S-90821A610 1/4"-20 x 1" Tapping Screws

Key Features & Benefits at a Glance

• Eliminates pre-drilling requirements with integrated No. 4 self-drilling tip that penetrates up to 0.236" thickness in aluminum and sheet metal
• Superior corrosion resistance provided by galvanic barrier coated 18-8 stainless steel construction for extended service life in harsh environments
• Enhanced torque transmission through external hex drive design ensures secure installation and prevents stripping during high-torque applications
• Increased bearing surface area with 0.52" flange diameter distributes clamping force evenly, reducing material stress and improving joint integrity
• Reliable thread formation through CSD thread forming design creates strong, vibration-resistant threads in ductile materials without chip removal
• Full 1" threading provides maximum engagement length for superior pull-out resistance in thin-section materials
• Industry-standard UNC coarse thread (1/4"-20) ensures compatibility with existing tooling and faster installation in production environments

Professional Applications & Engineering Value

This thread forming tapping screw delivers exceptional engineering value in aluminum and sheet metal applications where traditional fastening methods fall short. The galvanic barrier coated 18-8 stainless steel construction provides outstanding corrosion resistance while the self-drilling No. 4 tip eliminates the time-consuming pre-drilling process, significantly reducing assembly time and labor costs. The CSD thread forming design creates stronger, more durable threads by displacing material rather than removing it, resulting in improved resistance to vibration loosening. The combination of external hex drive for superior torque transmission and the integrated flange for distributed load bearing makes this flanged screw ideal for high-stress applications in HVAC systems, electronic enclosures, automotive components, and industrial equipment where reliability is paramount.

Specification Summary & Compliance

This 1/4"-20 UNC coarse thread tapping screw features precision Class 2A thread tolerances and fully threaded design for consistent performance. Manufactured to industry standards for thread forming screws, the product utilizes right-hand thread direction and round shank cross-section for optimal functionality. The galvanic barrier coating on 18-8 stainless steel provides enhanced corrosion protection while maintaining compliance with industrial fastening specifications. The screw's dimensional accuracy, including 1" length, 3/8" head width, and 0.52" flange diameter, ensures reliable performance in demanding aluminum and sheet metal applications where precision fastening is critical.