420RO Sealed Chain
seal chain structure
| Pin | The link connecting the outer links is the central axis of the chain bend. |
| Bushing | The chain plate connected to the inside is the supporting force axis of the pin shaft. |
| Roller | Contact with the sprocket to make the chain roll smoothly. |
| Inner/outer chain link | Together with the pin, it supports the transmission of load and power. |
| Seal Ring | Lubricating grease sealed between the pin and the bushing. |
| lubricating oil | Provide lubrication between pins and bushings to prevent wear and elongation. |
Product data information
| Specification | unit | 420RO |
| Pitch（P) | mm | 12.70 |
| Inner section width(W)（Min.) | mm | 6.25 |
| Roller outerdiameter(D)(Max.) | mm | 7.77 |
| Outer link plateThickness（T1) | mm | 1.50 |
| Inner link plate headThickness(T2) | mm | 1.50 |
| Inner chain plate headWidth(H) | mm | 11.80 |
| Pin diameter(d) | mm | 3.95 |
| Pin length(L) | mm | 17.00 |
| Shaft length(G) | mm | 18.60 |
| Minimum tensile strength | kgf | 1640 |
| Average tensile strength | kfg | 1850 |
| Maximum exhaust volume | cc | 90 |
Product Information
The sealed-in lubrication is specially engineered to maximize the chain’s service life. Made from superior alloy steel and enhanced through advanced heat treatment, the chain delivers exceptional strength and durability. A specially formulated grease, securely retained by a durable sealing ring between the solid bushing and hardened pin, ensures continuous lubrication. This design significantly reduces friction during operation, minimizes wear, prevents excessive chain stretch, and extends overall chain longevity.
Applications
- motorcycle
Product Advantages
✔ Increased Durability & Reliability
✔ Zero-Maintenance Design
✔ Eco-Friendly Compliance
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Frequently Asked Question
sealed chain comes with O-rings or X-rings that lock in lubrication and block out dust and dirt. It’s way more durable than standard chains!
Absolutely! Sealed chains are built for harsh environments. The seals keep mud, water, and grit out, making them perfect for off-road adventures.
Yes, they cost a bit more—but they last much longer and require less maintenance, so they save you money in the long run!
Yes! The O/X-rings are tightly pressed between the inner and outer links, locking in grease and keeping the chain running smooth.
Not anymore! Modern sealed chains have ultra-low friction. You get smooth, stable performance without sacrificing speed.
Not at all! Just wipe down the outside with a chain cleaner. The internal lubrication is sealed in, so you don’t need to lube as often.
Sealed chains are used on everything from dirt bikes to racing motorcycles to street bikes—even in industrial machinery!
The seals are extremely durable. Most sealed chains last 10,000–15,000 km or more, depending on riding style and conditions.
Very unlikely! They’re made with heat-treated high-grade alloy steel, and the sealed lubrication drastically reduces wear and fatigue.
