Cold heading Service

Hex Bolts Manufacturer In China

Ningbo Teng Qi Fastener Co., Ltd specializes in the production of high strength hex bolts of different standard and specifications, covering a wide range of materials, strength grades and surface treatments. Whether carbon steel, alloy steel or stainless steel, we can provide products to meet customer needs. Moreover, our hex bolts specifications range from small to large to meet the demands of a wide range of applications.

We use advanced production technology and process, including cold heading processing, hot forging, rolling processing and so on. These processes guarantee precise dimensions, excellent surface quality and reliable performance. Our production equipment is carefully adjusted and maintained to ensure the efficient and stable production process. Equipped with professional inspection equipment, such as tensile testing machines, metallographic analyzers and projectors, and have established a strict inspection process. These measures ensure that the quality of our products is stable and reliable, so that they meet the industry standards and customer needs.

We have cooperated with many internationally renowned customers, involving construction, machinery manufacturing, automotive and other industries, accumulated rich experience and successful cases, and are committed to providing customers with high quality products and satisfactory service


The specifications of hex bolts can vary based on factors such as material, size, grade, and intended application. To provide more detailed information, it would be helpful to know the specific requirements or standards you are interested in. Here’s a general outline of what hex bolt specifications may include:

Product nameHex Bolts
Thread Diameter:Metric: M6-M100
Head TypeHex Head
Class/GradeISO 898-1 :4.8/6.8/8.8/10.9/12.9
SAE J 429:2/5/8
ASTM A307/A325/A490/A354
MaterialClass 8.8: 10B21, C45, 40CR, 35CRMO,42CRMO
Class 10.9: 40CR, 35CRMO, 42CRMO
Class 12.9: 40CR, 35CRMO, 42CRMO
A2-70/A2-80: SS304
A4-70/A4-80: SS316
Surface treatmentPlain , Black Oxidation, Zinc-plated, Hot-dip galvanized, Dacromet , Xylan
Dimension Standards Compliance:DIN933/ISO4017/DIN931/ISO4014/ASME B18.2.1/ASME B 18.2.6/EN14399
Class8.8 10.9 DIN933 Full Thread Hex Bolts Manufacturer In China

DIN933 Hex Bolt

DIN933 hex bolts are the superior products of Ningbo Teng Qi Fasteners Co., Ltd. Our factory can produce DIN933 hex bolts from M1.6-M100 by cold forging and hot forging. Our DIN933 hex bolts are renowned for durability and strength, making them ideal for heavy-duty applications across a variety of industries.

China Leading Class10.9 DIN931 Half Thread Hex Bolt Manufacturer

DIN931 Hex Bolt

Ningbo Teng Qi Fasteners is a reputable manufacturer of DIN931 hex bolts. Our factory can produce DIN931 hex bolts made of carbon steel, stainless steel and copper. We have a standing inventory of 5,000 tons from M8-M36, which can meet your various requirements for DIN931 hexagon bolts. We are famous for our quality. As a professional bolt factory in China, we provide DIN931 hex bolts with competitive prices and short delivery time.

High Strength Class8.8 Class10.9 ISO4017 Hex Bolt Manufacturer In China

ISO4017 Hex Bolt

Ningbo Teng Qi Fasteners is a factory of high quality ISO4017 hex head bolts for a wide range of industrial applications. Our ISO4017 hex head bolts are renowned for their reliability, making them a popular choice among engineers and builders. Available in a variety of sizes and finishes, we can provide the perfect solution for your specific needs. Whether you need hex head bolts for industrial or commercial use, we have the expertise and experience to meet your requirements.

High Quality Hot Dip galvanized ISO4014 Hex Bolt China Manufacturer

ISO4014 Hex Bolt

Ningbo Teng Qi Fasteners Co.,Ltd is a leading manufacturer of ISO4014 hex bolts, which can supply ISO4014 bolts of various materials, such as carbon steel, stainless steel, and alloy steel. We have been committed to providing one-stop solutions for projects in the oil and gas, water, renewable energy and infrastructure sectors. With years of unremitting efforts and innovation, our reliable, economical and environmentally friendly solutions have won wide recognition from customers.

ASME B18.2.1 Hot Dip Galvanized Grade5 Hex Bolt Manufacturer

ASME B 18.2.1 Hex Bolt

Ningbo Teng Qi Fasteners Co., Ltd is a professional asme b18.2.1 hex bolts manufacturer. Our A325 hex bolts are made of high quality medium carbon steel c45, alloy steel 40cr ,alloy steel aisi4140. They have been rigorously tested and are 100% compliant with industry standards. They are ideal for heavy-duty applications in construction, infrastructure and other fields. Whether you need a few bolts or a large number, we are committed to providing the best service and quality. Trust us for all your asme b18.2.1 hex bolt needs and experience the difference quality and reliability can make in your project.

Production process of hex bolts:

We have advanced equipment such as multi-station bolt forming machines, nut forming machines, thread rolling machines, tapping machines, large and medium-sized stamping machines, and heat treatment production lines. Relying on advanced production technology, strict testing methods and sincere service concept to serve customers.

Quality management system has passed ISO/ TS16949:2009 technical specification management system certification, ISO9001:2015 quality system certification

Production Procession of Hex Bolts
1. Material Preparation:
- Round wire steel undergoes phosphating and wire drawing to required dimension. This step ensures that the material is appropriately sized for the subsequent forming process.
2. Forming:
Size smaller M24 or 1": Cold heading -Feed the cut material into a cold heading machine, which uses punches and dies to shape the material at room temperature. The machine compresses the material, forming it into the desired hexagonal shape for the bolt head.
Size Larger than M24 or 1": Hot Forging
- This process involves heating the material to a high temperature and shaping it using dies or molds. In the context of hex bolts, hot forging imparts the desired hexagonal shape to the head of the bolt.
3. Thread rolling:
- Use a thread rolling machine for thread rolling. Product is placed between two rollers and enough pressure is applied to cause the material to thread between the rollers.
4. Heat Treatment:
- Heat treatment is applied to improve the hardness and strength of the hex bolts.
5. Surface Treatment:
- The final step involves surface treatment, enhancing corrosion resistance and providing a polished finish.

Quality control of hex bolt:

Twenty years of technical and management experience in fastener manufacturing, we introduce modern enterprise management concepts and tools, using ERP, WMS information management system and e-commerce EB, OA office automation system, to realize the scientific control of the whole process from procurement, production, warehousing, logistics, sales, finance, etc., to ensure the steady development of the enterprise. Precision instruments, professional personnel, ISO9001 quality assurance system, receiving, process, finished product inspection, is our quality assurance. Do not let bad products into the hands of customers, is our quality commitment; We believe that prompt and correct feedback provides the best service. Our bolts can provide third-party laboratory test reports such as SGS to ensure compliance with specifications.

Mechanical Property and Chemical property:

Mechanical Property of Class4.8 8.8 10.9 12.9 Metric Steel Hex Bolts

Mechanical Property of Grade2/5/8 Imperial Steel Hex Bolts

Chemical Property of Class4.8 8.8 10.9 12.9 Metric Steel Hex Bolts

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.

Application and Case Study:

Hex bolts are widely used in various applications due to their versatility and strength. Some common applications include:

Application industryFunction
ConstructionHex bolts are extensively used in the construction industry for assembling structural elements. Such as steel beams, columns, and other metal structures. They are employed in the construction of buildings, bridges, and other infrastructure projects.
MachineryHex bolts are used in the assembly and maintenance of machinery and equipment across various industries. They provide a strong and reliable fastening solution for joining components in manufacturing processes.
AutomotiveIn the automotive industry, hex bolts are used for assembling various components, including engine parts, chassis, and interior components. They are crucial for maintaining the structural integrity of vehicles.
Renewable EnergyIn the construction and maintenance of renewable energy infrastructure such as wind turbines and solar panels, hex bolts are commonly used for securing components and structural elements.
Oil and Gas Industry:The oil and gas industry uses hex bolts for assembling pipelines, drilling equipment, and various components in offshore and onshore facilities.
Electronics:Hex bolts find applications in the assembly of electronic devices and equipment. They are used in securing panels, brackets, and enclosures in electrical and electronics applications.
FurnitureHex bolts are used for assembling different parts of furniture items like tables, chairs, and cabinets
Marine and Offshoren shipbuilding and marine engineering, hex bolts are employed for assembling and securing various components on ships and offshore structures.

Our high strength iso4017/iso4014/A325 hex bolts are the designated supplier for many key projects in China, Here are some projects for reference:

  1. Sinochem Quanzhou 1 million tons/year ethylene and refining expansion project
  2. Tianjin Liquefied Natural Gas (LNG) Project Terminal and Receiving Station Engineering
  3. Shanghai Oriental Pearl Tower
  4. Zhonghua Road North Extension Project
  5. Pearl Bay Bridge Project
  6. Shanghai Nanpu Bridge

Guild To Select Correct Hex Bolt


1.How long will it take to get a reply after we send you the inquiry?

We will get back to you within 12 hours after receiving the inquiry during working days.

2.Do you accept OEM/ODM?

We specialize in the production of hexagon bolts, leveraging our extensive experience in manufacturing fasteners. Our distinctive advantage lies in offering OEM services, allowing the bolts to be branded with your company logo.

3.How do you guarantee the quality of your products?

First of all, we will have the corresponding inspection after each process, for the final product, we will be based on customer requirements and iso9001 standards for inspection; Then, we have the most advanced and complete testing equipment in the industry: 100 tons and 60 tons of tensile machines, impact testing machines, metallographic spectrometers, flaw detectors, hardness meters and torsion machines. The above equipment can fully ensure that the fasteners are provided to the customers with high requirements, and can ensure that the customer’s comprehensive testing requirements for materials are met.

4.What are your core competencies?

1. Quality Assurance with Top-Notch Equipment:
We’re all about top-notch quality, and that starts with the best machinery. Our advanced equipment ensures that every hex bolt we make meets the highest standards. From precise manufacturing to thorough quality checks, we use cutting-edge tools to guarantee our bolts are top quality.
2.Competitive Pricing Through Big-Scale Production:
We believe in making things efficiently, and that means producing on a large scale. This not only helps us cut down on making each bolt but also lets us offer you a better deal. By getting smart about how we make things and doing it on a big scale, we’re able to give you a great price without compromising on quality.

5. What are the terms of payment?

When quoting, we will confirm with you the trading method, FOB,CIF,CNF or other methods. For mass production, we generally pay 30% in advance, and then pay the balance according to the bill of lading. Most of our payment terms are T/T.

With strong production capacity, advanced manufacturing technology, strict quality control and excellent after-sales service, customers have always regarded our factory as their number one hex bolt supplier in China. Dedicated to providing customers with high-quality hex bolt products and professional pre-sales and after-sales services. You can contact us to get high-quality hex bolts and thoughtful customer service.