S-90066A321 Length 2 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding industrial environments
• Enhanced vibration resistance and sealing through integrated steel/rubber flat washer that prevents loosening under dynamic loads
• Efficient thread forming action creates strong, permanent threads in sheet metal without chip removal
• High-torque installation capability with external hex drive design for secure fastening in confined spaces
• Full-length threading ensures maximum grip strength and load distribution along the entire fastener length
• Precision compatibility with standard 5.5mm drill bits for streamlined installation processes
• Optimized for thin materials with specialized design for maximum 0.025" sheet metal thickness applications

Professional Applications & Engineering Value

These No. 14-10 thread forming screws deliver exceptional value in sheet metal fabrication and assembly operations. The zinc-plated steel construction provides reliable corrosion protection in industrial settings, while the A/AB tapping screw type with thread forming design eliminates the need for separate tapping operations, reducing installation time and labor costs. The integrated steel/rubber flat washer serves dual purposes: the steel component distributes clamping force evenly to prevent material deformation, while the rubber element dampens vibrations and creates a weather-resistant seal. With fully threaded design and right-hand thread direction, these fasteners maintain consistent holding power throughout the entire engagement length, making them ideal for HVAC systems, electrical enclosures, and automotive panel applications where vibration resistance and long-term reliability are critical.

Specification Summary & Compliance

This No. 14 tapping screw features precision 10 threads per inch with 0.242" thread diameter and 2-1/2" length in compliance with standard inch measurement specifications. The fastener meets industry standards for thread forming screws with external hex drive configuration and pointed tip for easy starting. The 5/8" OD flat washer combines steel structural integrity with rubber sealing properties. Manufactured to meet industrial fastening requirements with compatibility for 5.5mm drill bit size (0.2165" diameter) and maximum drilling thickness of 0.025" sheet metal. Complies with relevant industrial standards for material composition and performance characteristics.