S-90273A427 1/4"-20 x 2 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, extending service life in demanding environments
• Exceptional tensile strength rated at 60,000 PSI for reliable performance under heavy loads and vibration
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced driving efficiency through Phillips No. 3 drive system, reducing cam-out and tool slippage
• Reliable coarse threading with UNC 1/4"-20 pattern and Class 2A fit for quick assembly and secure fastening
• Partial threading design providing superior clamping force in wood and metal applications
• Industry compliance assurance meeting ASME B18.6.3 specifications for dimensional accuracy and performance

Professional Applications & Engineering Value

These zinc-plated steel flat head screws deliver critical engineering solutions for industrial assembly challenges. The combination of Rockwell B70 hardness and 60,000 PSI tensile strength ensures reliable performance in high-stress applications where fastener failure is not an option. The UNC coarse threading with Class 2A fit provides rapid installation in various materials while maintaining secure connections. The 82° countersink angle and flat head profile create flush surfaces essential for machinery, automotive components, and structural assemblies where protrusions would interfere with operation. The partial threading design maximizes clamping force, making these Phillips drive screws ideal for wood-to-metal fastening, equipment manufacturing, and maintenance applications requiring vibration resistance and long-term reliability.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance ensuring consistent performance across applications. Complies with ASME B18.6.3 specifications for mechanical properties and dimensional requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for restricted substances. Features UNC coarse threading (1/4"-20) with right-hand direction and partial threading extending to minimum 1-1/2" length.