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25Pcs #12 X 3/4" Serrated Flange Hex Washer Head Sheet Metal Screws, Zinc PlateDescription Thread Size 0.21" (5.42mm) Item Weight 4.8 ounces Thread Coverage Fully Threaded Fastener Size #12 x 3/4" Size Name #12 x 3/4" (Silver) Item Diameter 0.31 inches Number of Pieces 25 Outside Diameter 0.31 inches Material Type Carbon Steel Exterior Finish Zinc Finish Types Zinc Plated Screw Head Style Hex Screw Point Style Self-Drill Point Head Type Flange Thread Style Right Hand Drive System External Hex Color Silver Fastener Type Self-Tapping Screw Unit Count 25 Count Set Name 25pc Serrated Flange Hex Washer Head Sheet Metal Screws Model FE-FLZW-BLUE-M5.5-19-25PS Number Of Items 25 Part Number FE-FLZW-BLUE-M5.5-19-25PS Material Carbon Steel Head Style Hex Point Style Self-Drill Point

Product description

• Do I need to pre-drill holes before using these screws?

  Self tapping screws are designed to form threads as they go in, while screws can also cut their own pilot hole in suitable thin metal. If the listing says self drilling screws for metal, use a drill bit at controlled speed and test on scrap material.

• Can I use these on metal roofing panels?

  For metal roofing, use correctly sized screws and confirm washer inclusion. Since buyers prioritize sealing, pull-out, and corrosion resistance, do not imply waterproof performance unless washers and coatings support it.

• Can I use these for deck boards?

  For deck boards, choose screws designed for outdoor wood movement and corrosion. If this product is mainly for sheet metal, state it clearly and do not present it as a replacement for 3-inch deck or exterior wood screws.

• Will these fit cabinets or furniture repair?

  For cabinet screws, mounting screws, and small screws used in furniture hardware, size and head profile matter more than generic screw type. If the head is too tall or the thread is too aggressive, it may not sit flush in hinges or brackets.

• Can these replace wood screws?

  Not always. Wood screws bite into fibers, while metal self-tapping screws are optimized for sheet metal. For wood screw projects, match the thread type and length to the wood thickness.

• Can I use these for gutters?

  For gutter screws, check the head diameter, washer requirement, and corrosion resistance. General sheet metal screws may fasten thin metal, but gutter installations often need weather-resistant screws with the right head and sealing setup.

• Are these the same as self tappers?

  Many shoppers say self tappers or self tapper screws when they mean screws that cut threads into the base material. The product page should still explain the actual function, material, and compatible surfaces instead of relying only on slang.

• What drive type should I use?

  Use the specified drive type, such as Phillips, hex head, or Torx. Hex heads are preferred for stronger driver engagement, while Torx reduces cam-out when matched with the right bit.

• Are these good for DIY home repair?

  They can be useful for DIY repairs when the size and material match the job. A small screws or tiny screws buyer may be fixing brackets, panels, or appliances, but the listing should show exact sizes so customers do not buy screws that are too large.

• Are these suitable for aluminum?

  They may work for aluminum only if the screw size, point, and material are suitable for that alloy and thickness. For self tapping screws for aluminum, avoid overtightening because softer metal can strip more easily.

• PRODUCT NAME - 25Pcs #12 Serrated hex washer head self tapping screws. Thread Diameter: 0.21"(5.42mm); Screw Length: 0.75"(19mm); Thread Pitch: 0.043" (1.1mm); Head Diameter: 0.31" (8mm), Head Height: 0.23"(5.8mm). These sheet metal screws ommonly used in steel, aluminum.
• MATERIAL - Zinc-Plated Steel. These hex washer head screws are precision-engineered for exceptional durability, featuring widened threads and deep grooves that provide a secure hold in garage door hinges, brackets, and sheet metal applications. The zinc-plated finish offers reliable corrosion resistance, while the hexagonal self-tapping design delivers maximum torque strength—preventing head stripping even under heavy-duty loads.
• Effortless Installation Without Pre-Drilling - Featuring a sharp point and tapered drill tip, these self-piercing screws easily penetrate steel, aluminum, or PVC. The tight threads form instant, secure bonds, reducing installation time by up to 50% compared to standard screws—perfect for quick and reliable fastening in DIY and professional projects.
• SERRATED HEX WASHER HEAD DESIGN - These screws securely grip the surface upon installation, minimizing slippage and ensuring a stable hold. Ideal for high-vibration applications such as garage doors or metal roofing installations, they deliver long-lasting performance. Featuring advanced thread-cutting technology, these self-piercing screws form clean, debris-free threads in steel, aluminum, or PVC—providing a tight, professional fit with every use.
• 【AFTER SALE SERVICE】 MYWISH team aims to provide our customers with a professional service. Dedicated to promptly solving any concerns or queries. Please contact us if you have any issues with the products.

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