Countersunk Head Self-Tapping Screws
Product Overview
This product is a US standard #8GA square-drive countersunk self-tapping screw, made of SS304 (A2) austenitic stainless steel, with standard available lengths covering the full range from 12mm to 50mm. Manufactured in accordance with US standard ASME B18.6.3 for self-tapping screws. Featuring a Robertson square drive recess combined with an 80° tapered countersunk head and full-thread sharp self-tapping point, it can be directly driven into wood, plastic, thin aluminum, and other substrates without the need for pre-tapping. The stainless steel substrate is passivated with no electroplated coating, presenting a bright, clean metallic finish with excellent corrosion resistance. It is a versatile fastening accessory suitable for furniture, timber structures, and decorative panel assembly in both domestic and international markets, particularly well-suited for export to European and American markets.
Product Applications
Panel-Type & Solid Wood Furniture: Assembly of wardrobes, kitchen cabinets, and export furniture – compatible with European and American assembly tools, combining secure fastening with aesthetic appeal.
Outdoor Timber Structures: Preservation-treated wood walkways, garden fencing, and balcony wood components – suitable for long-term outdoor use with minimal corrosion.
Home Decoration Projects: Fastening decorative panels, aluminum composite panels, PVC boards, and panels in humid areas such as kitchens and bathrooms – preventing rust stains from marring finished surfaces.
Light-Duty Component Assembly: Fastening of thin aluminum sheets, plastic enclosures, and small hardware components – suitable for building materials and light equipment assembly.
Product Features
304 Stainless Steel – Rust & Corrosion Resistant: A2 austenitic stainless steel features an inherent passive oxide layer for rust protection. Resists rusting in humid indoor environments and outdoor rain exposure, with no risk of zinc coating flaking or contamination of panels. Offers good toughness and resists breakage during driving.
Square Drive – Resists Stripping: The square recess provides tight engagement with driver bits, capable of handling high torque loads. Suitable for both manual and automated assembly. More wear-resistant than Phillips recesses, with better resistance to loosening under long-term vibration, and improved installation efficiency.
US Countersunk Head – Flush Installation: The 80° tapered countersunk head sits completely flush with the panel surface after tightening, with no protrusions, ensuring a clean and tidy finished appearance.
#8GA Coarse Thread – Strong Holding Power: Standard 4.17mm wire diameter with sharp, wide-pitch threads for secure engagement and high pull-out resistance. Available in multiple lengths from 12–50mm, suitable for both thin decorative panels and thick timber.
Sharp-Point Self-Tapping – Labor-Saving Installation: The sharp cutting point allows direct driving into panels; for softwoods, pre-drilling is not required, simplifying the installation process.
| Material | 304 stainless steel |
| Surface treatment | Pickled and passivated |
| Head type | Countersunk head |
| Slot type | Square recess |
| Thread type | Full thread |
| Screw diameter | Approx. 4.2mm |
| Screw length | Optional (12mm to 50mm) |
| Screw type | Self-tapping screw |
| Corrosion resistance | High (suitable for humid, outdoor, and mildly acidic/alkaline environments) |
| Applicable tools | Square bit or power tools |

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malingfei@linghongscrew.com

No. 56, Baishizhan Road, Economic Development Zone, Langxi County, Xuancheng City, Anhui Province, China
