S-90273A070 2-56 x 1/2" 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
• High tensile strength of 60,000 psi ensures reliable fastening under significant mechanical stress
• Precise Class 2A thread fit provides consistent engagement and reduces cross-threading risks
• Standard 82° countersink angle enables flush mounting for clean, professional finishes
• Full threading design maximizes grip length and load distribution across applications
• Rockwell B70 hardness rating maintains structural integrity through repeated installation cycles
• Phillips No. 1 drive compatibility offers familiar, efficient installation with standard tools

Professional Applications & Engineering Value

These 2-56 UNC flat head screws deliver critical performance where space constraints and surface finish matter. The zinc-plated steel construction provides essential corrosion protection for industrial equipment, electronic enclosures, and machinery assemblies exposed to moderate environmental conditions. The coarse UNC thread profile ensures rapid installation and superior resistance to vibration loosening compared to fine-thread alternatives. With full threading extending the entire 1/2" length, these fasteners maintain consistent clamping force across thin materials and stacked components. The standard 82° countersink angle seamlessly integrates with common chamfered holes, eliminating protrusions that could interfere with moving parts or aesthetic requirements in precision applications.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances ensuring interchangeability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features right-hand UNC coarse threads with 0.086" diameter and standard flat head profile with No. 1 Phillips drive configuration.