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.

 

 
  • German Standard DIN931 Bolts
    Standard: DIN931. Name: German standard DIN931 bolts. Material: carbon steel and alloy steel, etc.. Grade: Grade 4.8, Grade 5.8, Grade 8.8
  • National Standard Expansion Bolts
    Standard: GB22795. Name: National standard expansion bolts. Material: carbon steel. Grade: 4.8 grade, 5.8 grade, 8.8 grade
  • Eyelet Bolts
    Standard: DIN444. Name: Slip joint bolts. Material: carbon steel and alloy steel, etc.. Grade: Grade 4.8, 5.8, 8.8
  • Wing Bolts
    Standard: DIN316. Name: Wing Bolt. Material: Carbon steel and alloy steel, etc.. Grade: Grade 4.8, 5.8, 8.8
  • Combination Bolts
    Standard: 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.

 

Standard

DIN316

Name

Wing Bolt

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

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.

 

Standard

DIN444

Name

Slip joint bolts

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

Alias

Pivot Screws, Swivel Bolts

 

Wing Bolts

 

Advantages of Wing 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.

 

 

Advantages of Eyelet Bolts

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.

Eyelet Bolts

 

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.

 

Application of Eyelet Bolts
 

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.

2

 

3

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

 

 

p20250414113337f1678.png (745×365)

 

 

FAQ

 

 

Q: I need a customized fastener, but it's not on your website. What do I do?

A: Please send us your request with detailed drawings or photos, then we will make the quotation for you accordingly.

Q: In general, how long can delivery be made after receiving an order?

A: Regular orders can be completed and shipped within 15-20 working days after receiving the deposit and confirming product details.

Q: During the product usage process, if we encounter technical problems, can you provide technical support?

A: Sure. We have a professional technical team that can provide you with technical consultation and guidance through methods such as telephone, email, or video conference.

Q: What is the packaging method of the product?

A: 50KG bag and pallet.

Q: What is your minimum order quantity?

A: Our minimum order quantity (MOQ) varies depending on the bolt type. For standard hex bolts, the MOQ is typically 1,000 pieces per size. This helps us streamline production and cover associated costs. For specialty bolts like custom - designed anchor bolts, the MOQ is around 5,000 pieces due to the complexity of manufacturing. However, we're flexible. If you're ordering a diverse range of bolts, we can negotiate a lower MOQ for each item. For new customers looking to build a long - term relationship, we'll consider reducing the MOQ on a case - by - case basis. For common aluminum bolts, we may set the MOQ as low as 800 pieces to accommodate smaller - scale projects.

Q: How do wing bolts differ from wing nuts?

A: Wing bolts and wing nuts differ primarily in their thread type and function. Wing bolts feature a male thread and are designed to act as a fastener that can be tightened or loosened by hand, making them suitable for applications requiring a screw-like function. In contrast, wing nuts have a female thread and are used to secure a bolt or stud. While both allow for tool-free operation and have similar ergonomic designs, wing bolts are commonly found in adjustable mechanisms, whereas wing nuts are often used to fasten components like bicycle wheels or clamps.

Q: What materials are wing bolts made from?

A: Wing bolts are made from various materials to suit different needs. Common materials include stainless steel, which offers high corrosion resistance; carbon steel, often zinc-plated for added durability; alloy steel, which balances strength and corrosion resistance; brass, valued for its aesthetic and rust-resistant qualities; and lighter options like nylon, titanium, and aluminum for specific requirements such as reduced weight or non-conductivity.

Q: Can wing bolts be used outdoors?

A: Yes, wing bolts can be used outdoors, but their suitability depends on the material used. Stainless steel wing bolts are the best choice for harsh environments due to their excellent corrosion resistance. Galvanized wing bolts offer good protection against moisture but may not withstand highly corrosive conditions. Zinc plated wing bolts provide basic corrosion resistance but are less suitable for outdoor use, particularly in humid environments. Therefore, for outdoor applications, it is essential to select the appropriate material to ensure durability and performance.

Q: When using an eyelet bolt?

A: When using an eyelet bolt for lifting, ensure the load is applied in line with the eye's axis (not at an angle) and that the eyelet bolt is properly installed and not overloaded. It's also crucial to inspect the eyebolt for damage before each use and to use the correct type of eyebolt (shouldered or machinery) for angled lifts.

Q: What angle is not recommended for eyelet bolts?

A: Eyelet bolts are generally not recommended for lifts at angles greater than 45 degrees. While some shoulder eyelet bolts can handle angular loads up to 45 degrees, plain eye bolts should not be used for angular applications. Using eyelet bolts at angles greater than 45 degrees can significantly reduce their load-bearing capacity and potentially lead to failure.

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
Send Inquiry