Cold heading Service


Ningbo Teng Qi Fasteners Co., Ltd is a leading flange bolts manufacturer in China. Flange bolts are a type of fastener designed for specific applications where load distribution and resistance to rotation are important. They have a built-in flange (a flat, wide disc-like extension) under the head that serves as a washer, providing a larger bearing surface and distributing the load over a wider area. This design helps prevent the bolt from sinking into the material and helps minimize damage to the material’s surface.

These bolts are commonly used in situations where a secure and stable connection is required, such as attaching parts to soft materials or preventing damage to surfaces. Flange bolts are often used in automotive, construction, and machinery applications, as well as in situations where vibration resistance is crucial.

The use of flange bolts can simplify assembly by eliminating the need for separate washers and providing a more secure connection in a single component.

Specification of Flange Bolts:

Flange bolts have specific specifications that describe their size, dimensions, and features. Here are some common specifications used to describe flange bolts:

Product nameFlange Bolts
Size and Length:Metric: M5-M36
Imperial:#10" to 1-1/2"
Thread Type and Pitch:Metric: Up to 800mm
Imperial: Up to 30"
Material:carbon steel, stainless steel (304 or 316), alloy steel, brass, and more
Head Type:Flange Head
Finish and Coating:Black Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating
Industry Standards:ISO/ASTM/ASME/DIN/UNI/JIS
Packaging:Boxes/cartons into wooden pallets
Application:Construction/Agricultural Machinery/Industrial Structures/Equipment and Machinery/Infrastructure

Quality control of flange bolts:

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.