The main dimensions of the tapered roller bearings comply with DIN ISO 355 and DIN 720. Dimensional and running tolerances correspond to tolerance category PN acc. to DIN 620. 
These tolerance Tapered Roller Bearing china classes are standard and are well suited for most applications.
The bearings are separable. This implies the bearing parts could be fitted independently of every various other. The bearings are provided without seals. They may 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 surface area and roller brain). This microstructure helps keep an oil film that’s perfect for tapered roller bearing applications. Improved oil film retention drastically inhibits surface damage, achieving more than eight times higher durability and equal or greater seizure resistance in comparison to conventional products.
Improved upon lubricant oil accumulation and retention (easier to form oil film) in the roller surface contributes to 10% lower friction at low speeds in comparison to conventional products.
Tapered roller bearings may accept high radial and axial loads. Axial loads are absorbed in mere one direction. For axial counter support a second bearing installed inverse is required. Suitable for medium speeds.
Higher efficiency transmission systems have emerged as key to improving energy economy, so NSK set out to develop a substantial reliability bearing with the capacity of overcoming these hurdles.
To boost fuel economy, there has been a change to using less lubricant and/or reduced viscosity lubricant in transmission systems. As a result, tapered roller bearings in transmissions are being subject to increasingly severe lubrication conditions, increasing the risk of lubrication essential oil film depletion (lean lubrication circumstances), surface harm, and bearing seizure.