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Carriage Bolts Manufacturers, Suppliers and Factory In China

Ningbo Teng Qi Fasteners Co., Ltd is a leading carriage bolts manufacturer in China. A carriage bolt, also known as a coach bolt, is a type of threaded fastener designed for use with wood. It has a distinctive appearance that sets it apart from other bolts. Carriage bolt consist of a smooth, dome-shaped head and a square or ribbed neck section immediately beneath the head. The square neck prevents the bolt from turning when it is being tightened or loosened.

Carriage bolts are commonly used in woodworking and construction projects where a strong and secure connection is needed. They are often used to attach wooden components together, such as fastening beams, brackets, or hardware to wooden structures. The square neck of the carriage bolt fits into a pre-drilled square hole in the wood, preventing the bolt from rotating while the nut is being tightened on the other side.

Due to their unique design, carriage bolt are especially useful in applications where you want to secure materials without having access to both sides of the connection, as the square neck prevents the bolt from turning when you tighten the nut.

Specification of carriage bolts:

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

Product nameCarrige Bolts
Size and Length:Metric: M5-M20
Imperial:#10" to 1"
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:Round Head Square Neck Bolts
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

These specifications help you choose the right carriage bolt for your project, ensuring a secure and reliable connection. It’s important to select carriage bolt that match the requirements of your application to achieve the desired results.

FAQ about Carriage Bolts Manufacturer:

1.What’s the price of class 8.8 carriage bolts?

In general, our class 8.8 carriage bolts are made of c45 steel. The price is made up of materials, processing, packaging and labor costs. We are focused on the production of carriage bolts factory. Committed to making our customers profitable. The wholesale price of 8.8 class bolts is 1500-2000usd/ton. The material price of steel will fluctuate frequently, and the price is different for different surface treatment/quantity, so please send the inquiry to our email for the specific price. Emai:

2.Can you guarantee the quality of the bolts?

Yes. From raw materials to final packaging, we strictly control quality, we can ensure that the fasteners manufactured by us meet the performance requirements and the materials are traceable.

3.Can you supply stainless steel carriage bolt?

Yes, we are leading fasteners supplier in China. Stainless steel, carbon steel hex bolts can be produced, and there is a large stock.

5. Do you have a minimum order quantity requirement?

Yes, the MOQ we usually produce is about 500kg. But we have most sizes in stock, so for inventory items, even 10 units we can supply.

6.What countries do you export your bolts to?

We have stable customers in the United States, Germany, Russia, Poland, Spain, Brazil, Argentina, Vietnam, Canada, Australia, UAE, Saudi Arabia and other countries for more than 10 years.

Manufacturing Quality Control:

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.