Weld Nuts Supplier in China
Ningbo Teng Qi Fasteners Co., Ltd is a weld nuts supplier in China. Weld nuts are specialized fasteners used to create threaded connections on metal surfaces, particularly in applications where it’s not feasible or practical to use traditional threaded nuts. Weld nuts have a specially designed shape that allows them to be welded to a base material, creating a strong and permanent threaded attachment point.
Here’s how weld nuts work:
1. Design: Weld nuts typically have a flanged or tabbed base with a threaded hole. The base provides a surface to be welded onto the parent material.
2. Welding: The weld nut is positioned on the metal surface where the threaded connection is desired. Heat is applied to the base of the weld nut, melting the metal and fusing it to the parent material.
3. Attachment: Once the weld nut cools and solidifies, it forms a secure threaded attachment point on the metal surface.
Weld nuts are commonly used in applications where there is limited access to the back side of the material (such as when attaching a nut to a metal frame), or when you want to avoid the use of tools or extra fasteners. They are often used in the automotive, construction, and manufacturing industries, where a strong and durable threaded connection is needed.
Specification of Weld Nuts:
| Product Name | Weld Nut |
|---|---|
| Diameter | Metric: M4-M24 |
| Class | 4.8/6.8/8.8/10.9/12.9 A2-70 A2-80 A4-70 A4-80 |
| Grade | SAE J429 GR.2/5/8 |
| Material | Steel/Stainless steel |
| Manufacturing Process | wire drawing, cold heading/hot forging, thread rolling, heat treatment, surface treatment |
| Surface treatment | Black Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating |
| Application Industry | Construction/Agricultural Machinery/Industrial Structures/Equipment and Machinery/Infrastructure |
Manufacturing quality control of weld nut:
| 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. |