Cold heading Service


Ningbo Teng Qi Fasteners Co., Ltd is a leading flange nuts manufacturer in China. A flange nut, also known as a serrated flange nut or a spin lock nut, is a type of nut that features a wide, flat circular base or flange integrated into its design. This flange serves a specific purpose in various applications. Flange nuts are commonly used in situations where secure fastening is required, especially in applications with vibration or movement. The combination of a wide flange and serrations gives flange nuts their unique advantages in specific applications, providing a more secure and reliable fastening solution compared to standard nuts.


The specifications of flange nuts can vary based on factors such as the size, material, thread pitch, and intended application. Here are some common specifications that are often provided for flange nuts:

Product name:Flange Nuts
Size:Metric: M5-M20
Imperial: 6#-3/4“
Material:carbon steel, stainless steel (304 or 316), alloy steel, brass, and more
A2-70 A2-80 A4-70 A4-80
GradeSAE J995 GR.2/5/8
MaterialSteel/Stainless steel/Brass/Aluminum
Manufacturing Processwire drawing, cold heading/hot forging, thread rolling, heat treatment, surface treatment
Surface treatmentBlack Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating
Application IndustryConstruction/Agricultural Machinery/Industrial Structures/Equipment and Machinery/Infrastructure/Mechanical and Engineering/Automotive and Transportation

When selecting flange nuts, it’s important to consider these specifications to ensure that you choose the right nuts for your intended application. The specifications will help you match the nut’s characteristics with the requirements of your project.

Manufacturing quality control of flange nuts:

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.