Flat Head Double Thread Self Drilling Screw

Our Flat Head Double Thread Self Drilling Screw are common fasteners, widely used in construction, furniture manufacturing and other fields due to their unique design and excellent performance.

Structural Features

1.Flat Head Design: The screw head is flat. After installation, the surface is relatively smooth, providing a large contact area to evenly distribute stress on the connected parts. With a neat and attractive appearance, it is suitable for occasions requiring high surface flatness.

2.Double-Thread Design: Compared with single-thread screws, double-thread screws have a larger lead angle under the same pitch, enabling faster screwing speed and higher efficiency. Meanwhile, they offer better self-locking performance for a more stable connection.

3.Self-Drilling Tail Design: The screw tail is shaped like a twist drill bit. It can drill holes, tap threads and fasten in materials like metal and wood without pre-drilling, which greatly improves construction efficiency.

Material & Surface Treatment

1.Material: Usually made of high-quality carbon steel or stainless steel. Carbon steel screws feature high strength and toughness at a relatively low cost; stainless steel screws have good corrosion resistance, ideal for humid, acidic or alkaline corrosive environments.

2.Surface Treatment: To enhance corrosion resistance and appearance, surface treatment is usually applied. Common methods include electroplating such as galvanizing and nickel plating, which can effectively prevent the screws from rusting.

Specifications & Sizes

1.Thread Specifications: Common sizes include M3, M4, M5, M4.2, M4.8, with the diameter generally ranging from 3.5mm to 6.3mm.

2.Length Specifications: Lengths vary from several millimeters to tens of millimeters, such as 13mm, 16mm, 19mm, 25mm, 32mm, to meet the connection needs of materials of different thicknesses.

Application Scenarios

1.Furniture Assembly: In furniture manufacturing, it can be used to connect various wooden components like bed frames, cabinets and tables, quickly and firmly fixing the parts together.

2.Wall Decoration: In home decoration, it is applicable for fixing gypsum boards, ceramic tiles, decorative strips, etc., ensuring they are tightly attached to the wall.

3.Electrical Appliance Maintenance: When repairing or replacing household appliances such as TV brackets and computer cases, flat head double-thread self-drilling screws can be used for disassembling or installing parts.

Installation Method

1.Prepare Tools: A Phillips screwdriver or electric screwdriver is generally required.

2.Select Screws: Choose screws of appropriate size and material based on the material and thickness of the connected parts.

3.Drill & Screw In: Align the self-drilling tail with the target position, then directly use a screwdriver or electric tool to screw it in. The screw will drill a hole, tap threads automatically and tighten in place.