The main measurements of the tapered roller bearings comply with 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 could be fitted independently of each various other. The bearings are provided without seals. They are often 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 surface and roller head). This microstructure helps maintain an oil film that is perfect for tapered roller bearing applications. Improved essential oil film retention drastically inhibits 
surface damage, attaining more than eight instances higher toughness and equal or increased seizure resistance in comparison to conventional products.
Increased lubricant oil accumulation and retention (better to form oil film) in the roller surface contributes to 10% lower friction at low speeds in comparison to conventional products.
Tapered roller bearings may accept excessive radial and axial loads. Axial loads are absorbed in only one direction. For axial counter support a second bearing mounted inverse is required. Ideal for medium speeds.
Bigger efficiency transmission systems are seen as key to improving fuel economy, so NSK set out to develop a substantial reliability bearing capable of overcoming these hurdles.
To boost 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 happen to be being subject to increasingly severe lubrication conditions, increasing the chance of lubrication oil film depletion (lean lubrication circumstances), surface harm, and bearing seizure.