The main dimensions 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 means the bearing parts could be fitted independently of each other. The bearings are supplied 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 area and roller brain). This microstructure helps maintain an oil film that’s perfect for tapered roller bearing applications. Improved oil film retention significantly inhibits surface damage, obtaining more than eight times higher toughness and equal or better seizure resistance compared to conventional products.
Increased lubricant oil accumulation and retention (better to form oil film) in the roller surface contributes to 10% lower friction in low speeds compared to conventional products.
Tapered roller bearings can accept huge radial and axial loads. Axial loads will be absorbed in mere one direction. For axial counter support another bearing mounted inverse is required. Ideal for medium speeds.
Higher efficiency transmission systems are 
seen as key to improving petrol economy, so NSK set out to develop a huge reliability bearing with the capacity of overcoming these hurdles.
To improve fuel economy, there’s been a shift to using less lubricant and/or reduced viscosity lubricant in tranny systems. Because of this, tapered roller bearings in transmissions will be being subject to increasingly severe lubrication conditions, increasing the risk of lubrication essential oil film depletion (lean lubrication conditions), surface damage, and bearing seizure.
