S-90273A055 2-56 x 1/4" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through zinc plating for extended service life in demanding industrial environments
• Superior holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening in high-stress applications
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring consistent performance and reduced cross-threading risks
• Optimal flush mounting featuring standard 82° countersink angle and flat head design for seamless surface integration
• Efficient installation with No. 1 Phillips drive providing secure tool engagement and reduced cam-out during assembly
• Full-threaded design maximizing grip length and load distribution across the entire 1/4" fastener length
• Regulatory compliance meeting ASME B18.6.3 specifications for dimensional accuracy and material standards

Professional Applications & Engineering Value

These 2-56 UNC flat head screws deliver critical engineering solutions for industrial assembly challenges. The zinc-plated steel construction provides essential corrosion protection in manufacturing environments where exposure to moisture and chemicals is common. The coarse thread profile ensures rapid installation and superior vibration resistance in machinery, electronic enclosures, and automotive components. With fully threaded right-hand design and standard 82° countersink angle, these screws offer reliable flush mounting for applications requiring smooth surface finishes. The combination of 60,000 psi tensile strength and Rockwell B70 hardness makes them ideal for securing critical components where mechanical stress and load-bearing capacity are primary concerns, while the No. 1 Phillips drive enables efficient high-volume assembly operations.

Specification Summary & Compliance

These flat head screws maintain precise Class 2A thread fit tolerances per UNC standards with 0.086" thread diameter and 1/4" length. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance requirements. The products are fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility in industrial supply chains.