The main sizes of the tapered roller bearings conform to 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 each other. The bearings are provided without seals. They could 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 and roller mind). This microstructure helps retain an oil film that's perfect for tapered roller bearing applications. Improved essential oil film retention substantially inhibits surface damage, achieving more than eight occasions higher toughness and equal or greater seizure resistance compared to conventional 
products.
Better lubricant oil accumulation and retention (simpler to form oil film) in the roller surface contributes to 10% lower friction in low speeds compared to conventional products.
Tapered roller bearings may accept substantial radial and axial loads. Axial loads happen to be absorbed in mere one path. For axial counter support a second bearing installed inverse is required. Suitable for medium speeds.
Higher efficiency transmission systems have emerged as key to increasing petrol economy, so NSK set out to develop a excessive reliability bearing with the capacity of overcoming these hurdles.
To boost fuel economy, there's been a shift to using less lubricant and/or reduced viscosity lubricant in transmission systems. Consequently, tapered roller bearings in transmissions will be being at the mercy of increasingly severe lubrication circumstances, increasing the risk of lubrication oil film depletion (lean lubrication conditions), surface damage, and bearing seizure.