S-90420A681 1/4"-20 x 2" Tapping Screws

Key Features & Benefits at a Glance

• Eliminates pre-drilling requirements with integrated drilling tip that penetrates up to 1/2" thickness in steel and sheet metal
• Superior corrosion resistance through galvanic-barrier coated 18-8 stainless steel construction for harsh industrial environments
• Enhanced load distribution with 0.52" flange diameter providing superior clamping force and vibration resistance
• Reliable thread formation using UNC coarse threading that creates strong, permanent threads in base materials
• Easy installation and removal with external hex drive design allowing high torque application with standard tools
• Full-length engagement capability with completely threaded shank for maximum holding power across the entire length
• 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 metal fabrication and industrial assembly. The galvanic-barrier coated 18-8 stainless steel construction prevents galvanic corrosion when joining dissimilar metals, while the thread forming design creates precisely mated threads without generating chips or debris that could compromise electrical systems or moving components. The integrated No. 5 drilling tip eliminates secondary drilling operations, significantly reducing assembly time and labor costs in high-volume production environments. Ideal for sheet metal assemblies, electrical enclosures, and structural steel connections, these CSD tapping screws maintain integrity in vibration-prone applications where loosening could cause equipment failure.

Specification Summary & Compliance

This thread forming tapping screw features 1/4"-20 UNC coarse threads with standard Class 2A tolerances, ensuring consistent performance and interchangeability. The external hex drive and flanged head design conforms to industrial fastening standards, while the galvanic-barrier coating on 18-8 stainless steel provides enhanced corrosion protection beyond standard finishes. Manufactured to meet industry specifications for thread forming fasteners, this product is RoHS and REACH compliant for use in regulated environments. The 2" length and fully threaded configuration delivers optimal performance across the specified 1/2" maximum drilling thickness in steel, stainless steel, and sheet metal applications.