S-90273A434 5/16"-18 x 1 3/4" 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
• High tensile strength of 60,000 psi ensures reliable fastening under significant mechanical stress
• Rockwell B70 hardness provides excellent durability and resistance to wear during installation and use
• Fully threaded design offers maximum grip and holding power across the entire fastener length
• 82° countersink angle enables flush mounting for clean, professional finishes in assembled products
• Class 2A thread fit guarantees smooth installation while maintaining secure fastening integrity
• Phillips No. 4 drive ensures efficient torque transfer and reduces cam-out during installation

Professional Applications & Engineering Value

These zinc-plated steel flat head screws deliver exceptional performance in industrial assembly applications where corrosion resistance and structural integrity are paramount. The combination of UNC coarse threading and Class 2A tolerance provides rapid installation with reduced cross-threading risk, while the 82° countersink creates seamless surface transitions in metal fabrication, machinery, and equipment manufacturing. The fully threaded design ensures maximum engagement in various material thicknesses, making these Phillips drive screws ideal for production lines requiring consistent, reliable fastening solutions. With 60,000 psi tensile strength, they withstand vibration and dynamic loads in automotive, construction, and industrial machinery applications.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with UNC thread form and Class 2A thread fit for precise dimensional accuracy. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features standard 82° countersink angle, right-hand threading, and inch system measurements throughout.