S-90420A769 1/4"-20 x 4" Wood Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with galvanic barrier coated 18-8 stainless steel construction, ensuring long-term reliability in humid or outdoor environments
• Enhanced material penetration through specialized drill tip design, reducing pilot hole requirements and speeding up installation in wood and sheet metal
• Optimized thread engagement with UNC coarse threading and 1-1/2" minimum thread length, providing maximum pull-out strength and vibration resistance
• Secure flush mounting with undercut flat head profile, preventing surface protrusion while maintaining structural integrity
• Efficient installation using Phillips No. 3 drive system, offering reliable torque transfer and reduced cam-out during high-torque applications
• Versatile application capability with thread forming design, creating strong permanent threads in various materials without pre-tapping
• Precise dimensional control with 0.48" head diameter and 4" overall length, ensuring consistent performance across multiple fastening points

Professional Applications & Engineering Value

These 1/4"-20 UNC thread wood screws deliver exceptional engineering value through their galvanic barrier coated 18-8 stainless steel composition, specifically engineered to combat galvanic corrosion in mixed-material assemblies. The partially threaded design with thread forming capability eliminates the need for separate tapping operations, significantly reducing assembly time in sheet metal and wood applications. The undercut flat head profile ensures complete flush mounting without compromising the material surface, while the specialized drilling tip penetrates tough materials with minimal effort. This combination addresses critical industrial pain points including installation efficiency, material compatibility, and long-term structural integrity in construction, woodworking, and metal fabrication projects where vibration resistance and corrosion protection are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with UNC coarse thread spacing and Class 2A thread tolerances for reliable fit. Features a 0.48" head diameter, 4" overall length, and 1-1/2" minimum thread engagement. The thread forming design follows industry-standard manufacturing practices, while the 18-8 stainless steel composition with galvanic barrier coating ensures compliance with corrosion resistance requirements. Suitable for applications requiring robust fastening solutions in wood and sheet metal assemblies.