The main measurements of the tapered roller bearings comply with DIN ISO 355 and DIN 720. Dimensional and running tolerances match tolerance school PN acc. to DIN 620. These tolerance classes are standard and so are well suited for most applications.
The bearings are separable. This means the bearing parts can be fitted independently of each other. The bearings are supplied without seals. They might 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 area and roller brain). This microstructure helps keep an oil film that’s perfect for tapered roller bearing applications. Improved essential oil film retention considerably inhibits surface damage, achieving more than eight circumstances higher strength and equal or greater seizure resistance compared to conventional products.
Better lubricant oil accumulation and retention (easier to form 
oil film) in the roller surface plays a part in 10% lower friction for low speeds in comparison to conventional products.
Tapered roller bearings may accept great radial and axial loads. Axial loads are absorbed in mere one way. For axial counter support another bearing attached inverse is required. Ideal for medium speeds.
Larger efficiency transmission systems have emerged as key to improving gas economy, so NSK set out to develop a huge reliability bearing capable of overcoming these hurdles.
To boost fuel economy, there’s been a shift to using less lubricant and/or lessen viscosity lubricant in transmission systems. Therefore, tapered roller bearings in transmissions will be being subject to increasingly severe lubrication circumstances, increasing the chance of lubrication oil film depletion (lean lubrication circumstances), surface destruction, and bearing seizure.