BS30-C212A（3.0X Speed）
BS30-C212A Double Plus Chain
| Model | unit | C2060T/BS25-C208A | |
| Pitch-（P) | P | mm | 38.1 |
| Roller size | d1 max | mm | 18 |
| d8 max | mm | 38.0 | |
| b1 max | mm | 9.57 | |
| b8 max | mm | 20.0 | |
| Pin size | d2 max | mm | 5.94 |
| L max | mm | 58.10 | |
| Lc max | mm | 62.7 | |
| Chain plate size | H max | mm | 15.0 |
| T max | mm | 3.2 | |
| t max | mm | 4.0 |
Product Overview – What is a Double Plus Chain?
A Double Plus Chain, also known as a double-speed chain or differential speed chain, is a conveyor chain designed to achieve higher conveying efficiency with minimal chain speed. By combining large and small rollers, the chain enables tooling plates to move 2x, 2.5x, or even 3x faster than the chain itself.
The model introduced here is a 3× speed Double Plus Chain, engineered for fast, smooth, and reliable conveying.
Double Plus Chains are widely used in automotive assembly lines, motorcycle factories, electronics production, and household appliance conveyors, offering quiet operation, low wear, and long service life.
Main Features
High-Speed Conveyance (Up to 3× Speed)
The chain uses a unique structure of small and large engineering-plastic rollers to achieve high conveying speed while keeping the chain speed low.
This ensures stable operation, low noise, and reduced wear.
Quality Materials
- Plastic rollers for high-speed, lightweight applications.
- Carbon steel plates for strength and stability
- Optional steel rollers/wheels for heavy-duty loads
Full Heat-Treatment Process
Every chain is produced with strict heat treatment, including:
annealing, normalizing, quenching, tempering, carburizing, nitriding, carbon–nitriding, and boriding.
This ensures:
- Higher tensile strength
- Superior fatigue resistance
- Longer operational life than conventional chains
Long Service Life
Made from premium steel and precision-processed components, the chain delivers extended durability even under continuous high-speed running.
One-Year Quality Guarantee
We provide a 1-year warranty for all Double Plus Chains sold, giving buyers confidence and long-term protection.
Reliable After-Sales Support
Our professional after-market team offers fast response and technical assistance to solve customer issues promptly.
Applications of Double Plus Chain
Double Plus Conveyor Chains are ideal for:
- Automotive production lines
- Motorcycle assembly lines
- Electronics manufacturing
- Household appliance assembly lines
- Automatic assembly systems
- Food and packaging industries
Suitable for lightweight conveying, and with steel rollers, they can also be used for mechanical product handling.
Structural Composition
A standard Double Plus Chain consists of:
- Inner chain plates
- Outer chain plates
- Pins
- Bushings
- Small rollers
- Large rollers
- Locking components
- Matching sprockets
Rollers are generally engineered-plastic die-cast, while heavy-duty versions can be equipped with steel components.
The chain is structurally based on a double-pitch roller chain, and the interaction between pins and outer plates forms a strong chain frame.
How Double Plus Chain Works
Differential Speed Mechanism
The chain itself moves slowly, but the tooling plate above moves several times faster due to rolling friction.
This provides three key advantages:
- High conveying speed with low chain speed
→ reduced noise, less vibration, long chain life. - Controlled movement
→ tooling plates can stop while the chain keeps running, enabling precise assembly rhythm control. - Lightweight system
→ faster startup, less wear, higher efficiency than traditional roller conveyors.
Customization Options
✔ Customizable: YES
Customers can provide detailed drawings for non-standard Double Plus Chain projects.
✔ Heat-Treatment Options:
- Annealing
- Normalizing
- Quenching
- Tempering
- Carburizing
- Nitriding
- Carbon–nitriding
- Boriding
✔ Surface Treatment Options:
- Black oxide / Bluing
- Shot blasting
Why Choose Our Double Plus Chain?
- Factory-direct manufacturing
- High-speed 3× performance
- Quality heat-treated steel components
- One-year product warranty
- Excellent after-sales technical support
- OEM/ODM customization available
Ready to order? Click to contact us now!
✔ WhatsApp: +86 188 2020 0782(135 3241 8537)
✔ Mail:[email protected]
✔ Fast response | Professional support | Factory direct price
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Frequently Asked Question
A Double Plus Chain is a high-speed conveyor chain that uses a combination of small and large rollers to achieve 2×–3× conveying speed while the chain itself runs slowly. It is widely used in automotive, motorcycle, electronics, and appliance assembly lines.
The chain uses a differential-speed design: small and large engineering-plastic rollers create rolling friction that allows the tooling plate to move several times faster than the chain. This ensures stable, fast, and low-noise conveying.
Rollers are typically made from engineering plastic (Nylon or POM) for lightweight, high-speed performance. Chain plates are made of carbon steel, and heavy-duty versions can be equipped with steel rollers or wheels.
Each chain undergoes full heat-treatment, including annealing, normalizing, quenching, tempering, carburizing, nitriding, carbon-nitriding, and boriding. This enhances strength, fatigue resistance, and service life.
Double Plus Chains are commonly used in automotive assembly lines, motorcycle factories, electronics manufacturing, home appliance conveyors, automatic assembly systems, packaging lines, and other high-speed light-load conveying applications.
Yes. We provide a 1-year quality warranty on all Double Plus Chains and offer OEM/ODM customization based on customer drawings, materials, heat-treatment requirements, or special structural designs.
