S-90821A613 1/4"-20 x 1 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
- Superior corrosion resistance with galvanic barrier coated 18-8 stainless steel, ideal for harsh environments and extended service life
- Efficient installation and secure hold thanks to the external hex head and flange design, preventing loosening under vibration
- Self-drilling tip eliminates pre-drilling, saving time and labor by penetrating up to 0.236" thick aluminum and sheet metal
- Strong, reliable thread-forming action with UNC coarse threads that create durable, high-strength connections in ductile materials
- Full threading for maximum grip length, ensuring consistent clamping force along the entire 1-1/2" shaft
- Wide material compatibility, specifically engineered for use in aluminum and sheet metal applications
- Standardized UNC 1/4"-20 thread for easy replacement and compatibility with common industrial components
Professional Applications & Engineering Value
This heavy-duty tapping screw is engineered to solve common fastening challenges in aluminum and sheet metal fabrication. The thread-forming UNC design creates strong, strip-resistant threads without requiring a pre-tapped hole, reducing assembly steps and potential errors. Made from 18-8 stainless steel with a galvanic barrier coating, it offers exceptional protection against galvanic corrosion when joining dissimilar metals. The combination of a self-drilling tip (No. 4 type) and flanged hex head allows for quick installation with standard tools, providing a secure, vibration-resistant connection ideal for HVAC, enclosures, and structural metalwork where durability and speed are critical.
Specification Summary & Compliance
This 1/4"-20 UNC coarse thread screw adheres to standard dimensional tolerances (Class 2A) for reliable interchangeability. The thread-forming (CSD type) design follows industry-accepted principles for creating strong internal threads in ductile materials. Manufactured from compliant 18-8 stainless steel, this fastener is suitable for applications requiring good corrosion resistance and mechanical strength. The product is produced under quality systems that ensure consistency and performance for industrial and construction uses.
