The main sizes of the tapered Tapered Roller Bearing china roller bearings comply with DIN ISO 355 and DIN 720. Dimensional and running tolerances match tolerance class PN acc. to DIN 620. These tolerance classes are standard and are well suited for most applications.
The bearings are separable. This means the bearing parts could be fitted independently of each other. The bearings are supplied without seals. They could be lubricated with grease or oil from the side.
The rollers are processed to create pore-like micro indents in the surface of the steel (rolling contact area and roller brain). This microstructure helps retain an oil film that’s perfect for tapered roller bearing applications. Improved oil film retention considerably 
inhibits surface damage, reaching more than eight circumstances higher toughness and equal or higher seizure resistance in comparison to conventional products.
Superior lubricant oil accumulation and retention (better to form oil film) in the roller surface plays a part in 10% lower friction for low speeds in comparison to conventional products.
Tapered roller bearings may accept great radial and axial loads. Axial loads are absorbed in mere one route. For axial counter support another bearing mounted inverse is required. Suitable for medium speeds.
Higher efficiency transmission systems are seen as key to improving fuel economy, so NSK attempt to develop a huge reliability bearing with the capacity of overcoming these hurdles.
To boost fuel economy, there’s been a shift to using less lubricant and/or reduce viscosity lubricant in transmission systems. Consequently, tapered roller bearings in transmissions will be being subject to increasingly severe lubrication conditions, increasing the risk of lubrication essential oil film depletion (lean lubrication conditions), surface damage, and bearing seizure.