S-90420A659 1/4"-20 x 2" Tapping Screws

Key Features & Benefits at a Glance

• Corrosion-resistant performance with galvanic-barrier coated 18-8 stainless steel construction, ideal for harsh industrial environments
• Self-drilling capability with integrated steel tip eliminates pre-drilling, saving labor time and reducing installation steps
• Maximum material penetration with 0.21" drilling capacity for reliable fastening in steel, stainless steel, and sheet metal
• Enhanced grip and stability from the flanged design that distributes load evenly and prevents pull-through
• Thread-forming efficiency creates strong, permanent threads in base materials without chip removal
• Quick installation with external hex drive that provides superior torque transmission and tool compatibility
• Full-thread engagement along the 2" length ensures maximum holding power across the entire fastener

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/4"-20 UNC flanged tapping screws solve critical fastening challenges in steel, stainless steel, and sheet metal assemblies. The galvanic-barrier coated 18-8 stainless steel construction provides exceptional corrosion resistance where dissimilar metals meet, preventing galvanic corrosion in structural applications. The self-drilling tip with No. 3 geometry penetrates up to 0.21" thickness, eliminating separate drilling operations and reducing installation time by up to 50%. The thread forming design creates precise, cold-formed threads that provide superior resistance to vibration loosening compared to cut threads. These CSD tapping screws with external hex drive are particularly valuable in construction, HVAC, and metal fabrication where speed, durability, and corrosion resistance are paramount.

Specification Summary & Compliance

Manufactured to precise UNC coarse thread specifications with 1/4"-20 thread size and Class 2A thread tolerances for consistent performance. The thread forming tapping method complies with industry standards for CSD type screws. The galvanic-barrier coating on 18-8 stainless steel provides enhanced corrosion protection while maintaining compliance with RoHS and REACH environmental standards. The external hex drive and flanged design meet industrial fastening requirements for torque transmission and load distribution in structural applications.