The main measurements of the tapered roller bearings comply with 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 perfect for most applications.
The bearings are separable. This implies the bearing parts can be fitted independently of each various other. The bearings are provided without seals. They might 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 head). This microstructure helps keep an oil film that is well suited for tapered roller bearing applications. Improved essential oil film retention substantially inhibits surface damage, reaching more than eight moments higher strength and equal or increased seizure resistance compared to conventional products.
Better lubricant oil accumulation and retention (easier to form oil film) in the roller surface contributes to 10% lower friction at low speeds compared to conventional products.
Tapered roller bearings can accept great radial and axial loads. Axial loads are absorbed in only one path. For axial counter support another bearing installed 
inverse is required. Suitable for medium speeds.
Higher efficiency transmission systems have emerged as key to bettering gasoline economy, so NSK set out to develop a huge reliability bearing capable of overcoming these hurdles.
To improve fuel economy, there has been a shift to using less lubricant and/or decrease viscosity lubricant in transmitting systems. Subsequently, tapered roller bearings in transmissions will be being subject to increasingly severe lubrication conditions, increasing the chance of lubrication oil film depletion (lean lubrication conditions), surface harm, and bearing seizure.