S-90420A655 1/4"-20 x 1 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Eliminates pre-drilling requirements with integrated No. 3 drill tip that penetrates up to 0.21" thickness in steel and sheet metal
• Superior corrosion resistance provided by galvanic-barrier coated 18-8 stainless steel construction for extended service life
• Enhanced load distribution through integrated flange design that prevents pull-through and reduces surface stress
• High-strength thread forming capability with UNC coarse threads that create strong, permanent fastenings in tough materials
• Secure installation and removal enabled by external hex drive design for reliable torque transmission
• Full-thread engagement along the 1½" length ensures maximum holding power in demanding applications
• Material compatibility specifically engineered for steel, stainless steel, and sheet metal applications

Professional Applications & Engineering Value

This 1/4-20 UNC thread forming tapping screw delivers exceptional engineering value by solving critical installation challenges in industrial settings. The galvanic-barrier coated 18-8 stainless steel construction provides outstanding corrosion resistance while the thread forming design creates permanent, high-strength fastenings without requiring tapped holes. The integrated No. 3 drilling tip eliminates the time and cost of pre-drilling operations, making it ideal for high-volume production environments working with steel, stainless steel, and sheet metal. The flanged hex head design combines easy installation with superior clamping force distribution, preventing material deformation and ensuring long-term joint integrity in structural applications and metal fabrication projects.

Specification Summary & Compliance

This CSD tapping screw features precision UNC coarse threads with 1/4"-20 thread size and right-hand thread direction. The fastener maintains standard thread form specifications with fully threaded design along its 1½" length. Manufactured from 18-8 stainless steel with galvanic-barrier coating, the screw meets industry standards for corrosion resistance and mechanical performance. The external hex drive and flanged head design comply with industrial fastening specifications for reliable performance in demanding applications.