The main dimensions of the tapered roller bearings conform to DIN ISO 355 and DIN 720. Dimensional and running tolerances correspond to 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 can be fitted independently of each various other. The bearings are provided without seals. They may 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 preserve an oil film that’s perfect for tapered roller bearing applications. Improved oil film retention substantially inhibits surface damage, reaching more than eight circumstances higher strength and equal or better seizure resistance in comparison to conventional products.
Superior lubricant oil accumulation and retention (better to form oil film) in the roller surface plays a part in 10% lower friction at low speeds compared to conventional products.
Tapered roller bearings may accept large radial and axial loads. Axial loads happen to be absorbed in only one course. For axial counter support a second bearing installed inverse is required. Ideal for medium speeds.
Higher efficiency transmission systems have emerged as key to increasing fuel economy, so NSK attempt to develop a huge reliability bearing with the capacity of overcoming these hurdles.
To improve fuel economy, there has been a change to using less lubricant and/or lessen viscosity lubricant in tranny systems. Consequently, tapered roller bearings in transmissions are being subject to 
increasingly severe lubrication conditions, increasing the risk of lubrication essential oil film depletion (lean lubrication circumstances), surface destruction, and bearing seizure.