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Self Tapping Metal Screws

Cuts Cost, Not Corners

Vibration-Proof. Stay Tight

No Pre-Drilling. Instant Grip.

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    Zinc Plated /Black
    self tapping metal screws

    Cuts Cost, Not Corners

    Vibration-Proof. Stay Tight

    No Pre-Drilling. Instant Grip.

    Get a Quick Qoute

    01

    Sinsun Self-Tapping Metal Screws: Engineered for Superior Fastening in Metal Fabrication & Construction

    Sinsun is a leading manufacturer of high-performance metal tapping screws. Engineered for superior grip, durability, and fast installation in steel, aluminum, and sheet metal. Request free samples & technical specs.

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    black rooging self tapping screw
    color roofing screw
    Galanized Pan Head Zinc Coated Self Tapping Screws
    Countersunk Head Hex Socket Self Tapping screw
    hex head screw
    Round Head Self Tapping Screws
    Stainless Steel Hex Head self drilling screw
    Zinc Plated Steel Self Tapping Sheet Metal Screws
    Galanized Pan Head Zinc Coated Self Tapping Screws
    Countersunk Head Hex Socket Self Tapping screw
    Round Head Self Tapping Screws
    Zinc Plated Steel Self Tapping Sheet Metal Screws

    High-Strength, Reliable Self-Drilling & Thread-Forming Screw Solutions for Steel, Aluminum, and Sheet Metal Applications

    It is critical to use self-tapping metal screws for construction, metal fabrication, and manufacturing to increase assembly efficiency.

    It is possible for threads to be stripped, corrosion to occur, or joints to fail if fasteners are not selected properly. 

    Sinsun Self-Tapping Metal Screw Factory employs advanced wire drawing technology and rigorous process control procedures. 

    The fastening solutions we provide help engineers and procurement managers solve real-world problems—not just sell screws.

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    Sinsun FastenerSinsun: self tapping sheet metal screws Types

    Choose the right screw for your material. Explore Sinsun's types of self-tapping metal screws: self-drilling for steel, thread-forming for aluminum, sheet metal screws & more. Get specs & samples.

    stainless steel self tapping metal screws

    stainless steel self tapping metal screws

    Sinsun stainless steel self-tapping screws are made from 304 or 316 grade stainless steel for high corrosion resistance. They maintain consistent performance in humid, chemical, or outdoor environments without rusting. The most common uses include marine fittings, food processing equipment, and marine hoses. Available in sizes from #4 to 5/16" diameter with various head styles.

    Metal-to-Metal Self-Tapping Screws

    Metal-to-Metal Self-Tapping Screwss

    We heat-treat our metal-to-metal self-tapping screws to make them 45–50 HRC hard. This allows the threads to cut in steel, aluminum, and other metals without having to drill first.Due to the sharp point and optimized flute design, the driving torque can be reduced by up to 20% as compared to standard types.You can use them to make metal framing, electrical enclosures, and machinery guards with thicknesses up to 12 mm.
    sheet metal tapping screws

    sheet metal tapping screws

    Sheet metal screws made by Sinsun have a twin-lead thread that makes them easy to start and reduces the risk of cross-threading.A layer of zinc-aluminum (5–8 μm) protects them from rusting.Most commonly used for appliances, ductwork, and car panels with sheet metal less than 3 mm thick. You can choose between a pan head and a hex washer head for flush or clamped finishes.
    wood to metal self tapping screws

    wood to metal self tapping screws

    These hybrid screws have a rough thread that grips wood and a tip that taps itself into metal. The diameter of the upper wood thread is 10–15% wider than that of the metal thread. This pulls the materials tightly together. Used to hold wooden frames to metal studs, attach wood to steel beams, or put up signs. You can get them with shanks from #8 to 1/4" and lengths from 20mm to 100mm.
    black self tapping screws

    black self tapping screws

    The black phosphate or oxide coating on Sinsun black self-tapping screws is 3–5 μm thick and protects them from mild corrosion and makes them less reflective. The coating also holds onto lubricants, which makes driving easier. Common in car interiors, electronics mounting, and dark-finished metal furniture where looks and low visibility are important. Hardened to 38–42 HRC for threading that works.
    sheet metal screws with rubber washer

    sheet metal screws with rubber washer

    These screws come with a bonded EPDM rubber washer that is 2mm thick and has a Shore A hardness of 70±5. When compressed, it makes a seal that keeps water out. Used for outdoor enclosures, trim for cars, and roofing accessories that need to keep out moisture and vibration. The washer can handle temperatures between -40°C and 120°C without breaking. There are versions with zinc plating and stainless steel.
    self tapping metal roofing screws

    self tapping metal roofing screws

    Sinsun roofing screws come with a big EPDM sealing washer (22–28 mm in diameter) and a coating that doesn't rust (like Al-Zn or PVDF). The drill point is made for roofing sheets that are 0.8 to 1.2 mm thick, and the shank is designed to keep the drill from going too far. The usual lengths are between 25mm and 100mm. They keep a waterproof seal for more than ten years in normal conditions, even when the temperature changes and the sun shines on them.
    countersunk self tapping metal screws

    countersunk self tapping metal screws

    These screws have a 90° flat head that makes them sit flush with the surface of the material. The sharp tapping start and deep countersink make it easy to install in thin metal sheets (1–4mm). Hardened to 40–45 HRC so that the head doesn't strip when you apply the final torque. Used in situations where a smooth finish is needed, like trailer panels, machinery covers and architectural metalwork where fasteners that stick out are not allowed.
    small self tapping metal screws

    small self tapping metal screws

    These screws come in sizes from M2 to #6 and lengths from 4 to 20 mm. They are made for precise use. The very fine thread pitch gives you up to 30% more holding threads per millimetre in thin or fragile materials. Often used to put together electronics, fix small appliances, and make models. You can get them in stainless steel or zinc-plated finishes, and they come in labelled resealable bags for easy storage in the workshop.
    01

    Sinsun Self-Tapping Metal Screws: Technical Specifications Table

    This table outlines the key technical specifications for the primary types of self-tapping screws. All products are manufactured under a controlled ISO 9001 process.

    Stainless Steel Standard tapping thread, sharp point. #4 to 5/16" x 6mm to 100mm Material: 304 or 316 Stainless Steel. Corrosion Resistance: Excellent. Suitable for harsh environments. Hardness: 26-32 HRC.
    Finish: Passivated.
    Metal-to-Metal Spaced thread, flute or serrated point for chip clearance. #6 to 3/8" x 12mm to 150mm Material: High-Carbon Steel. Core Hardness: 45-50 HRC. Capacity: Taps through up to 12mm total steel thickness.
    Finish: Zinc Plated (5-8µm).
    Sheet Metal Fine, twin-lead thread for thin gauge. #4 to #14 x 6mm to 50mm Material: Low-Carbon Steel. Optimal for: Sheets <3mm thick. Feature: Reduced cross-threading risk.
    Finish: Zinc or Zinc-Aluminum coating.
    Wood-to-Metal Hybrid thread: coarse wood bite, self-tapping metal tip. #8 to 1/4" x 20mm to 100mm Material: Hardened Steel. Design: Upper thread diameter ~15% wider for wood pull-up.
    Finish: Zinc or weather-resistant coating.
    Black Finish Standard self-tapping thread. #6 to #14 x 10mm to 75mm Material: Low-Carbon Steel. Hardness: 38-42 HRC. Benefit: Coating retains lubricants, reduces glare.
    Finish: Black Oxide/Phosphate (3-5µm).
    With Rubber Washer Standard sheet metal or tapping thread. #8 to #14 x 12mm to 50mm Material: Steel or Stainless Steel. Seal: Water-resistant. Temp Range: -40°C to 120°C.
    Washer: Bonded EPDM (70±5 Shore A).
    Metal Roofing Special drill point (Tek), washer seat. #12 to 3/8" x 25mm to 100mm Material: High-Strength Steel. Drill Point: For 0.8-1.2mm sheet. Corrosion: >10-year rating.
    Finish: Al-Zn or PVDF coating. Washer: EPDM (22-28mm OD).
    Countersunk Standard thread, 82° or 90° flat head. #6 to #14 x 10mm to 60mm Material: Medium Carbon Steel. Head: Flush finish. Hardness: 40-45 HRC to prevent stripping.
    Finish: Zinc plated or painted.
    Small Precision Fine or standard micro-thread. M2 to #6 x 4mm to 20mm Material: Stainless Steel or Carbon Steel. Use: For thin/ delicate materials. Common in electronics and small assemblies.
    Finish: Plain, Zinc, or Nickel.

    Notes:

    All dimensions are nominal. Tolerance standards apply.

    Mechanical properties (e.g., hardness) are typical ranges and may vary slightly by specific size and grade.

    Disclaimer: This table is for general reference. Always consult official Sinsun technical data sheets for final product specification, validation testing, and application suitability.

    sheet metal tapping screws Application

    self tapping metal screws for steel

    self tapping metal screws for steel

    The drill point on Sinsun self-tapping screws for steel is hardened (up to 52 HRC) and the threads are spaced out.
    They are made to go through steel sheets up to 3.0mm (12 gauge) thick and make threads without needing to be pre-drilled.
    This cuts down on the time it takes to put up steel stud partitions, electrical cabinets, and HVAC ducting by a lot.
    Our high-carbon steel core gives the shear strength we need, and a zinc-aluminum coating makes sure that it won't rust when used indoors.

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    black self tapping screws for metal

    Our black self-tapping screws for metal have a smooth black oxide or phosphate finish that is 3 to 5 microns thick.
    This coating protects against rust to some extent when used indoors.
    It also reduces light reflection and gives the surface a clean, professional look.
    These screws are often used in the assembly of car interiors, mounting electronics, and office furniture.
    They provide a fastening solution that is not very visible.
    The finish also helps with lubrication, which keeps the driving torque steady and lowers the chance of head cam-out.

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    black self tapping screws for metal
    self tapping screws for steel beam

    self tapping screws for steel beam

    These screws are made to connect secondary parts to primary structural steel beams. They have a high tensile strength, usually up to 100 ksi.
    Their sharp, fluted point and aggressive thread form let them cut through paint, mild rust, and steel beams up to 1/4" (6mm) thick.
    They are a better choice than welding or bolting for attaching pipe hangers, electrical conduit straps, and fireproofing channels because they provide a code-compliant, vibration-resistant connection that saves a lot of time.

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    self tapping metal screws for trailer decking

    Sinsun self-tapping screws for trailer decking are built to withstand dynamic loads and weather exposure.
    They feature a large, load-distributing flat washer head and a corrosion-resistant coating like Al-Zn or a heavy zinc layer (minimum 12 µm).
    The sharp, self-drilling point penetrates both hardwood or composite decking boards and the underlying steel cross-members (up to 4mm combined thickness).
    Their deep-cut threads and high clamp force prevent boards from loosening under road vibration, ensuring a secure, long-lasting trailer floor that requires minimal maintenan

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    self tapping metal screws for trailer decking

    Our Advantages

    • Vertical Manufacturing & Customization

      As a factory, we control the entire process from wire rod to packaging. We excel at producing custom self-tapping screw solutions—non-standard sizes, unique head drives, or specialized coatings—to meet your exact blueprint specifications.

    • Rigorous Quality Certification

      Our production follows ISO 9001 standards. We provide material certificates and can supply screws meeting DIN, ANSI, or other international specifications, giving procurement and engineering teams full traceability and confidence.

    • Consistent & Reliable Supply

      Our modern manufacturing lines and in-house logistics ensure stable volume output and on-time delivery, securing your production schedule against fastener shortages.

    • Technical Engineering Support

      Our team provides more than a catalog. We offer technical data sheets, joint design advice, and sample testing to help you select the optimal screw type, size, and finish for your specific material stack-up and performance requirements.

    • Value Through Performance

      We focus on delivering a superior total cost of ownership—reducing your assembly time, minimizing rejection rates, and preventing in-field failures—rather than just competing on initial unit price.

    FAQ

      • 1

        Q: Can I use the same self tapping screws for both metal to wood applications?

        A: For metal to wood connections, we recommend specifically designed self tapping screws metal to wood. Standard metal-to-metal screws may not have the correct thread geometry. Our hybrid-design screws feature a coarse thread for the wood portion and a sharp, self-tapping point for the metal. For example, when attaching a wooden fixture to a steel beam, using a #10 x 2-inch screw of this type typically provides optimal pull-out strength. Using the wrong type can lead to poor grip or material splitting.

      • 2

        Q: When should I choose a self tapping metal screws flat head over other head styles?

        A: Choose self tapping metal screws flat head (also known as countersunk head) when you require a flush or smooth finish surface. This is common in applications like sheet metal fabrication for enclosures, trailer siding, or architectural metalwork where protruding fastener heads are unacceptable. Ensure the material is thick enough to accommodate the countersink. A standard 82-degree flat head is typical, and it requires a correctly sized pilot hole or sufficient driving torque to seat properly.

      • 3

        Q: Do black metal self tapping screws offer any corrosion protection, or is the color just cosmetic?

        A: The finish on our black metal self tapping screws is functional. The black oxide or phosphate coating provides a baseline level of corrosion resistance suitable for interior or dry environments (e.g., indoor furniture, automotive interiors). It forms a mild protective layer and helps retain lubricants for smoother driving. However, for exterior or high-moisture applications, we recommend screws with a hot-dip galvanized or zinc-aluminum coating for superior, long-term rust prevention.

      • 4

        Q: What does the "8" refer to in 8 self tapping sheet metal screws?

        A: The “8” in 8 self tapping sheet metal screws refers to the screw gauge, which is a standard unit for diameter. A #8 screw has a major diameter of approximately 0.164 inches (4.17mm). It is a versatile, medium-duty size commonly used for assembling sheet metal between 0.8mm to 2.0mm thick, such as in HVAC ductwork, electrical boxes, or appliance panels. Always match the gauge and length to your specific material thickness for a secure hold.

      • 5

        Q: What is the main advantage of using hex self tapping metal screws?

        A: The primary advantage of hex self tapping metal screws (with a hexagonal head) is the high torque transmission during installation. The hex head, often combined with a washer, resists cam-out (slipping) significantly better than Phillips or Pozi drive heads. This makes them ideal for high-strength applications, such as attaching metal brackets to steel frames or securing heavy equipment, where a very tight clamp is necessary. They can be driven with a socket wrench or impact driver.

      • 6

        Q: How are self tapping metal deck screws different from standard wood deck screws?

        A: Self tapping metal deck screws are specifically engineered to fasten decking boards (wood or composite) to metal substructures (like steel joists in a trailer or elevated platform). Key differences from standard wood screws include: a harder, self-drilling point to penetrate the metal; a corrosion-resistant coating like Al-Zn; and often a larger, load-distributing washer head. They are not suitable for driving into wooden joists, where a standard wood screw would be more cost-effective.

      • 7

        Q: What is the correct way to install countersunk self tapping screws for metal to achieve a flush finish?

        A: To properly install countersunk self tapping screws for metal and achieve a flush finish: 1) Use a screw with a head angle (typically 82° or 90°) that matches your countersink tool. 2) For thicker or harder metal, a pilot hole may be necessary to guide the screw and form the countersink seat. 3) Apply steady, firm pressure with the driver until the head is fully seated just below or exactly flush with the material surface. Over-torquing can strip the head or deform the surrounding metal.

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