S-90420A662 1/4"-20 x 2 1/2" Tapping Screws
Tapping Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
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Key Features & Benefits at a Glance
- Corrosion-resistant performance with galvanic-barrier coated 18-8 stainless steel construction, ideal for harsh industrial environments.
- Superior holding power provided by the flanged design, distributing load evenly and preventing loosening under vibration.
- Efficient self-drilling capability with a steel tip that penetrates up to 0.21" thickness, eliminating pre-drilling and speeding up assembly.
- Thread-forming design creates strong, permanent threads in steel, stainless steel, and sheet metal for reliable fastening.
- Easy installation and removal with an external hex drive, allowing high torque application with standard tools.
- Wide material compatibility for use in steel, stainless steel, and sheet metal applications, reducing inventory needs.
- Full threading ensures maximum grip along the entire 2 1/2" length, enhancing pull-out resistance.
Professional Applications & Engineering Value
These 1/4-20 UNC flanged hex head tapping screws are engineered to address common challenges in metal fabrication and assembly. The thread forming design eliminates the need for tapped holes, reducing labor and tooling costs while creating robust threads that resist stripping. Made from galvanic-barrier coated 18-8 stainless steel, these screws prevent galvanic corrosion when joining dissimilar metals, extending service life in demanding conditions. The integrated drilling tip (No. 3 type) allows direct penetration into materials up to 0.21" thick, streamlining workflows in steel, stainless steel, and sheet metal applications. The external hex drive and flanged head provide secure, high-torque fastening with added bearing surface, making them ideal for HVAC, automotive, and machinery assemblies where vibration resistance and durability are critical.
Specification Summary & Compliance
These screws feature 1/4"-20 UNC coarse threads with Class 2A tolerance for consistent fit, right-hand thread direction, and fully threaded shank. They comply with CSD tapping screw standards and are manufactured from RoHS and REACH compliant materials. The external hex drive and 0.5" flange diameter ensure reliable performance in industrial fastening applications.
