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Engineered for demanding structural applications, the Zinc Plated Countersunk (CSK) Flat Head Self Drilling Screw with 6 Ribs represents a highly efficient fastening solution. Manufactured from premium high-strength C1022 carbon steel with advanced surface hardening—or available in highly corrosion-resistant A2/A4 stainless steel—these fasteners deliver exceptional tensile strength and structural integrity. The unique all-in-one architecture combines a razor-sharp drill point, efficient cutting wings, and a ribbed countersunk head.
This intelligent design allows the screw to drill its own pilot hole, evacuate metal shavings, tap precise threads, and seat itself perfectly flush in a single, fluid motion. Coated with a premium zinc finish, they offer a long-lasting defense against environmental moisture and oxidation, presenting a clean, white or white-blue metallic gleam. Every batch is rigorously manufactured to comply with DIN 7504, DIN 7982 C, and ASTM C1513 international standards, ensuring reliable engineering quality and strict compliance for critical construction projects.
By eliminating the need for pre-drilling pilot holes, these ribbed self-drilling screws save significant time and physical effort during large-scale installations. The sharp drill-shaped point bites instantly into materials like sheet metal or timber, producing a continuous, clean shaving as it penetrates. This efficient cutting action creates a tight, secure thread without requiring tool changeovers.
The 6 strategically placed ribs under the countersunk head act as miniature router bits. As the head meets the material surface, the ribs carve a precise conical recess, allowing for a perfectly flush fit. This design maximizes surface contact, creating a robust connection that actively resists loosening even when subjected to intense mechanical vibrations or structural shifting.
Merging drilling, tapping, and countersinking into one rapid operation drastically reduces the time spent on each fastening point. For expansive construction or assembly lines, this accelerated installation process directly translates to lower labor costs and faster project turnaround times, maximizing overall operational efficiency.
Selecting the correct fastener requires precise technical data to ensure structural integrity and project compliance. The table below outlines the exact specifications, material finishes, and dimensional standards for our ribbed self-drilling screws. From the reliable cross groove design to the versatile packaging options, every parameter is tightly controlled. Our manufacturing facilities maintain a production capacity of 6,000 tons annually, guaranteeing that even the largest bulk requirements are met with consistent precision. Review the detailed specifications below to confirm compatibility with your specific engineering demands.
| Groove | Cross |
| Head Style | CounterSunk |
| Standard | DIN, GB, ANSI, BSW, JIS |
| Colour | White,White-Blue |
| Delivery | 30days,45days,60days,Follow Customer Wishes |
| Finish | Zinc |
| Transport Package | Bulk, Bag, Box, Plastic Barrel |
| Specification | 3.5, 3.9, 4.2, 4.8, 5.5, 6.3 |
| Trademark | Donghuang, OEM |
| Origin | Zhejiang, china |
| HS Code | 731814 |
| Production Capacity | 6000tons/Year |
These screws are perfectly suited for attaching wooden components, such as timber decking or plywood panels, to steel frames. The cutting wings ream a slightly larger hole in the wood, preventing the threads from engaging prematurely before the drill point firmly penetrates the metal substrate below.
When a perfectly flat, unobstructed surface is mandatory, the 6 ribs under the screw head effortlessly mill away the top layer of the material as the screw is driven in. This creates a precise countersunk hole, allowing the head to sit completely flush with the surface without splitting the material.
For visible joints where appearance matters, the metallic gleam of the zinc plating combined with the ability to create a flush, clean finish ensures a professional look. Running a hand over the assembled joint reveals no sharp edges or protruding screw heads.
Securing galvanized steel ducts requires airtight, vibration-proof joints. The self-drilling mechanism ensures a tight seal, while the zinc coating protects against the condensation and moisture frequently encountered in HVAC systems.
Used extensively in the assembly of steel furniture, the ribs help create a neat, flush finish that prevents snagging on clothing or skin, while securely fastening the metal components together for long-term durability.
These fasteners are relied upon in various heavy-duty construction applications, including roofing. They effectively fasten metal roofing sheets to wooden or metal supports, withstanding thermal expansion and high wind loads.
Material Compatibility: Choose a screw with a drill point and thread type suitable for the specific material thickness you are joining. Ensure the C1022 carbon steel or stainless steel variant aligns with your environmental exposure needs.
Rib Design: Consider the rib design and its effectiveness for the material. The 6-rib structure is specifically engineered to cut through harder surface layers to allow a flush seat.
Length: Ensure the screw is long enough to fully penetrate the base material and provide at least three full threads of engagement past the substrate, but not so long that it protrudes excessively and causes a safety hazard.
Mark the drilling point: Clearly mark the exact location on the material where the fastener needs to be inserted to maintain structural symmetry.
Ensure proper alignment: Hold the fastener strictly perpendicular to the surface. The sharp point provides immediate tactile feedback, preventing the screw from wandering before the driver is engaged.
Engage the driver: Use a professional-grade power drill with a compatible cross-head adapter designed for self-drilling screws.
Apply initial pressure: Start with steady, light pressure to allow the drill point to pierce the metal. You will feel the initial resistance give way smoothly. Gradually increase pressure as the screw begins to thread.
Drive the screw: Continue driving until the ribbed head mills the surface and sits fully flush. Avoid overtightening, which can strip the freshly tapped threads or damage the substrate.
Drill Speed: Adjust the RPM to match the material hardness and screw diameter. Too high a speed can burn out the drill point, while too low a speed makes penetration difficult and fatiguing.
Lubrication: When working with exceptionally thick or hard metals, applying a cutting fluid can reduce friction, preserve the drill point, and ensure smoother insertion.
Pull-out Resistance: While the precise thread design maximizes pull-out resistance, verifying that the clutch on your power tool is set correctly will prevent over-torquing and ensure the joint's integrity.
A: Yes, Self-Drilling Screws and Tek Screws are terms often used interchangeably in the construction industry. "Tek" was originally a brand name that became synonymous with the drill-point fastener design.
A: Self-drilling screws feature an integrated drill point that completely eliminates the need for a pilot hole, cutting its own path through metal. In contrast, self-tapping screws only form threads and strictly require a pre-drilled hole when used in hard materials.
A: Choose the screw size based on the combined thickness of the materials being joined. The unthreaded drill point must completely clear the materials before the first thread engages to prevent the materials from being forced apart.
A: While they can be physically removed, it is highly recommended not to reuse a self-drilling screw. The drilling point and threads experience wear during the initial installation, which compromises their holding power and cutting efficiency upon a second use.
A: Yes, provided they have the correct protective coating. For outdoor environments, opt for our zinc-plated finishes, which offer strong rust defense, or upgrade to our A2/A4 stainless steel variants for maximum long-term durability against harsh weather conditions.
To support large-scale engineering projects and specialized procurement demands, we provide comprehensive manufacturing and customization services that ensure your exact specifications are met with precision and reliability.
Operating with a robust daily manufacturing capacity of 80 to 100 tons, we guarantee stable, on-time delivery for high-volume orders. We accommodate diverse logistical requirements by offering flexible packaging solutions, including bulk cartons, small retail boxes, durable bags, and heavy-duty plastic barrels.
We fully support non-standard engineering needs through our OEM customization program. Clients can request specific thread dimensions, extended lengths, and specialized protective coatings such as yellow zinc or black oxide. Additionally, we provide custom-branded packaging to align with your corporate identity.
To completely eliminate procurement risks, we offer free standard samples for preliminary evaluation. Our in-house laboratory conducts stringent quality control tests on every batch, including pull-out force assessments, drill penetration speed tests, and salt spray corrosion evaluations, ensuring every fastener performs flawlessly under pressure.
