S-90420A684 1/4"-20 x 8" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and galvanic-barrier coating for extended service life in harsh environments
• Eliminates pre-drilling requirements with integrated steel drilling tip that penetrates up to 1/2" thickness in steel and sheet metal
• Enhanced grip and load distribution from the flanged hex head design that prevents pull-through and maintains clamping force
• Reliable thread formation through UNC coarse threading and thread-forming design that creates strong, permanent threads in base materials
• Optimized for industrial applications with right-hand thread direction and external hex drive for secure installation with standard tools
• Material compatibility specifically engineered for use in steel, stainless steel, and sheet metal applications
• Partial threading design provides unthreaded shank section for improved shear strength and alignment in assembled components

Professional Applications & Engineering Value

These galvanic-barrier coated stainless steel tapping screws deliver exceptional engineering value by solving critical installation challenges in industrial fastening. The combination of 18-8 stainless steel material and specialized coating provides superior protection against galvanic corrosion when joining dissimilar metals, while the integrated drilling tip eliminates the time and cost associated with pre-drilling operations. The thread forming design creates precise, strong threads in base materials without generating chips, making these hex head flanged screws ideal for applications requiring vibration resistance and repeated disassembly. With UNC coarse threading and external hex drive, these fasteners ensure reliable performance in steel frameworks, stainless steel equipment, and sheet metal assemblies across manufacturing, construction, and industrial maintenance sectors.

Specification Summary & Compliance

This 1/4"-20 tapping screw features precision UNC coarse threading with standard thread tolerances and partial threading configuration. The fastener meets industry standards for CSD tapping screw types and incorporates a No. 5 drill tip with specified maximum drilling capacity of 1/2". Manufacturing complies with relevant industrial fastening specifications, and the galvanic-barrier coating on 18-8 stainless steel provides enhanced environmental protection while maintaining compliance with RoHS and REACH requirements for industrial components.