The main sizes of the tapered roller bearings comply with DIN ISO 355 and DIN 720. Dimensional and running tolerances match tolerance school PN acc. to DIN 620. These tolerance classes are standard and are well suited for most applications.
The bearings are separable. This implies the bearing parts could be fitted independently of each other. The bearings are provided without seals. They are often 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 area and roller mind). This microstructure helps preserve an oil film that is well suited for tapered roller bearing applications. Improved essential oil film retention substantially inhibits surface damage, obtaining more than eight moments higher toughness and equal or greater Tapered Roller Bearing china seizure resistance in comparison to conventional products.
Improved upon lubricant oil accumulation and retention (simpler 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 substantial radial and axial loads. Axial loads are absorbed in only one way. For axial counter support another bearing mounted inverse is required. Suitable for medium speeds.
Higher efficiency transmission systems have emerged as key to improving fuel economy, so NSK set out to develop a substantial reliability bearing capable of overcoming these hurdles.
To improve fuel economy, there’s been a shift to using less lubricant and/or lower viscosity lubricant in tranny systems. Consequently, tapered roller bearings in transmissions are being subject to increasingly severe lubrication circumstances, increasing the risk of lubrication essential oil film depletion (lean lubrication circumstances), surface harm, and bearing seizure.