ISO
Chain No. |
C2 |
h3 max |
mm |
mm |
WD102 |
9.7 |
65.0 |
WD104 |
9.7 |
65.0 |
WD110 |
9.7 |
65.0 |
WD112 |
9.7 |
65.0 |
WD113 |
12.7 |
65.0 |
WD116 |
9.7 |
77.7 |
WD118 |
12.7 |
79.2 |
WD480 |
12.7 |
84.1 |
ISO
Chain No. |
C2 |
b7 max |
h2 max |
mm |
mm |
mm |
WD102 |
9.7 |
365.3 |
39.6 |
WD104 |
9.7 |
295.1 |
39.6 |
WD110 |
9.7 |
434.8 |
39.6 |
WD112 |
9.7 |
434.8 |
39.6 |
WD113 |
9.7 |
434.8 |
39.6 |
WD116 |
9.7 |
434.8 |
39.6 |
WD118 |
9.7 |
561.8 |
46.0 |
WD480 |
9.7 |
561.8 |
52.3 |
Definition and Applications
Welded-steel-type drag chains are rollerless chains designed for efficiently conveying materials such as debris and sawdust. They are also suitable for other similar material handling scenarios, and can be used in most applications requiring high-strength steel chains for conveying, driving, and lifting.
Structural Features
The structure of welded-steel-type drag chains is basically the same as that of welded structural offset link chains for engineering use. The sleeves welded to the offset link plates are non-circular shaped pipes: their outer circular surfaces engage with sprockets, while their non-circular surfaces align with the chain's running direction to push or scrape materials. Each chain link is typically composed of side plates, pins, sleeves, and other components connected by welding. Some chains may also be equipped with special attachments (e.g., C1, C3, C4, RR, and wing-shaped attachments) to meet different conveying needs.
Manufacturing Processes
- Material Selection: High-quality steels such as medium-carbon steel and low-carbon steel are usually adopted to ensure the chain has sufficient strength and toughness.
- Welding Process: Advanced and efficient dedicated welding equipment is used to ensure reliable weld quality, avoid welding defects, and guarantee the overall strength of the chain.
- Heat Treatment: Some components of the chain, such as pins, side plates, and sleeves, undergo heat treatment processes like quenching and tempering to improve their hardness, strength, and wear resistance, thereby extending the chain's service life. For example, the components of Tsubaki's WDH series welded-steel drag chains are fully quenched, providing excellent durability and toughness.
- Surface Treatment: Some chains may undergo surface treatments such as chrome plating to enhance corrosion resistance and appearance quality.
Types
Based on different performance and applications, welded-steel-type drag chains can be classified into standard type (WD), fully heat-treated type (WDH), extra-heavy type (WDH-XHD), and stainless steel type (SS), etc.
Standards
Welded-steel-type drag chains are typically manufactured in accordance with standards such as ISO 6971 and ANSI B29.18M. These standards specify in detail the chain's dimensions, shape, structure, manufacturing processes, and quality requirements.
Application Fields
They are widely used in the wood processing industry (e.g., conveying sawdust, bark, and other waste in wood mills), the paper industry (for conveying pulp and paper), the mining industry (for transporting ores and slag), as well as in grain processing, cement production, asphalt processing, and other industrial material handling systems.
COMPANY PROFILE
Qingdao Star Machine Technology Co., Ltd. is located in the beautiful coastal city of Qingdao. We are a large enterprise group engaged in researching, production, marketing, and technical services. We have three large research and production bases and one large marketing center specializing in transmission parts, bearings, chains, sprockets, tractor driving axles, and hydraulic steering units. Covering an area of 80,000 square meters, we now have 816 employees, including 167 senior professional technicians, and a global network of sales and service systems. Maintaining good partnerships with Liaocheng University, Qingdao University, Shandong Agricultural University, Shandong University, and the Chinese Academy of Agricultural Sciences, we receive strong technical support from industry experts.
"You provide a request, we'll give you a perfect product".
We uphold the business philosophy "integrity, efficiency, cooperation, innovation", quality first, advanced technology, precision production, integrity management, efficient service, to support our customers with the top quality products and super sophisticated technology.

1. Reliable Quality Assurance System
2. Cutting-Edge Computer-Controlled CNC Machines
3. Bespoke Solutions from Highly Experienced Specialists
4. Customization and OEM Available for Specific Application
5. Extensive Inventory of Spare Parts and Accessories
6. Well-Developed Worldwide Marketing Network
7. Efficient After-Sale Service System
The 219 sets of advanced automatic production equipment provide guarantees for high product quality. The 167 engineers and technicians with senior professional titles can design and develop products to meet the exact demands of customers, and OEM customizations are also available with us. Our sound global service network can provide customers with timely after-sales technical services.
We are not just a manufacturer and supplier, but also an industry consultant. We work pro-actively with you to offer expert advice and product recommendations in order to end up with a most cost effective product available for your specific application. The clients we serve worldwide range from end users to distributors and OEMs. Our OEM replacements can be substituted wherever necessary and suitable for both repair and new assemblies.
Q: Why choose us?
A. We are a manufacturer; we have manufactured valves for over 20 years.
B. Reliable Quality Assurance System.
C. Cutting-Edge Computer-Controlled CNC Machines;
D. Bespoke Solutions from Highly Experienced Specialists.
E. Customization and OEM Available for Specific Application.
F. Extensive Inventory of Spare Parts and Accessories;
G. Well-Developed Worldwide Marketing Network;
H. Efficient After-Sale Service System
Q. What is your payment term?
A: 30% TT deposit, 70% balance T/T before shipping.
Q: Can we print our logo on your products?
A: yes, we offer OEM/ODM service, we support the customized logo, size, package,etc.
Q: What is your main market?
A: North America, South America, Eastern Europe, Western Europe, Southeast Asia, Africa, Oceania, Middle East, Eastern Asia.
Q: Can I get samples from your factory?
A: Yes, Samples can be provided.