The main dimensions of the tapered roller bearings conform to DIN ISO 355 and DIN 720. Dimensional and running tolerances match tolerance school 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 could be fitted independently of every different. The bearings are provided without seals. They could be 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 mind). This microstructure helps keep an oil film that is well suited for tapered roller bearing applications. Improved oil film retention considerably inhibits surface damage, attaining more than eight circumstances higher durability and equal or better seizure resistance in comparison to conventional products.
Superior lubricant oil accumulation and retention (easier to form oil film) in the roller surface contributes to 10% lower friction for low speeds in comparison to conventional products.
Tapered roller bearings may accept great radial and axial loads. Axial loads happen to be absorbed in mere one way. For axial counter support another bearing mounted inverse is required. Suitable for medium speeds.
Bigger efficiency transmission systems are seen as key to improving energy economy, so NSK attempt to develop a substantial reliability bearing capable of overcoming these hurdles.
To boost fuel economy, there’s been a shift to using less lubricant and/or reduced viscosity lubricant in tranny systems. Consequently, tapered roller bearings in transmissions will be being subject to increasingly severe lubrication circumstances, increasing the chance of lubrication oil film depletion (lean lubrication circumstances), surface damage, and bearing seizure.