S-90471A452 5/16"-18 x 1 1/2" 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
• High tensile strength of 60,000 psi ensures reliable fastening under substantial mechanical loads
• Rockwell B70 hardness provides excellent durability and resistance to wear during installation and use
• Class 2A thread fit with UNC coarse threading enables quick assembly and secure holding power
• 100° countersink angle and flat head design creates a flush, professional finish when installed
• No. 4 Phillips drive offers familiar, efficient installation with standard tools
• Full threading along the 1-1/2" length maximizes grip and adjustment flexibility in various materials

Professional Applications & Engineering Value

Engineered for industrial assembly and metal fabrication, these zinc-plated steel flat head screws solve critical fastening challenges where flush mounting and high strength are paramount. The UNC coarse thread configuration prevents cross-threading in soft materials while maintaining rapid installation speeds. With 60,000 psi tensile strength and Rockwell B70 hardness, they withstand vibration and shock loads in machinery, electrical enclosures, and structural applications. The 100° countersink angle ensures secure seating in prepared holes, while the zinc plating provides essential corrosion protection for both indoor and outdoor environments, making them ideal for manufacturing facilities, construction projects, and equipment maintenance.

Specification Summary & Compliance

This 5/16"-18 x 1-1/2" flat head screw maintains Class 2A thread tolerance per UNC standards, ensuring consistent fit and performance. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances above threshold limits.