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NBS roller type free wheels are comprised of two rings, inside which cylindrical rollers are housed. For each roller, the inner ring's outer profile has a rising ramp. When the rotational direction of the outer ring is in the direction of the rising ramp, the rollers tend to move towards the outside, causing the system to lock insofar as the friction blocks the outer and inner rings. In the opposite direction, the rollers are held in their housings and do not interfere with the motion.
NBS freewheels used for overrunning are designed in such a way as to allow a higher overrunning speed, minimising wear and overheating and thereby extending the life of the overrunning freewheel. 
NBS freewheels used as intermittent feed elements rely on the outer ring for intermittent feeding, whilst the inner ring is responsible for one-way transmission. 
If NBS freewheels are used as backstop devices, the overrunning speed can normally only be assigned to the inner ring. In this case, the maximum number of rotations allowed must be strictly respected, and low-viscosity oil is recommended for good lubrication, preferably with an oil circulation system. 

Typical applications of NBS freewheels for the three different uses, are respectively:
* starting a motor with an auxiliary motor;
* in processing lines with intermittent feed;
* for safety in one-way material or fluid channelling systems;
* etc.
KK … 2RS
KK … P
KK … P 2RS