China Bolt Manufacturer | OEM/ODM Bolt Supplier
Our bolts are manufactured using high-quality alloy steel and high-precision machining processes, providing reliable strength, durability, and accuracy in a variety of industrial, mechanical, and construction applications. Suitable for diverse environments, our bolts help improve connection stability, prevent loosening, resist corrosion, and meet high load and long-term service requirements.
As a professional OEM/ODM bolt manufacturer located in Guangdong Province, China, we offer customized products primarily made of carbon steel, alloy steel, and stainless steel, supporting flexible customization of thread type, head type, coating, anti-loosening structure, and packaging options.
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![Heavy Hex Bolts]()
Heavy Hex BoltsMaterial: Carbon steelview more
Strength grade: 4.8 / 6.8 / 8.8
Customization: OEM/ODM
Manufacturer: zeyao
Packaging: Bulk/Bagged/Boxed
Certifications: ISO 9001/SGS/TUV -
![Square-Neck Carriage Bolts]()
Square-Neck Carriage Bolts-Material：Steel 1018, steel 10B21, stainless steel, aluminum.view more
-Surface finish: Zinc plated, Zinc nickel plated, black oxide, Decromet
-Thread metric:M2,M3,M4,M5,M6,M8,M12
-Thread... -
![Black Square Head Bolt]()
Black Square Head Bolt-Material：Steel 1018, steel 10B21, SCM435 steelview more
-Surface finish: Zinc plated, Zinc nickel plated, black oxide, Decromet
-Thread metric:M2,M3,M4,M5,M6,M8,M12
-Thread... -
![Hex Flanged Head Long Bolt]()
Hex Flanged Head Long BoltMaterial: 1035 steel, SCM435 steel, 45k steel, zinc nickel platingview more
Surface finish: Decomate coating, zinc flake coating
Salt spray time: Over 1000 hours of medium salt spray testing,... -
![DIN603 Carriage Bolt]()
DIN603 Carriage BoltCarriage Bolt, Square Neck Boltview more
Thread Size: Metric & Inch
Material: Carbon Steel & Stainless Steel
Finish: Black, Nickel, Zinc, etc.
Head Type: Round Head -
![IFI-115 12-Point Screw Bolt]()
IFI-115 12-Point Screw BoltHead type: 12-point flanged headview more
Drive Style: External 12 point
System of Measurement: Metric or inch
Threading: fully or partially threaded
Fastener strength:... -
![Zinc Steel Eye Bolt]()
Zinc Steel Eye BoltEye Bolt, Sheep Eey Screwview more
Thread Size: Metric & Inch
Material: Carbon Steel
Finish: Black, Nickel, Zinc, etc.
Head Type: Sheep Eye Head -
![Wing Bolt Butterfly Screw]()
Wing Bolt Butterfly ScrewWing Bolt Butterfly screw is also called butterfly ingot screw, horn bolt or butterfly hand screw. The main body is made of 304 stainless steel. It is a fastener that can be manually operated...view more -
![Stainless Steel Step Bolts]()
Stainless Steel Step BoltsMaterial: High-quality stainless steelview more
Screw Diameter: Common sizes M6, M8, M10, M12, M16 (customizable)
Surface Treatment: Galvanized, passivated, black oxide, spray-coated, etc.... -
![Aluminum Hex Head Bolt]()
Aluminum Hex Head BoltThe aluminum hex head bolt is a lightweight, strong, and corrosion-resistant fastening. It's suitable for a variety of demanding industries, including automotive, machinery, aerospace, and...view more -
![Square Head Bolt]()
Square Head BoltThe square head bolt is a high-performance fastening known for its superior corrosion resistance and strength. It can endure harsh environments and is ideal for use in demanding applications.view more -
![Button Head Flanged Head Bolt]()
Button Head Flanged Head BoltThe button head flanged bolt is designed with a button head, a flange, and a threaded shaft. The button head makes the installation and removal easier. The flange increases the surface area of...view more
About Zeyao
Zeyao is a professional Chinese bolt manufacturer, specializing in the R&D and production of bolts and non-standard fasteners for 19 years. We provide high-quality, reliable, and durable custom bolts and standard bolts to global buyers, brand customers, and industrial partners.
Our factory boasts over 160 advanced pieces of equipment, including precision threading machines, CNC machining centers, automated assembly lines, and surface treatment equipment, with a monthly output exceeding ten million pieces, ensuring stable delivery of large-volume orders.
Core Advantages
R&D & Quality Management: Mature R&D team + rigorous quality system, ISO9001, BSCI, CE, RoHS, FDA and other international certifications.
Products & Applications: Bolts, screws, nuts, washers, pins, rivets and CNC machined parts; widely used in automotive, electronics, construction, aerospace, industrial machinery, medical, furniture, railway and other industries.
OEM/ODM Customization: Supports full customization of appearance, thread structure, materials, functions, anti-loosening design, surface treatment, logo engraving/labeling and packaging.
Full Customization Guidance: From requirements communication → design confirmation → sample testing → mass production, ensuring efficient and reliable delivery throughout the entire process.
Global Supply & Certification: Products are exported to Europe, America, Southeast Asia, and the Middle East, with a long-term stable supply guarantee.
Our Certificate
Types of Bolt
The bolts produced by our company mainly include the following types:
Hex Bolt
A hex bolt is a type of threaded fastener that features a hexagonal head designed for easy wrenching or socket tightening. The head has six flat sides, unlike screws with recessed heads. Hex bolts are commonly used in applications where strong, reliable fastening is needed, such as in construction, machinery, and automotive industries.
Cap Head Bolt
A cap head bolt, also known as a socket head cap screw or hex socket screw, is a type of fastener that has a cylindrical head with a hexagonal recess. This recess allows the bolt to be tightened and loosened using an Allen wrench or hex key.
Wing Head Thumb Bolt
The wing head thumb bolt is designed for ease of use and quick, tool-free installation and removal. Its wing-shaped head offers a more comfortable and secure grip, which makes it particularly useful in tight or hard-to-reach spaces.
Specification
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D |
P |
K |
S |
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Max |
Min |
Max |
Min |
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M3 |
0.5 |
2.2 |
1.9 |
5.5 |
5.25 |
|
M4 |
0.7 |
3 |
2.8 |
7 |
6.65 |
|
M5 |
0.8 |
3.74 |
3.26 |
8 |
7.65 |
|
M6 |
1 |
4.24 |
3.76 |
10 |
9.65 |
|
M7 |
1 |
5.04 |
4.56 |
11 |
10.57 |
|
M8 |
1.25 |
5.54 |
5.06 |
13 |
12.57 |
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M10 |
1.5 |
6.69 |
6.11 |
17 |
16.57 |
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M12 |
1.75 |
7.79 |
7.21 |
19 |
18.48 |
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M14 |
2 |
9.09 |
8.51 |
22 |
21.16 |
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M16 |
2 |
10.29 |
9.71 |
24 |
23.16 |
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M18 |
2.5 |
11.85 |
11.15 |
27 |
26.15 |
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M20 |
2.5 |
12.85 |
12.15 |
30 |
29.16 |
Advantages of Bolt
Bolted Joints Are Easy to Use
The bolted connection is an appealing method due to its ease of use. It combines a screw/stud with a threaded counterpart such as a nut or tapped hole and only requires a simple torque wrench to operate.
Bolted Joints Are Flexible
A bolted joint is not a permanent assembly, it can be easily removed and reused using the same tools with which it was assembled. This is very helpful for maintenance, simple checks or replacement of parts. It is also useful when the product is at the end of its life cycle as parts made of different materials can be separated, sorted and recycled effectively.
Bolts Come in Many Sizes and Materials
Bolts are available in a range of sizes and materials depending on the demand of the application. They are commonly made of steel, which provides strong mechanical characteristics that are usually greater than the capacities of the assembled parts.
Bolts Can Clamp Different Materials Together
Bolts can be used to join parts made of materials that are different than the bolt itself, such as plastics and composites. No special arrangement or design is required to make this assembly compatible.
Bolts Can Secure Thick Parts
The thickness of the assembled parts can be as large as they need to be to fit the manufacturer’s needs. The thickness and the hole size can be produced with large tolerances. This usually implies economical and regular well-known machining processes.
Bolts Can Operate at a Wide Temperature Range
Normalized steel bolts can sustain temperatures between -50°C and 200°C and for wider demands, stainless steel bolts can function between the ranges of -160°C and 500°C. Special designs using materials able to sustain high temperatures and alloys capable of functioning in an acidic environment can bring the connection to the right level of performance.
Applications of Bolt
Construction and Building
Bolts are used to secure structural components like steel beams, columns, and concrete foundations, providing the necessary stability and strength for buildings and infrastructure.
Automotive and Aerospace
In these industries, bolts are used for assembling vehicle parts, securing engine components, and attaching various elements of the chassis and body. Their high load-bearing capacity and reliability are crucial for safety and performance.
Heavy Machinery
Bolts are essential for assembling and maintaining heavy machinery, ensuring that components are securely fastened and can withstand operational stresses.
Mining and Tunneling
Rock bolts are used to stabilize rock formations, preventing collapses and ensuring the safety of underground operations.
Materials of Bolt
Carbon Steel
Because of their low cost and general-purpose strength, carbon steel bolts are one of the most commonly utilized types of bolts. Grades such as Grade 2, Grade 5, and Grade 8 are available, each offering different levels of strength and durability.
Alloy Steel
Alloy steel bolts are created by combining particular alloying components with carbon steel to improve mechanical qualities. Chromium, molybdenum, nickel, and vanadium are common alloying elements used to improve strength, hardness, and corrosion resistance.
Stainless Steel
Chromium is present in stainless steel bolts, which produces a protective oxide coating on the surface, offering good corrosion resistance. Stainless steel grades (e.g., 304, 316) have varied levels of corrosion resistance and strength.
Titanium
Titanium bolts are well-known for their high strength-to-weight ratio, resistance to corrosion, and biocompatibility. They are widely employed in aeronautical, medical, and marine applications where weight savings and resilience to severe environments are critical.
Brass
Brass bolts are formed of a copper-zinc alloy. They have good corrosion resistance, electrical conductivity, and an attractive look.
Aluminum
Aluminum alloy bolts are lightweight and resistant to corrosion. They are employed in applications that require weight reduction, such as the automobile and aerospace sectors.
Bolt Installation Notes
Use the Right Tools: Always use the right tools when installing custom bolts. This ensures that it is itself snug-fitting on the bolt and causes no damage to the bolt as well as the material.
Follow Manufacturers Instructions: Installation recommendations provided shall be taken and followed manufacturer recommendations including torque and pre-treatment specifications.
Parts Alignment: All parts shall be aligned. When the bolts are tightened, misalignment causes excessive stress on the components, leading to damage.
Clean the Threads: Ensure that the threads on the bolt and inside the receiving hole are clean and clear of any debris when installing the same. This is for correct fit-up and safe hold.
Apply Lubrication: Apply the recommended type of lubrication on the threads. It reduces friction, avoids galling, and gives the bolt proper torque.
Check Bolts Periodically: Bolts after installation, bolt should be checked periodically to whether they are experiencing wear corrosion, or loosening and the integrity of the assembly was maintained.
Do Not Over-Tighten: There is no need to over-tighten the bolts because they tend to damage the threads or break the bolt and thus compromise the connection.
Use Locking Mechanisms: Wherever vibration or movement is associated with an application, one must ensure a locking mechanism is integrated, using lock washers or material made from thread-locking compounds, which will prevent the bolts from becoming loose.
Torque in a Sequence: In situations where more than one bolt is engaging in a single assembly, the action should take place in a pre-determined torque sequence or 'pattern' so that the pressure being applied is uniform without causing warping.
Store Properly: Store bolts in a clean, dry place to prevent corrosion and damage prior to their use.
Order Process
Packaging and Shipping
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Packaging |
Plastic bag + outer carton + pallets |
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Shipping |
We will help you to choose the best shipping way according to your detail requirements. By sea, by air, or by express, etc. |
FAQ
We're professional bolt manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to wholesale customized bolt made in China here from our factory.
