SELF-TAPPING SCREW MANUFACTURER IN CHINA
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.
Specification:
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 treatment | Black 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 |
| ApplianceL | Furniture 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.
| Inspect Item | Detail |
|---|---|
| Dimensional Inspection | Critical dimensions such as bolt diameter, head width, head height, bolt length and thread length are checked using calibrated measuring equipment. Inspection is carried out according to the applicable dimensional standard or customer drawings to ensure consistent fit and interchangeability. |
| Thread Inspection | External threads are inspected using calibrated GO and NO-GO thread gauges to verify thread profile, pitch and dimensional conformity. Additional measurements can be performed when tighter thread tolerances or specific customer requirements apply. |
| Mechanical Testing | Mechanical properties are verified according to the specified material and strength grade. Depending on the applicable standard, testing may include tensile strength, yield strength, hardness and other required mechanical tests, with test results documented in the relevant inspection or material reports. |
| Surface & Coating Inspection | Bolt surfaces are inspected for appearance, defects, coating uniformity and other specified requirements. For coated fasteners, coating thickness and adhesion or other applicable coating characteristics can be checked according to the specified surface treatment standard. |
| Final Inspection & Testing | Before shipment, finished hex bolts undergo final inspection to confirm dimensions, thread quality, mechanical requirements, surface condition, marking and packaging. Inspection records and test reports can be provided according to the order specification and customer requirements. |