S-90471A419 1/4"-20 x 1 1/4" 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 environments
• High tensile strength (60,000 psi) ensures reliable fastening under significant mechanical stress
• Precise Class 2A thread fit provides smooth installation and consistent clamping force
• Standard 100° countersink angle enables flush mounting for clean, professional finishes
• Full threading along the 1-1/4" length offers maximum grip and adjustment flexibility
• Rockwell B70 hardness rating maintains thread integrity through repeated use
• Phillips No. 3 drive compatibility ensures widespread tool accessibility

Professional Applications & Engineering Value

These zinc-plated steel flat head screws with 1/4-20 UNC coarse threading deliver exceptional performance in industrial assembly and construction applications. The combination of 60,000 psi tensile strength and Rockwell B70 hardness prevents stripping and deformation under vibration and load stress. The standard 100° countersink angle allows for seamless integration into metal frameworks, wood assemblies, and machinery components where flush surface requirements are critical. The fully threaded design ensures maximum engagement depth, making these Phillips drive screws ideal for applications requiring consistent clamping force across the entire fastener length.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread fit for precision tolerance. The 1/4"-20 UNC coarse thread configuration ensures reliable engagement in various materials. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict material compliance standards.