threading design ensures superior fastening integrity and vibration resistance
• Precision countersinking capability with 82° flat head profile for flush mounting and clean aesthetic finishes
• Optimized drive efficiency with No. 3 Phillips drive for secure tool engagement and reduced cam-out risk
• Reliable thread compatibility with Class 2A UNC coarse threads ensuring smooth installation and consistent performance
• Broad industrial compliance meeting ASME B18.6.3 specifications for guaranteed dimensional accuracy and quality

Professional Applications & Engineering Value

These zinc-plated steel flat head screws deliver critical engineering advantages for industrial assembly applications where corrosion resistance and structural integrity are paramount. The combination of 60,000 psi tensile strength and Rockwell B70 hardness provides exceptional resistance to shear forces and material fatigue, making them ideal for machinery, equipment manufacturing, and structural frameworks. The fully threaded 12-24 UNC coarse thread design ensures maximum grip length and superior load distribution, while the 82° countersink angle enables seamless flush mounting in precision applications. The zinc plating offers sacrificial protection against oxidation, significantly extending service life in humid or chemically aggressive environments where standard fasteners would rapidly degrade.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 dimensional standards with Class 2A thread fit tolerances for consistent installation performance. These 1-1/4" flat head Phillips screws feature UNC coarse threads with 12-24 thread size and right-hand thread direction. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across various industrial sectors without hazardous substance restrictions.