SKF Single row tapered roller bearings are for combined loads, i.e. simultaneously radial and axial loads. The racetrack projection lines meet at a common point on the bearing axle to provide true rolling action and therefore low friction moments during operation. The axial load capacity of tapered roller bearings increases with increasing contact angle a. The size of the contact angle, which is usually between 10° and 30°, is related to the calculation factor: the larger the value e, the larger the contact angle.