The main dimensions of the tapered roller bearings conform to DIN ISO 355 and DIN 720. Dimensional and running tolerances match tolerance category 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 different. The bearings are provided without seals. They are often 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 area and roller brain). This microstructure helps retain an oil film that’s perfect for tapered roller bearing applications. Improved oil film retention considerably inhibits surface damage, achieving more than eight occasions higher sturdiness and equal or increased seizure resistance compared to conventional products.
Improved upon lubricant oil accumulation and retention (better to form oil film) in the roller surface plays a part in 10% lower friction by low speeds in comparison to conventional products.
Tapered roller bearings may accept excessive radial and axial loads. Axial loads happen to be absorbed in mere one path. For axial counter support another bearing mounted inverse is required. Suitable for medium speeds.
Larger efficiency transmission systems are seen as key to increasing gas economy, so NSK set out to develop a huge reliability bearing capable of overcoming these hurdles.
To improve fuel economy, there has been a shift to using less lubricant and/or reduce viscosity lubricant in transmission systems. 
Consequently, tapered roller bearings in transmissions happen to be being subject to increasingly severe lubrication conditions, increasing the risk of lubrication oil film depletion (lean lubrication conditions), surface damage, and bearing seizure.