S-90273A411 2-56 x 1/8" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating for extended service life in demanding industrial environments
• Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening performance
• Precise flush mounting with undercut flat head design and 82° countersink angle for seamless surface integration
• Optimized drive efficiency with Phillips No. 1 drive style ensuring secure installation and reduced cam-out risk
• Consistent thread engagement with Class 2A thread fit and UNC coarse threads for faster assembly and vibration resistance
• Full-threaded design providing maximum grip length and load distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations for global applications

Professional Applications & Engineering Value

These 2-56 UNC flat head screws deliver critical engineering advantages for precision assembly applications where surface flushness and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for electronics, machinery, and automotive components exposed to environmental factors. The undercut flat head profile with 82° countersink angle ensures perfect seating in tapered holes, eliminating protrusion issues while the coarse UNC threads and Class 2A thread fit enable rapid installation in various materials without stripping. With full threading along the 1/8" length, these Phillips drive screws distribute clamping forces evenly, making them ideal for sheet metal assemblies, electrical enclosures, and precision instruments where vibration resistance and reliable fastening are essential.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerance and UNC coarse thread specifications. Fully compliant with ASME B18.6.3 manufacturing standards ensuring dimensional accuracy and performance reliability. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for unrestricted use in global markets. The inch system measurements guarantee compatibility with North American equipment and specifications.