
The duplex roller chain is a common type of mechanical transmission chain, which is a derivative of the roller chain.
Its design is based on the single-row roller chain with an additional row of chain links, and the transmission capacity and stability are enhanced through a structure of two parallel rows of chains. The following is a detailed introduction from aspects such as structure, characteristics, and applications.
High load-carrying capacity: Compared with single-row roller chains, the duplex structure shares the load through two rows of chains, and the transmission power can be increased by about 1.7-2 times (depending on the chain specifications), making it suitable for heavy-load scenarios.
Strong stability: The double-row symmetrical design reduces deflection and vibration during transmission, ensuring more stable operation, especially in long-distance transmission or high-speed operation.
Good durability: The load distribution is more uniform, which reduces the wear rate of individual components. When combined with lubrication, it can extend the service life.
High installation requirements: It is necessary to ensure the alignment accuracy of the two rows of chains and the sprockets; otherwise, early damage may occur due to uneven force.

Qingdao Star Machine Technology Co., Ltd. is located in the beautiful coastal city-Qingdao. We are a large enterprise group engaged in researching, production, marketing and technical services, with 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 manufacture, we have manufactured valve 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, Mid East, Eastern Asia,
Q: Can I get samples from your factory?
A: Yes, Samples can be provided.