S-90279A544 1/4"-20 x 1 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
• Exceptional tensile strength rated at 60,000 PSI for reliable load-bearing performance in structural applications
• Optimized drive engagement with No. 3 Phillips drive for efficient installation and reduced cam-out risks
• Enhanced thread engagement through fully threaded UNC coarse design, providing maximum holding power
• Consistent dimensional accuracy with Class 2A thread fit ensuring precise mating with standard nuts
• Broad industrial compatibility through compliance with ASME B18.6.3 specifications
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable procurement

Professional Applications & Engineering Value

Engineered for industrial assembly and construction applications, these zinc-plated steel screws deliver critical performance advantages where vibration resistance and long-term reliability are paramount. The fully threaded UNC coarse thread design ensures maximum surface contact for superior clamping force distribution, while the rounded head profile with Phillips drive facilitates efficient installation in confined spaces. With 60,000 PSI tensile strength and Rockwell B69 hardness, these fasteners maintain structural integrity under dynamic loads, making them ideal for machinery assembly, metal framing, and equipment manufacturing where Class 2A thread fit precision ensures consistent performance across production runs.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerances for precise dimensional accuracy. Features 1/4"-20 UNC coarse threads with right-hand orientation and full threading along the 1-1/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors.