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 perfect for most applications.
The bearings are separable. This implies the bearing parts could be fitted independently of each additional. The bearings are provided without seals. They can be lubricated with grease or oil from the side.
The rollers are processed to create pore-like micro indents in the top of steel (rolling contact surface and roller brain). This microstructure helps retain an oil film that’s well suited for tapered roller bearing applications. Improved oil film retention significantly inhibits surface damage, attaining more than eight situations higher strength and equal or greater seizure resistance compared to conventional products.
Increased lubricant oil 
accumulation and retention (simpler to form oil film) in the roller surface plays a part in 10% lower friction in low speeds compared to conventional products.
Tapered roller bearings may accept high radial and axial loads. Axial loads will be absorbed in mere one path. For axial counter support another bearing attached inverse is required. Ideal for medium speeds.
Larger efficiency transmission systems are seen as key to increasing petrol economy, so NSK set out to develop a huge reliability bearing with the capacity of overcoming these hurdles.
To boost fuel economy, there’s been a change to using less lubricant and/or cheaper viscosity lubricant in transmitting systems. Therefore, 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.