Reliable Steel Bolts Supplier Exporter In China

Ningbo Teng Qi Fasteners Co., Ltd. is a professional bolt supplier and exporter with years of experience in the fastener industry.
We work closely with selected high-quality manufacturers in China, focusing on providing stable, reliable products to customers who care about quality, consistency, and long-term performance.

Our goal is simple: to help customers get bolts that meet real requirements — from material and size to strength and surface finish. We understand that not every factory in China can meet those standards, so we take the time to evaluate and integrate the right suppliers into our system.

Deep Knowledge of Bolt Manufacturing – From Start to Finish

We know how bolts are made, and we take every step seriously. Quality doesn’t come from just the final product — it comes from controlling each part of the process:

•Wire Drawing – Choosing and handling stable raw materials

•Cold Forging – Making sure the shape and structure are solid

•Thread Rolling – Getting smooth and precise threads

•Heat Treatment – Making the bolts strong, with the right hardness

•Surface Treatment – Making sure coating and rust protection are done properly

Before working with any supplier, we take time to check their production process, testing equipment, material control, and attitude toward quality. We don’t just buy products — we build a long-term supply chain that works.

AS1252 high strength hex bolts manufacturer

Type of Bolts:

Hex Bolts: also known as hexagon head bolts or cap screws, have a hexagonal head that can be easily tightened or loosened with a wrench or socket. They are used in a wide range of applications and are available in various lengths and materials.

Carriage Bolts: Have a rounded, dome-shaped head and a square neck under the head. They are designed to prevent rotation when tightening and are often used in wood-to-metal connections.

Anchor Bolts: Embedded in concrete or masonry and are used to secure structural elements like columns, beams, and machinery to the foundation.

Stud Bolts: Have threads on both ends and are often used in conjunction with two nuts to secure flanges in piping systems.

Flange Bolts: A flanged head that provides a wider load-bearing surface. They are often used in applications requiring a large bearing area.

These are just a few examples of the many types of bolts available. Each type of bolt is designed to serve specific purposes and offer unique features suited to different applications and industries. The choice of bolt type depends on factors such as load requirements, material compatibility, and the specific characteristics of the joint being fastened.

Specification:

Product Name	Bolt
Diameter:	Metric: M6-M100 Imperial:1/4" to 4"
Length	Metric: Up to 800mm Imperial: Up to 30"
Material:	carbon steel, stainless steel (304 or 316), alloy steel, brass, and more
Strength Grade:	Metric: 800MPA/1000MPA/1200MPA Imperial: 125ksi/175ksi
Head Type:	Hex head/flange head/square head/heavy hex head/round 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

Regular Material of Bolts:

Steel Bolt Stainless Steel Bolts Brass Bolt Aluminum Bolt

Regular Dimension of Bolts:

M6 Bolt M8 Bolt M10 Bolt M12 Bolt M16 Bolt M20 Bolt M24 Bolt M30 Bolt M36 Bolt M42 Bolt M48 Bolt M56 Bolt M64 Bolt M72 Bolt M80 Bolt

FAQ about bolts:

1.How are bolts with specialized heads, such as carriage bolts, manufactured?

We choose the right production process according to different head shape/diameter/length/tolerance requirements. Diameter size is less than M24, length is less than 200mm, we will choose multi-station cold heading machine produce. Diameter size larger than M24, length larger than 200mm, we will choose hot forging.

2.Can you produce custom bolts to meet specific requirements?

Yes, we can customize bolts with specific dimensions, materials, coatings, or features to meet unique customer needs.

3.How to ensure traceability and quality assurance in bolt manufacturing?

We implement traceability systems, such as lot numbering, and maintain detailed records to ensure product quality and traceability.

4.Can you produce high-strength bolts for applications that require exceptional load-bearing capacity?

Yes, we can produce high-strength bolts with specific materials and heat treatments to meet the demands of heavy-duty applications like construction and aerospace.

5. What are the key steps in the quality assurance process for bolts during manufacturing?

Quality assurance involves inspections at various stages, including material testing, forging, threading, heat treatment, and surface finish checks.

6.What surface treatment bolts can you provide?

Regular surface treatment: Black/Plain Bolt Hot-Dip-Galvanized Bolt Galvanized/Zinc Plated Bolt

Manufacturer quality control in production process bolts:

In a world where connections matter, Ningbo Teng Qi Fasteners is more than just a bolts manufacturer and supplier. 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 hex bolts 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 Method	Detail
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.