Sanwei:Your Professional Fastening Bolts Manufacturer!
Hebei Sanwei Fasteners Co., Ltd. is a high-tech enterprise specializing in the research, development, production, and sale of fasteners, located in Hebei Province, China. Since its establishment,wei has been committed to providing customers with high-quality, high-performance fastener solutions, which are widely used in various fields such as construction, machinery manufacturing, automobile, and power communication.
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German Standard DIN931 BoltsStandard: DIN931. Name: German standard DIN931 bolts. Material: carbon steel and alloy steel, etc.. Grade: Grade 4.8, Grade 5.8, Grade 8.8
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National Standard Expansion BoltsStandard: GB22795. Name: National standard expansion bolts. Material: carbon steel. Grade: 4.8 grade, 5.8 grade, 8.8 grade
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Eyelet BoltsStandard: DIN444. Name: Slip joint bolts. Material: carbon steel and alloy steel, etc.. Grade: Grade 4.8, 5.8, 8.8
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Wing BoltsStandard: DIN316. Name: Wing Bolt. Material: Carbon steel and alloy steel, etc.. Grade: Grade 4.8, 5.8, 8.8
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Combination BoltsStandard: DIN6900. Name: Combination bolts. Material: carbon steel and alloy steel, etc.. Grade: Grade 4.8, 5.8, 8.8
Why Choose Us
OEM/ODM Service
Our customised fasteners are made to your special requirements. It can be fully threaded or partially threaded, and the thread, driving method, material, length, head shape, plating and all these can be specially designed according to your needs.
Good CNC machining technology
From material selection to finished products, Handan Sanwei provides you with comprehensive solutions when it comes to customised fasteners. The fasteners we make are high precision and strong. No matter what kind of precision you need, we can meet it and guarantee your satisfaction.
Strong engineering design team
Our company has an excellent and professional engineering team, and a number of technicians are elites in the industry. The staff always strives to explore new methods and technologies. From the selection of metals and special alloy materials to the finished fasteners, we can solve all aspects of the whole project engineering.
Professional Testing Laboratory
Quality assurance and testing is an important part of producing fasteners. Handan Sanwei has a specialised quality testing laboratory with spectrometers, hardness testers, tensile testers, salt spray test chambers and other equipment, where raw materials and final products are strictly tested. In addition, the company also has experienced testing experts who use professional methods to comprehensively test the fasteners and finally give you a detailed test report.
Digital Quality Control System
We rely on our self-developed full-process digital quality inspection system to strictly control every step from raw materials entering the factory to finished products being shipped. This system will always monitor the quality of the products to ensure that each batch of products meets the industry standards and complies with customer requirements. In addition, it collects and feeds back data in real time, giving you a clear understanding of product quality.
Types of Fastening Bolts
The fastening bolts produced by our company mainly include the following types:
Wing Bolts
Visually, the head of the wing bolt is winged, a unique shape that resembles two small wings. The wings are designed to facilitate manual tightening and loosening without the need for additional tools. Users can apply torque by squeezing the wings with their fingers, which makes the operation process extremely convenient, especially for occasions that require frequent disassembly and installation. In addition, the size and shape of the wings are usually designed to ensure a good hand grip according to the specific needs of the application.
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Standard |
DIN316 |
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Name |
Wing Bolt |
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Material |
Carbon steel and alloy steel, etc. |
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Grade |
Grade 4.8, 5.8, 8.8 |
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Nominal Diameter |
M2-M48 |
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Pitch |
0.4-5 |
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Surface treatment |
ZP,YZ,BLACK |
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Alias |
Butterfly bolt, hand screw bolt |
Eyelet Bolts
A eyelet bolt is a special fastener characterized by a circular ring at one end of the bolt. This ring can be used as an attachment point for tethering materials such as rope, chain, or cable, or for suspending objects. This design makes the knuckle bolt useful in applications that require both fastening and suspension functions.
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Standard |
DIN444 |
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Name |
Slip joint bolts |
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Material |
Carbon steel and alloy steel, etc. |
|
Grade |
Grade 4.8, 5.8, 8.8 |
|
Nominal Diameter |
M2-M48 |
|
Pitch |
0.4-5 |
|
Surface treatment |
ZP,YZ,BLACK |
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Alias |
Pivot Screws, Swivel Bolts |

Tool-Free Operation:
The most significant advantage is the ability to tighten and loosen wing bolts without any tools. This makes them convenient and quick to use, especially in situations where access is limited or tools are not readily available.
Adjustability:
Wing bolts are easy to adjust, allowing for quick and precise repositioning or removal of components. This is particularly useful in applications where frequent adjustments are needed, such as in furniture, car batteries, or drum kits.
Ease of Installation and Removal:
The wings provide a larger surface area for gripping, making it easier to install and remove wing bolts compared to traditional nuts.
Accessibility in Tight Spaces:
The lack of tools required for operation means wing bolts can be used in tight spaces where other fasteners might be difficult to access.
Versatility:
Wing bolts can be used in a wide range of applications, from simple home projects to industrial machinery.
Versatility: Eyelet bolts are versatile and can be used in construction, marine, aerospace, and industrial applications for lifting and securing heavy objects.
Safety: Eyelet bolts are crucial in rigging applications where safety is paramount. Their design ensures a secure hold, minimizing the risk of accidents.
Durability: Made from high-strength materials, eyelet bolts provide long-lasting performance even in extreme conditions such as high humidity, saltwater exposure, or heavy-duty industrial use.
Customization: Available in a wide range of materials, sizes, and grades, they can be tailored to meet specific project requirements.
Ease of Use: Eyelet bolts are easy to install and remove, making them user-friendly for both professionals and DIY enthusiasts.

Application of Wing Bolts
Equipment Panels
Wing bolts are commonly used to secure panels in electronic devices like computer cases, instrument panels, and control boxes. Their design allows for easy access, enabling quick removal or adjustment of panels without the need for tools. This is particularly useful in environments where equipment requires frequent servicing or upgrades.
Furniture
In the furniture industry, wing bolts are often included in assembly kits for adjustable pieces like desks, chairs, and beds. Their tool-free design allows users to easily modify configurations or preferences without the need for additional tools, making it simple to adapt furniture to different needs or spaces.
DIY Projects
For DIY enthusiasts, wing bolts are perfect for projects that require frequent adjustments, such as model building, robotics, or crafts. Their tool-free design makes assembly and disassembly quick and easy, allowing hobbyists to make modifications or corrections without the hassle of specialized tools.
Automotive
In automotive applications, wing bolts are used to secure interior trim pieces and accessories that need periodic adjustments or removal for maintenance or upgrades. This tool-free fastening system streamlines repairs and modifications, providing both convenience and flexibility.
Medical Devices
Wing bolts are essential in medical equipment, especially for devices like hospital beds and examination tables that require frequent adjustments. Their tool-free design allows healthcare professionals to quickly make changes, ensuring patient comfort and accessibility without wasting time.
Laboratory Equipment
In laboratories, wing bolts secure and adjust equipment with ease. Their simplicity and quick adjustment capabilities help researchers maintain precise setups while saving time and enhancing productivity.
General Fastening
Wing bolts are also widely used in general fastening applications, including plumbing, marine equipment, and machinery, where their tool-free design increases efficiency and convenience. Their versatility makes them an invaluable tool in a wide range of industries.
Lifting and Rigging: Eyelet bolts are often used for lifting and rigging applications. They provide a secure attachment point for hooks, cables, or other lifting equipment. When properly installed and rated, they can be used to lift heavy loads.
Securing Loads: Eyelet bolts are used to secure loads during transportation. They provide anchor points for straps, chains, or other securing devices, helping to prevent movement or shifting of the load.
Construction and Building: In construction, eyelet bolts are utilized for various purposes, such as anchoring scaffolding, securing safety nets, or providing attachment points for hoists and pulleys.
Marine Applications: Eyelet bolts made from corrosion-resistant materials like stainless steel are commonly used in marine environments. They can be employed for securing equipment, attaching lines, or as anchor points on boats and ships.
Agricultural Use: Eyelet bolts are used in agriculture for tasks like securing equipment, creating anchor points for ropes or cables, and providing attachment points for lifting and moving heavy objects.
Stage Rigging and Entertainment: Eyelet bolts are often used in the entertainment industry for stage rigging. They provide anchor points for lights, curtains, speakers, and other equipment used in concerts, theaters, and events.


Overhead Hanging: Eyelet bolts are used for overhead hanging applications, such as hanging signs, decorations, or lighting fixtures. They provide a secure point for suspension.
Material Handling: In warehouses and manufacturing facilities, eyelet bolts can be used for material handling. They serve as anchor points for hoists, cranes, and other lifting equipment.
Outdoor and Recreational Equipment: Eyelet bolts are used in outdoor and recreational settings for activities like rock climbing, zip-lining, and tree climbing. They provide anchor points for safety harnesses and other equipment.
DIY and Home Improvement: Eyelet bolts can be used in various DIY projects and home improvement tasks.
Common uses include creating hanging points for planters, hammocks, or outdoor decorations.
Tie-Down Points for Vehicles: Eyelet bolts can be installed in vehicles or trailers to serve as tie-down points for securing cargo during transportation.
Hoisting and Pulling: Eyelet bolts can be used for hoisting and pulling applications, providing a stable attachment point for ropes or cables used in manual or mechanical pulling tasks.
Packaging and Shipping

FAQ
We're professional fastening bolts manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to wholesale customized fastening bolts made in China here from our factory. Contact us for quotation.
German Standard DIN931 Bolts, Combination Bolts, Wing Bolts

