The main sizes of the tapered roller bearings comply with DIN ISO 355 and DIN 720. Dimensional and running tolerances correspond to tolerance course PN acc. to DIN 620. These tolerance classes are standard and are perfect for most applications.
The bearings are separable. This implies the bearing parts can be fitted independently of every various other. The bearings are provided without seals. They are often lubricated with grease or essential oil from the side.
The rollers are processed to create pore-like micro indents in the surface of the steel (rolling contact surface and roller brain). This microstructure helps keep an oil film that is perfect for tapered roller bearing applications. Improved essential oil film retention considerably inhibits surface damage, 
obtaining more than eight circumstances higher toughness and equal or better seizure resistance compared to conventional products.
Improved lubricant oil accumulation and retention (better to form oil film) in the roller surface contributes to 10% lower friction in low speeds in comparison to conventional products.
Tapered roller bearings can accept excessive radial and axial loads. Axial loads are absorbed in only one route. For axial counter support another bearing installed inverse is required. Suitable for medium speeds.
Larger efficiency transmission systems are seen as key to bettering petrol economy, so NSK attempt to develop a great reliability bearing capable of overcoming these hurdles.
To improve fuel economy, there has been a change to using less lubricant and/or reduced viscosity lubricant in transmission systems. Consequently, tapered roller bearings in transmissions are being subject to increasingly severe lubrication conditions, increasing the chance of lubrication essential oil film depletion (lean lubrication circumstances), surface harm, and bearing seizure.