The main measurements of the tapered roller bearings conform to DIN ISO 355 and DIN 720. Dimensional and running tolerances match tolerance category PN acc. to DIN 620. These tolerance classes are standard and so are well suited for most applications.
The bearings are separable. This means the bearing parts can be fitted independently of each 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 top of steel (rolling contact surface area and roller head). This microstructure helps maintain an oil film that is well suited for tapered roller bearing applications. Improved oil film retention significantly inhibits surface 
damage, obtaining more than eight times higher toughness and equal or increased seizure resistance in comparison to conventional products.
Increased 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 great radial and axial loads. Axial loads will be absorbed in only one direction. For axial counter support another bearing mounted inverse is required. Suitable for medium speeds.
Higher efficiency transmission systems are seen as key to increasing gasoline economy, so NSK set out to develop a great reliability bearing with the capacity of overcoming these hurdles.
To improve fuel economy, there’s been a shift to using less lubricant and/or lower viscosity lubricant in transmission systems. Because of this, tapered roller bearings in transmissions are being at the mercy of increasingly severe lubrication Tapered Roller Bearing china circumstances, increasing the risk of lubrication oil film depletion (lean lubrication conditions), surface harm, and bearing seizure.