S-90273A429 1/4"-20 x 6" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-lasting performance in harsh industrial environments
• Exceptional tensile strength rated at 60,000 psi for reliable load-bearing capacity in demanding applications
• Precise flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Optimized drive engagement through Phillips No. 3 drive system, reducing cam-out risks during installation
• Enhanced thread reliability with UNC coarse threading and Class 2A fit, providing secure fastening in various materials
• Versatile partial threading design allowing unthreaded shank sections for improved shear strength alignment
• Full regulatory compliance meeting ASME B18.6.3 specifications plus RoHS 3 and REACH environmental standards

Professional Applications & Engineering Value

These zinc-plated steel flat head screws deliver critical engineering solutions for industrial assembly challenges. The 1/4"-20 UNC coarse thread configuration ensures rapid installation and superior holding power in metal, wood, and composite materials, while the partial threading design prevents material splitting in delicate applications. The 82° countersink angle provides optimal flush seating in predrilled holes, eliminating protrusions in machinery and equipment surfaces. With Rockwell B70 hardness and robust zinc plating, these Phillips drive screws maintain integrity in high-vibration environments, making them ideal for manufacturing equipment, structural frameworks, and maintenance operations where durable fastening solutions are paramount.

Specification Summary & Compliance

This flat head screw features precise Class 2A thread fit tolerances and UNC coarse thread spacing per standardized dimensions. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across industrial sectors. The 6" length with 1 1/2" minimum thread length provides consistent engagement depth for reliable fastening applications.