Sheet Metal Screws #14 x 2-1/2" Coarse Thread Hex 30-ct - Teks 21356 Achieve fast, secure, and reliable fastening in metal applications with the Teks 21356 Self-Drilling Hex Washer Head Sheet Metal Screw. Designed for professionals and DIYers alike, this 2-1/2-inch screw features a #14 coarse thread and a precision-engineered self-drilling, self-tapping point that effortlessly penetrates light to heavy gauge metal?eliminating the need for pre-drilling and significantly reducing installation time. Packaged in a 30-piece clamshell pack, these screws are ideal for a wide range of construction and industrial applications. Constructed from high-strength steel with a corrosion-resistant zinc plating, the Teks 21356 offers long-lasting durability and protection against rust and environmental wear. The silver-gray zinc finish ensures a clean, professional appearance while maintaining performance in both indoor and outdoor environments. The coarse thread design provides superior grip and holding power, minimizing loosening due to vibration and thermal movement. The 3/8" hex washer head combines high torque capability with a built-in washer to distribute load and prevent pull-through, reducing the risk of damage to thin metal sheets. The drive surface is optimized to reduce cam-out during installation, allowing for smooth, consistent driving with standard hex bits and power tools. This feature enhances efficiency and reduces operator fatigue, especially during high-volume installations. Engineered with a self-drilling Type 3 point, these screws pierce through steel framing, ductwork, and metal accessories with ease, creating a clean hole and forming strong, permanent threads in a single step. The self-tapping action ensures a tight, secure fit that maintains structural integrity and improves joint strength. Ideal for use in residential steel frame construction, HVAC ductwork, and mounting electrical accessories to metal studs. With a total length of 2-1/2 inches and SAE measurement standard, these screws are compatible with standard U.S. construction practices and tools. Their interior/exterior suitability makes them a versatile choice for projects exposed to moisture, temperature fluctuations, and mechanical stress. Features - #14 x 2-1/2" self-drilling, self-tapping sheet metal screw for fast, one-step installation - Eliminates need for pre-drilling?penetrates light to heavy gauge metal with ease - Coarse thread design provides strong holding power and resistance to vibration - 3/8" hex washer head reduces cam-out and prevents pull-through during installation - Integrated washer distributes load and improves clamp force - Zinc-plated steel construction offers corrosion resistance and long-term durability - Silver finish blends well in industrial and residential settings - Ideal for steel framing, ductwork, and electrical mounting applications - Suitable for both interior and exterior use in demanding environments - Pack of 30 for medium to large-scale projects Specifications - Brand Name: Teks - Model Name: Teks 21356 - Part Number: 21356 - UPC: Not specified - UNSPSC: 31161500 - Product Type: Sheet Metal Screws - Fastener Type: Screw - Primary Material: Steel - Fastener/Connector Material: Steel - Fastener Plating: Zinc - Finish: Zinc - Finish Family: Gray - Color: Silver - Head Style: Hex Washer Head - Screw Head Style: Hex - Drive Style: Hex - Drive Size: 3/8" - Thread Size: #14 - Diameter: #14 - Thread Type: Coarse - Fastener Thread Style: Coarse - Length: 2-1/2 inches - Product Length (in.): 2.5 - Point Type: Self-Drilling, Self-Tapping - Self Drilling: Yes - Self Tapping: Yes - Application: Residential steel frame construction, duct work to steel framing, electrical accessories to steel framing - Applicable Materials: Metal - Indoor or Outdoor: Indoor and Outdoor - Interior or Exterior: Interior/Exterior - Packaging Type: Clamshell - Number in Package: 30 pk - Package Quantity: 30 pk - Pack Size: 30 - Each Weight: 1.000 lb - Product Dimensions: Width 3.50", Height 5.25", Length 2.5" - Measurement Standard: SAE - ECCN: EAR99 - Manufacturer: Teks - Country of Origin: China Product Application The Teks 21356 Self-Drilling Sheet Metal Screw is designed for high-performance fastening in metal-to-metal applications across residential, commercial, and industrial settings. Commonly used in steel frame construction, HVAC duct installation, and securing electrical components to metal studs, these screws deliver strong, vibration-resistant connections without pre-drilling. Their corrosion-resistant finish and durable construction ensure long-term reliability in both dry and humid environments. With efficient installation and excellent holding power, they are a trusted choice for contractors and builders seeking speed, strength, and consistency in demanding metal fastening tasks.