Taper Roller Bearing
Product Specification

The inner and outer ring raceways are segments of cones and the rollers are also made with a taper so that the conical surfaces of the raceways and the roller axes if projected, would all meet at a common point on the main axis of the bearing.>

This conical geometry is used as it gives a larger contact patch, which permits greater loads to be carried than with spherical (ball) bearings, while the geometry means that the tangential speeds of the surfaces of each of the rollers are the same as their raceways along the whole length of the contact patch and no differential scrubbing occurs. When a roller slides rather than rolls, it can generate wear at the roller-to-race interface, i.e. the differences in surface speeds creates a scrubbing action. Wear will degenerate the close tolerances normally held in the bearing and can lead to other problems. Much closer to pure rolling can be achieved in a tapered roller bearing and this avoids rapid wear.

The rollers are guided by a flange on the inner ring. This stops the rollers from sliding out at high speed due to their momentum.

The larger the half angles of these cones the larger the axial force that the bearing can sustain.

Tapered roller bearings are separable and have the following components: outer ring, inner ring, and roller assembly (containing the rollers and a cage). The non-separable inner ring and roller assembly is called the cone, and the outer ring is called the cup. Internal clearance is established during mounting by the axial position of the cone relative to the cup.

Bearing No. d D T B C R Mass
LM 11949/11910 19.050 45.237 15.494 16.637 12.065 - 0.120
LM 11949/11910 0.750 1.781 0.610 0.655 0.475 - 0.120
LM 12749/12710 21.986 45.237 15.494 16.637 12.065 - 0.120
LM 12749/12710 0.866 1.781 0.610 0.655 0.475 - 0.120
LM 12749/12711 21.986 45.974 15.494 16.637 12.065 - 0.120
LM 12749/12711 0.866 1.810 0.610 0.655 0.475 - 0.120
LM 29748/29710 38.100 65.088 18.034 18.288 13.970 - 0.240
LM 29748/29710 1.500 2.563 0.710 0.720 0.550 - 0.240
LM 29749/29710 38.100 65.099 18.034 18.288 13.970 - 0.240
LM 29749/29710 1.500 2.563 0.710 0.720 0.550 - 0.240
LM 300849/300811 40.988 67.975 17.500 18.000 13.500 - 0.240
LM 300849/300811 1.614 2.676 0.689 0.709 0.532 - 0.240
LM 48548/48510 34.925 35.088 18.034 18.288 13.970 - 0.250
LM 48548/48510 1.375 2.563 0.710 0.720 0.550 - 0.250
LM 501349/501310 41.275 73.431 19.558 19.812 14.732 - 0.330
LM 501349/501310 1.625 2.891 0.770 0.780 0.580 - 0.330
LM 501349/501314 41.275 73.431 21.430 19.812 16.600 - 0.335
LM 501349/501314 1.625 2.891 0.844 0.780 0.654 - 0.335
LM 503349/503310 45.987 74.976 18.000 18.000 14.000 - 0.310
LM 503349/503310 1.811 2.952 0.709 0.709 0.551 - 0.310