Guide To Tapered Roller Bearings

In modern industrial machinery, there are many types of bearings due to the differences in material, structure, precision, size, load direction, application, etc., and tapered roller bearings are an indispensable and important part of bearings.

Tapered roller bearings have multiple advantages, for example, low friction, low noise, low vibration, strong durability, separable structure (simplified installation), and so on. They are widely used in automobiles, mining, rolling mills, agricultural machinery, machine tools, etc. various fields.

Choosing a suitable tapered roller bearing will not only affect the machines' operating performance and efficiency but also the reliability and durability of the mechanical equipment.

LNB Company is a professional bearing manufacturer. In order to make users better understand tapered roller bearings, we will introduce the tapered roller bearing meaning, tapered roller bearing model, tapered roller bearing application, etc. in detail, and will list the tapered roller bearing size chart for user reference. If customers have any questions or requirements, please contact us at any time!

What is a tapered roller bearing?

1. Tapered Roller Bearing Definition

When designing a tapered roller bearing, the three extensions of its inner and outer raceway generatrix and the roller centerline intersect at a point on the bearing centerline. Therefore, the roller achieves pure rolling on the raceway.

Tapered roller bearings are particularly suitable for bearing radial loads, and unidirectional axial loads and their combined loads. Its ability to bear axial loads depends on the contact angle (outer ring raceway angle). The larger the angle, the greater the axial load capacity. Even if used to bear pure radial loads, there will be axial force components, so two sets of bearings are usually used in pairs.

2. Deep Groove Ball Bearing Classification

(1) Single-row tapered roller bearing

Single-row tapered roller bearings are the most widely used tapered roller bearings. They have one row of rollers, consisting of a tapered inner ring assembly and an outer ring.

The rated dynamic load ratio of single-row tapered roller bearings is 1.5 to 2.5. They can withstand unidirectional axial loads and will generate additional axial forces under radial loads. They are generally used in pairs.

The single-row tapered roller bearing' s cone angle of the outer ring raceway is between 10° and 19°, and it can withstand the combined effects of axial and radial loads at the same time. The larger the cone angle, the greater the ability to withstand axial loads. And bearings with large cone angles have a post-code of B and a cone angle between 25° and 29°, they can withstand larger axial loads.

In addition, single-row tapered roller bearings have a relatively high limit speed, they can limit the axial displacement of the shaft and housing in one direction and can adjust the the clearance size during installation.

(2) Double-row tapered roller bearings

Double-row tapered roller bearings have two rows of rollers. The outer ring (or inner ring) is an integral whole. The small end faces of the two inner rings (or outer rings) are close to each other, and there is a spacer in the middle.

The double-row tapered roller bearings' rated dynamic load ratio is 2.6~4.3. They can simultaneously withstand large radial loads and bidirectional axial loads and are suitable for heavy loads or high-vibration conditions.

The double-row tapered roller bearings' limit speed is medium, and the axial displacement of the shaft and the housing can be limited within the axial clearance range. The bearings' radial clearance can be adjusted by changing the thickness of the spacer.

(3) Four-row tapered roller bearings

Four-row tapered roller bearings contain four rows of rollers and have a more complex design.

The rated dynamic load ratio of four-row tapered roller bearings is 4.5~7.4. Their performance is basically the same as that of double-row tapered roller bearings, but four-row tapered roller bearings can withstand larger radial loads than double-row tapered roller bearings and have a slightly lower limit speed, mainly used in heavy machinery.

Four-row tapered roller bearings can limit the axial displacement of the shaft and housing within the axial clearance range, and the radial clearance of the bearing also can be adjusted by changing the thickness of the spacer.

(4) Matched tapered roller bearings

Matched tapered roller bearings combine two or more tapered roller bearings in a specific way to achieve better load distribution and improve stiffness. This match can be coaxially mounted or relatively mounted and is usually used to withstand complex load conditions.

There are usually three designs and variations: matched bearings arranged face to face, matched bearings arranged back to back, and matched bearings arranged in series.

Matched tapered roller bearings can effectively disperse the load and reduce contact stress, thereby extending the service life of the machine. They are suitable for working conditions with high loads, vibrations, and large temperature changes.

(5) Thrust tapered roller bearings

The shaft and bearing seat gasket of the thrust tapered roller bearing(with a cage), as well as the roller and cage thrust components, can be installed separately. It has the advantages of low friction, high load capacity, and long service lifespan.

3. Tapered Roller Bearing Properties

(1) Tapered Roller Bearing Dimensions

Tapered roller bearings are available in two sizes: Metric series and Imperial series, both of which are widely used.

The basic dimensions of metric series bearings conform to ISO 355; bearings with the prefix F-J conform to ANSI/ABMA Standard 19.1. The dimensions of imperial tapered roller bearings conform to AFBMA Standard 19.

Common dimension symbols for tapered roller bearings are as follows (single row):

d: inner diameter

D: outer diameter

B: inner ring width

C: outer ring width

E: outer ring back inner diameter

r: inner ring back chamfer dimension

r_smin: inner ring back minimum single chamfer dimension

r₁: outer ring back chamfer dimension

r_1smin: outer ring back minimum single chamfer dimension

r₂: outer and inner ring front chamfer dimensions

T: bearing width

α: contact angle

(2) Tapered Roller Bearing Tolerance

The inner ring assembly and outer ring of tapered roller bearings with the same roller and cage code are interchangeable. When the inner ring assembly and outer ring are interchangeable, the total bearing width T cannot exceed the tolerance range.

LNB Bearing's metric tapered roller bearings usually have normal tolerances, and also provide P6X, P6, P5, P4, and P2 tolerance products, all in accordance with GB307.1.

LNB's inch tapered roller bearings usually have normal tolerances, and can also provide CL2, CL3, CL0, CL00 tolerance products as required.

(3) Tapered Roller Bearing Internal clearance and preload

Single-row tapered roller bearings only have internal clearance after installation and can only be determined after adjustment of another bearing positioned in the opposite direction.

The preload of single-row tapered roller bearings is also obtained after installation and depends on the adjustment of the second bearing.

4. Tapered Roller Bearing Advantages & Limitations

(1) Tapered Roller Bearing Advantages

• High load-carrying capability, and capacity to bear both axial (thrust) and radial loads;

• Low friction, noise and vibration;

• Strong adaptability and long service life;

• Increased operating reliability even under difficult conditions;

• Precision and accuracy of operation;

• Separable and interchangeable parts facilitate installation, disassembly and maintenance, etc.

(2) Tapered Roller Bearing Limitations

• Speed limit: The tapered roller bearing may be inadaptable for high-speed working.

• High installing requirement: The tapered roller bearing is sensitive to the deviation in problems and needs installation in a very precise alignment.

• Sensitive: The tapered roller bearing is extremely sensitive to lubrication status and working environment, lack of lubrication can lead to failure.

In a nutshell, the performances of the tapered roller bearings are outstanding in high-precision applications, heavy load, and high stability. However, it is necessary to think over its shortcomings when choosing it. Under reasonable use and maintenance, fully playing its advantages can improve the effectiveness of the machine and ensure long-term stability of the operation of machinery and equipment.

5. Tapered Roller Bearing Application

Tapered roller bearings are widely applied and they play a role in various fields. Such as the automotive industry, heavy machinery, agricultural equipment, industrial gearboxes, etc.

(1) Single-row tapered roller bearing

Single-row tapered roller bearings are generally used in medium-speed, heavy-load, and durable applications, such as gear systems and transmissions, gear reducers, and agricultural wheels. Machine tool spindles, automotive drive axles, etc. Single-row tapered roller bearings can also be used in groups. Depending on the working conditions, single-row tapered roller bearings can be matched face-to-face, back-to-back, or in series to provide specific advantages.

(2) Double-row tapered roller bearing

Double-row tapered roller bearings have a stronger load-bearing capacity, can withstand heavier radial loads, and axial loads in two directions, and have high rigidity. They are usually used in gearboxes, lifting equipment, mining equipment, construction machinery, rolling mills, and mining machinery.

(3) Four-row tapered roller bearing

Four-row tapered roller bearings have a very strong load-bearing capacity and are suitable for high-load and low-speed occasions. They have a complex design. They are usually used in heavy machines such as large cold and hot rolling mills.

Tapered Roller Bearing Size Chart

Tapered roller bearings mainly include 30000 series, 350000 series, 380000 series, etc.

As a professional bearing manufacturer, LNB bearing provides a full range of tapered roller bearings with different precision (P0-P6), different ABEC tolerances (1-9 grades), different clearances (C2-C4), and so on.

1. 30000 series

The 30000 series is usually a single-row tapered roller bearing, suitable for bearing large radial loads and unidirectional axial loads, and has a wide range of applications.

(1) 30200 Series

Model	d (mm)	D (mm)	B (mm)	C (mm)	T (mm)	Weight (kg)
30202	15	35	11	10	11.75	0.053
30203	17	40	12	11	13.25	0.079
30204	20	47	14	12	15.25	0.126
30205	25	52	15	13	16.25	0.154
30206	30	62	16	14	17.25	0.241
30207	35	72	17	15	18.25	0.331
30208	40	80	18	16	19.25	0.422
30209	45	85	19	16	20.75	0.474
30210	50	90	20	17	21.75	0.529
30211	55	100	21	18	22.75	0.713
30212	60	110	22	19	23.75	0.904
30213	65	120	23	20	24.75	1.130
30214	70	125	24	21	26.25	1.260
30215	75	130	25	22	27.25	1.360
30216	80	140	26	22	28.25	1.670
30217	85	150	28	24	30.5	2.060
30218	90	160	30	26	32.5	2.540
30219	95	170	32	27	34.5	3.040
30220	100	180	34	29	37	3.720
30221	105	190	36	30	39	4.380
30222	110	200	38	32	41	5.210
30224	120	215	40	34	43.5	6.200
30226	130	230	40	34	43.75	6.940
30228	140	250	42	36	45.75	8.730
30230	150	270	45	38	49	10.800
30232	160	290	48	40	52	13.300
30234	170	310	52	43	57	16.600
30236	180	320	52	43	57	17.300
30238	190	340	55	46	60	20.800
30240	200	360	58	48	64	24.700

(2) 30300 Series

Model	d (mm)	D (mm)	B (mm)	C (mm)	T (mm)	Weight (kg)
30303	17	47	14	12	15.25	0.129
30304	20	52	15	13	16.25	0.165
30305	25	62	17	15	18.25	0.263
30306	30	72	19	16	20.75	0.387
30307	35	80	21	18	22.75	0.515
30308	40	90	23	20	25.25	0.7479
30309	45	100	25	22	27.25	0.984
30310	50	110	27	23	29.25	1.280
30311	55	120	29	25	31.5	1.630
30312	60	130	31	26	33.5	1.991
30313	65	140	33	28	36	2.440
30314	70	150	35	30	38	2.980
30315	75	160	37	31	31.97	3.570
30316	80	170	39	33	42.5	4.270
30317	85	180	41	34	44.5	4.960
30318	90	190	43	36	46.5	5.800
30319	95	200	45	38	49.5	6.800
30320	100	215	47	39	51.5	8.220
30321	105	225	49	41	53.5	9.380
30322	110	240	50	42	54.5	11.000
30324	120	260	55	46	59.5	14.200
30326	130	280	58	49	63.75	17.300
30328	140	300	62	53	67.75	21.400
30330	150	320	65	55	72	25.200
30332	160	340	68	58	75	29.500
30334	170	360	72	62	80	35.600
30336	180	380	75	64	83	40.700
30352	260	540	102	85	114	110.000

(3) 31300 Series

Model	d (mm)	D (mm)	B (mm)	C (mm)	T (mm)	Weight (kg)
31306	30	72	19	14	20.75	0.392
31307	35	80	21	15	22.75	0.514
31308	40	90	23	17	25.25	0.728
31309	45	100	25	18	27.25	0.943
31310	50	110	27	19	29.25	1.210
31311	55	120	29	21	31.5	1.557
31312	60	130	31	22	33.5	1.900
31313	65	140	33	23	36	2.370
31314	70	150	35	25	38	2.860
31315	75	160	37	26	40	3.380
31316	80	170	39	27	42.5	4.050
31317	85	180	41	28	44.5	4.690
31318	90	190	43	30	46.5	5.460
31319	95	200	45	32	49.5	6.460
31320	100	215	51	35	56.5	8.590
31321	105	225	53	36	58	9.580
31322	110	240	57	38	63	12.100
31324	120	260	62	42	68	15.300
31326	130	280	66	44	72	18.400
31328	140	300	70	47	77	22.800
31330	150	320	75	50	82	27.400

(4) 32000 Series

Model	d (mm)	D (mm)	B (mm)	C (mm)	T (mm)	Weight (kg)
32004	20	42	15	12	15	0.095
32005	25	47	15	11.5	15	0.110
32006	30	55	17	13	17	0.170
32007	35	62	18	14	18	0.224
32008	40	68	19	14.5	19	0.267
32009	45	75	20	15.5	20	0.337
32010	50	80	20	15.5	20	0.365
32011	55	90	23	17.5	23	0.551
32012	60	95	23	17.5	23	0.584
32013	65	100	23	17.5	23	0.620
32014	70	110	25	19	25	0.839
32015	75	115	25	19	25	0.875
32016	80	125	29	22	29	1.270
32017	85	130	29	22	29	1.320
32018	90	140	32	24	32	1.720
32022	110	170	38	29	38	3.020
32024	120	180	38	29	38	3.180
32026	130	200	45	34	45	4.940
32028	140	210	45	34	45	5.150
32030	150	225	48	36	48	6.250
32032	160	240	51	38	51	7.660
32034	170	260	57	43	57	10.400
32036	180	280	64	48	64	14.100
32038	190	290	64	48	64	14.600
32040	200	310	70	53	70	18.900
32044	220	340	76	57	76	24.400
32048	240	360	76	57	76	25.900
32052	260	400	87	65	87	38.000
32056	280	420	87	65	87	40.200
32060	300	460	100	74	100	57.500
32064	320	480	100	74	100	60.600

(5) 32200 Series

Model	d (mm)	D (mm)	B (mm)	C (mm)	T (mm)	Weight (kg)
32205	25	52	18	16	19.25	0.187
32206	30	62	20	17	21.25	0.287
32207	35	72	23	19	24.25	0.445
32208	40	80	23	19	24.75	0.532
32209	45	85	23	19	24.75	0.573
32210	50	90	23	19	24.75	0.626
32212	60	110	28	24	29.75	1.169
32215	75	130	31	27	33.25	1.740
32217	85	150	36	30	38.5	2.680
32218	90	160	40	34	42.5	3.440
32219	95	170	43	37	45.5	4.240
32221	105	190	50	43	53	6.260
32222	110	200	53	46	56	7.430
32228	140	250	68	58	71.75	14.400
32232	160	290	80	67	84	23.300
32234	170	310	86	71	91	28.600
32236	180	320	86	71	91	29.900
32238	190	340	92	75	97	36.100
32240	200	360	98	82	104	43.200

(6) 32300 Series

Model	d (mm)	D (mm)	B (mm)	C (mm)	T (mm)	Weight (kg)
32303	17	47	19	16	20.25	0.173
32304	20	52	21	18	22.25	0.230
32305	25	62	24	20	25.25	0.368
32306	30	72	27	23	28.75	0.562
32307	35	80	31	25	32.75	0.763
32308	40	90	33	27	35.25	1.040
32309	45	100	36	30	38.25	1.403
32310	50	110	40	33	42.25	1.890
32311	55	120	43	35	45.5	2.369
32312	60	130	46	37	48.5	2.900
32313	65	140	48	39	51	3.514
32314	70	150	51	42	54	4.340
32315	75	160	55	45	58	5.370
32316	80	170	58	48	61.5	6.380
32317	85	180	60	49	63.5	7.310
32318	90	190	64	53	67.5	8.810
32319	95	200	67	55	71.5	10.100
32320	100	215	73	60	77.5	13.000
32321	105	225	77	63	81.5	14.800
32322	110	240	80	65	84.5	17.800
32324	120	260	86	69	90.5	22.100
32326	130	280	93	78	98.75	28.313
32330	150	320	108	90	114	41.922

(7) 32900 Series

Model	d (mm)	D (mm)	B (mm)	C (mm)	T (mm)	Weight (kg)
32904	20	37	12	9	12	0.056
32905	25	42	12	9	12	0.064
32906	30	47	12	9	12	0.072
32907	35	55	14	11.5	14	0.114
32908	40	62	15	12	15	0.155
32909	45	68	15	12	15	0.180
32910	50	72	15	12	15	0.181
32911	55	80	17	14	17	0.262
32912	60	85	17	14	17	0.279
32913	65	90	17	14	17	0.295
32914	70	100	20	16	20	0.471
32915	75	105	20	16	20	0.495
32916	80	110	20	16	20	0.514
32917	85	120	23	18	23	0.767
32918	90	125	23	18	23	0.796
32919	95	130	23	18	23	0.831
32920	100	140	25	20	25	1.120
32921	105	145	25	20	25	1.160
32922	110	150	25	20	25	1.200
32924	120	165	29	23	29	1.780
32926	130	180	32	25	32	2.340
32928	140	190	32	25	32	2.470
32930	150	210	38	30	38	3.870
32932	160	220	38	30	38	4.070
32934	170	230	38	30	38	4.330
32936	180	250	45	34	45	6.440
32938	190	260	45	34	45	6.660
32940	200	280	51	39	51	9.430
32944	220	300	51	39	51	10.000
32948	240	320	51	39	51	10.700
32952	260	360	63.5	48	63.5	18.600
32956	280	380	63.5	48	63.5	19.700
32960	300	420	76	57	76	31.500
32964	320	440	76	57	76	33.300
32968	340	460	76	57	76	34.800
32972	360	480	76	57	76	36.300

(8) 33000 Series

Model	d (mm)	D (mm)	B (mm)	C (mm)	T (mm)	Weight (kg)
33005	25	47	17	14	17	0.129
33006	30	55	20	16	20	0.203
33007	35	62	21	17	21	0.254
33008	40	68	22	18	22	0.306
33009	45	75	24	19	24	0.398
33010	50	80	24	19	24	0.433
33011	55	90	27	21	27	0.651
33012	60	95	27	21	27	0.691
33016	80	125	36	29.5	36	1.630
33017	85	130	36	29.5	36	1.690
33018	90	140	39	32.5	39	2.200
33019	95	145	39	32.5	39	2.260
33020	100	150	39	32.5	39	2.330
33021	105	160	43	34	43	2.970
33022	110	170	47	37	47	3.740
33028	140	210	56	44	56	6.570
33108	40	75	26	20.5	26	0.496
33109	45	80	26	20.5	26	0.535
33110	50	85	26	20	26	0.572
33111	55	95	30	23	30	0.843
33112	60	100	30	23	30	0.895
33113	65	110	34	26.5	34	1.300
33114	70	120	37	29	37	1.700
33115	75	125	37	29	37	1.780
33116	80	130	37	29	37	1.870
33118	90	150	45	35	45	3.130
33119	95	160	49	38	49	3.940
33120	100	165	52	40	52	4.310
33121	105	175	56	44	56	5.290
33122	110	180	56	43	56	5.505
33124	120	200	62	48	62	7.680
33205	25	52	22	18	22	0.220
33206	30	62	25	19.5	25	0.342
33207	35	72	28	22	28	0.516
33208	40	80	32	25	32	0.715
33209	45	85	32	25	32	0.771
33210	50	90	32	24.5	32	0.825
33211	55	100	35	27	35	1.150
33212	60	110	38	29	38	1.511
33213	65	120	41	32	41	1.990
33214	70	125	41	32	41	2.097
33215	75	130	41	31	41	2.170
33216	80	140	46	35	46	2.830
33217	85	150	49	37	49	3.520
33218	90	160	55	42	55	4.550
33219	95	170	58	44	58	5.480
33220	100	180	63	48	63	6.710
33221	105	190	68	52	68	8.120

2. 350000 Series

The 350000 series is usually a double-row tapered roller bearing, which can carry large radial and bidirectional axial loads at the same time. The load-bearing capacity is stronger than the 30000 series, suitable for high loads and complex working conditions.

(1) 351000 Series

Model	d (mm)	D (mm)	B1 (mm)	C1 (mm)	b1 (mm)
351305 E	25	62	42	31.5	8
351306 E	30	72	47	33.5	9
351307 E	35	80	51	35.5	9
351308 E	40	90	56	39.5	10
351309 E	45	100	60	41.5	10
351310 E	50	110	64	43.5	10
351311 E	55	120	70	49	12
351312 E	60	130	74	51	12
351313 E	65	140	79	53	13
351314 E	70	150	83	57	13
351315 E	75	160	88	60	14
351316 E	80	170	94	63	16
351317 E	85	180	99	66	17
351318 E	90	190	103	70	17
351319 E	95	200	109	74	19
351320 E	100	215	124	81	22
351321 E	105	225	127	83	21
351322 E	110	240	137	87	23
351324 E	120	260	148	96	24
351326 E	130	280	156	100	24
351328 E	140	300	168	108	28
351330 E	150	320	178	114	28
351160	300	500	205	165	25
351068	340	520	180	135	16
351168	340	580	242	170	30
351072	360	540	185	140	21
351172	360	600	242	170	30
351976	380	520	145	105	15
351076	380	560	190	140	26
351176	380	620	242	170	30
351980	400	540	150	105	20
351080	400	600	206	150	26
351984	420	560	145	105	15
351084	420	620	206	150	26
351184	420	700	275	200	31
351988	440	600	170	125	22
351088	440	650	212	152	24
351992	460	620	174	130	26
351092	460	680	230	175	30
351996	480	650	180	130	24
351096	480	700	240	180	40
351196	480	790	310	224	38

(2) 352000 Series

Model	d (mm)	D (mm)	B1 (mm)	C1 (mm)	b1 (mm)
352208 E	40	80	55	43.5	9
352209 E	45	85	55	43.5	9
352210 E	50	90	55	43.5	9
352211 E	55	100	60	48.5	10
352212 E	60	110	66	54.5	10
352213 E	65	120	73	61.5	11
352214 E	70	125	74	61.5	12
352215 E	75	130	74	61.5	12
352216 E	80	140	78	63.5	12
352217 E	85	150	86	69	14
352218 E	90	160	94	77	14
352219 E	95	170	100	83	14
352220 E	100	180	107	87	15
352221 E	105	190	115	95	15
352122	110	180	95	76	11
352222 E	110	200	121	101	15
352124	120	200	110	90	14
352224 E	120	215	132	109	16
352126	130	210	110	90	14
352226 E	130	230	145	117.5	17
352128	140	225	115	90	15
352228 E	140	250	153	125.5	17
352130	150	250	138	112	18
352230 E	150	270	164	130	18
352132	160	270	150	120	18
352232 E	160	290	178	144	18
352134	170	280	150	120	18
352234 E	170	310	192	152	20
352136	180	300	164	134	20
352236 E	180	320	192	152	20
352138	190	320	170	130	14
352238 E	190	340	204	160	20
352140	200	340	184	150	20
352240 E	200	360	218	174	22
352144	220	370	195	150	19
352148	240	400	210	163	20
352152	260	440	225	180	13

3. 380000 Series

The 380000 series is usually a four-row tapered roller bearing with a complex design. Its load capacity is higher than that of the 30000 and 350000 series tapered roller bearings. It can withstand extremely large loads and is suitable for low-speed and heavy-load conditions.

Model	d (mm)	D (mm)	B1 (mm)	C1 (mm)	b1 (mm)
382028	140	210	185	14	17.5
382930	150	210	165	10	17.5
382034	170	260	230	14	22
382040	200	310	275	14	24.5
382044	220	340	305	14	31.5
382048	240	360	310	14	34
382952	260	360	265	14	29.5
382052	260	400	345	16	34.5
381156	280	460	324	16	30
382960	300	420	300	14	29
382060	300	460	390	20	37
381160	300	500	370	15	39
382064	320	480	390	20	37
382968	340	460	310	14	34
381068	340	520	325	8	31
381168	340	580	425	16	50.5
381072	360	540	325	13	28.5
381076	380	560	325	16	30.5
381176	380	620	420	20	48
381080	400	600	356	16	36
381084	420	620	356	16	36
381184	420	700	480	15	48
381088	440	650	376	16	44
381992	460	620	310	14	32
381092	460	680	410	20	39
381996	480	650	338	20	39
381096	480	700	420	20	40