Tapered roller bearings are designed so the tapered vertex of the raceway surfaces of the inner and outer rings and rollers converge at one point on the centerline of the bearing. Due to this design feature, rollers move along the center of the raceway surfaces. The tapered rollers are guided by the compound force of the inner and outer raceway surfaces which keep them pressed up against the large rib on the inner ring. A large veriety of these bearings, including single, double, and four row arrangements, are in use both in metric and inch series.

Four row tapered roller bearings are constructed of two double row inner rings and two double row outer rings. Life of large bearings is extended by using case hardened steel, hollow rollers and pin-type cages. Used primarily where heavy load capacity is important, and in the

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Designations	d	D	B	H	T	r min	Dynamic(C)	Static(Co)	Grease	Oil	Weight(kg)
77736	180	280	180		180	3	818	2490			39.6
77740	200	310	200		200	3	950	1490			55.6
2077140	200	310	275		275	3	1205	4120			75.1
77741	205	320	205		205	4	1040	2793			55.4
2077144	220	340	305		305	4	2245	5830			99.5
2077148	240	360	310		310	4	3230	2210			90.5
77750	250	460	270		270	5	2205	6270			792
77752	260	400	225		225	3.7	1450	4850			117
382052	260	400	345		345	5	2790	7540			161
777752	260	440	300		300	2	2620	5730			182
77756	280	420	250		250	5	1510	5200			119
2077160	300	460	390		390	5	3770	10000			222
77760	300	500	350		350	5	267	8720			280
2077164	320	480	380		380	5	2940	11370			252
2077968	340	460	310		310	4	2155	9120			147
381068	340	520	325		325	5	3136	8040			247
77872	360	400	375		375	4	2500	11560			197
1077772	360	600	420		420	4.7	3870	13500			388
7776	380	550	350		350	5	2440	9270			273
3077776	380	620	388		388	6	3400	11370			443