S-90420A650 1/4"-20 x 1" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with galvanic-barrier coated 18-8 stainless steel construction, ideal for harsh industrial environments.
• Efficient thread forming action creates strong, permanent threads in materials without chips, reducing assembly time.
• Integrated drilling tip (No. 3) eliminates the need for pre-drilling, enabling faster installation in steel, stainless steel, and sheet metal up to 0.21" thick.
• External hex drive and flanged head design provides high torque capability and a larger bearing surface for secure, vibration-resistant fastening.
• Coarse UNC thread (1/4"-20) ensures quick engagement and reliable performance in a wide range of materials.
• Fully threaded shank offers maximum grip length and holding power across the entire fastener.
• Right-hand thread direction conforms to standard assembly practices for straightforward, efficient installation.

Professional Applications & Engineering Value

This thread forming tapping screw is engineered to solve critical assembly challenges in metalworking and fabrication. The galvanic-barrier coated 18-8 stainless steel material prevents galvanic corrosion when used with dissimilar metals, extending the service life of the assembly. Its CSD type design with a drilling tip allows for direct installation into steel, stainless steel, and sheet metal without pilot holes, significantly reducing labor and production time. The external hex drive facilitates high-torque application with standard tools, ensuring a tight, secure fit that resists loosening under vibration. This makes it an indispensable fastener for HVAC systems, automotive panels, electrical enclosures, and machinery where durability and speed of assembly are paramount.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with standard right-hand direction, conforming to common thread standards for reliable interchangeability. The thread forming (tapping) method ensures precise fit. Manufactured from 18-8 stainless steel with a specialized galvanic-barrier coating for enhanced performance. The product is designed to meet industry specifications for such tapping screws and is compliant with relevant material and safety standards, including RoHS and REACH, ensuring environmental and user safety.