Cold heading Service


Ningbo Teng Qi Fasteners Co., Ltd is a leading self tapping screw manufacturer in China. A self-tapping screw is a type of screw designed to create its own threads when driven into a material, such as wood, plastic, or metal, without the need for a pre-drilled hole. This type of screw has a unique thread design that allows it to cut into the material as it is turned, effectively forming threads as it goes in.

Self-tapping screws are commonly used when you need to attach two pieces of material together where you can only access one side of the material. Where you can access both sides you can use either a screw or a bolt.


The specifications of a self-tapping screw can vary based on the type of screw and its intended application. Here are some common specifications you might find when describing a self-tapping screw:

Product Name:Self tapping screw
Thread Diameter:Metric: ST 2.9-ST 6.3
Imperial: 2#-1/2”
Head Type:Hex, flat, oval, round, or countersunk heads.
Material:Steel, Stainless steel
Surface treatmentBlack Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating
Manufacturing Process:wire drawing, cold heading, thread rolling, heat treatment, surface treatment
ApplianceLFurniture Assembly, Cabinetry, Decking, Framing, Trim and Molding, Joinery ,Woodworking Projects, Repair and Restoration ,Woodworking Jigs and Fixtures

Types of self-tapping screws:

1. Countersunk or flat head self-drilling screws: Allows for a flush finish as the head of the screw sits below the surface of the surrounding material. This allows for a flat finish and a smooth result.

2. Allen or socket head self-tapping screws: Less prone to the head of the screw being compromised and distorted when driving into the material, due to the shape of the driver used.

3. Bugle head self-tapping screws: The bugle head screw features a countersunk head with a flat top and a concave bearing face. The shape of the bugle head allows distribution of the stress over a much wider area than is possible with a flat head screw. Bugle headed screws are used to attach plasterboard to wood to metal studs.

4. Button head, dome head and pan self-tapping screws: Typically used in carpentry. Due to the dome shape, there is less chance of the screw head countersinking into the material.

5. Flange head self-tapping screws: Usually used to attach metal to metal or plastic to plastic. The flanged head allows more clamping torque to be applied than other head types.

6. Hex head self-tapping screws: These screws feature a hexagonal head and are typically used by contractors in heavy-duty applications where a countersunk head is not necessary.

7. Wafer head self-tapping screws: Wafer head screws feature a flat top surface and countersunk head. The conical under-head does not extend to the outer edge of the screw head, which allows for a flush fit on wood and other softer materials.

8. Pan head self-tapping screws: The head of this screw is rounded on the top and vertical on the sides. They are similar to oval or round screws. They are typically used in high torque applications into either metal or wood

9. Pancake head self-tapping screws: This screw head is used where a large clamping area & an unobstructed head is required. The larger clamping area allows for the force to be distributed across a wider area.

10. Square head self-tapping screws: Less susceptible to the bit slipping (cam-out) than a traditional Phillips screw when you are driving the screw into the material. Care should be taken to ensure that the screw is not over tightened.

11. Truss head self-tapping screws: This self-tapping screw head is extra wide and has a slightly rounded surface, or top and contains a wider surface area under the head of the screw. Truss head screws are suitable for sheet metal and other material with large diameter holes. Their low-dome shaped head makes tampering with or removing the head difficult.

14. Hex Head Wood Screw: These screws have a hexagonal head requiring a hex wrench or driver for installation. They offer strong torque and are often used in construction and woodworking.

Manufacturing quality control of self-tapping screw:

In a world where connections matter, Ningbo Teng Qi Fasteners is more than just a fasteners supplier and manufacturer. We are architects of stability, builders of relationships, and champions of your success. From skyscrapers that reach for the sky to machines that power industries, our fasteners form the backbone of progress. When you choose Ningbo Teng Qi Fasteners, you choose unwavering quality, exceptional service, and a partner who understands that every bolt holds a piece of your vision.

Control MethodDetail
Material Inspection:Verify the material's composition, heat treatment, and quality upon receipt. Conduct metallurgical analysis to ensure the material properties meet the standards.
Process Control:Implement strict process control measures for heat treatment, machining, threading, and any other manufacturing steps. Maintain consistent process parameters to ensure uniform quality.
Inspection Points:Introduce inspection points at various stages of manufacturing to check for defects, dimensions, and quality. Inspect threading, dimensions, surface finish, and other critical parameters.
Sampling and Testing:Regularly sample products for testing, such as tensile testing, hardness testing, and metallurgical analysis, to ensure they meet the required specifications.
Thread Inspection:Thoroughly inspect threading using proper thread gauges to ensure accurate dimensions and fit with mating components.
Traceability:Implement a traceability system to track each fasteners journey from raw material to final product. This aids in accountability and recalls if necessary.