331138 AG Four-Row Tapered Roller Bearing

Four-Row Tapered Roller Bearings: Heavy-Duty Applications
Four-row tapered roller bearings are a specialized design primarily used to accommodate extremely high radial loads and partial axial loads. They are commonly employed in heavy machinery such as rolling mills (e.g., four-high hot rolling mills, cold rolling mills) and blooming mills. Their design features rollers arranged on four tapered outer rings, resulting in high load capacity and extended service life. Furthermore, their clearance can be pre-adjusted by modifying the spacers (or shims) to suit various operational requirements.

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Description
Specifications
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Structural Composition
·Open Type: Comprises three outer rings (cups), two inner rings (cones), four rows of rollers, two outer spacers, and one inner spacer.
·Sealed Type: Adds two sealing rings to the basic structure of the open type.

Key Features
·High Load-Carrying Capacity: The four-row roller arrangement is designed to withstand significantly greater radial loads compared to double-row bearings.
·Extended Service Life: Optimizing the surface finish of the roller and raceway contact surfaces promotes the formation of a hydrostatic/hydrodynamic lubricant film, which enhances wear resistance.
·Easy Installation: Typically designed with a loose fit for simplified installation and removal.
·Adjustable Clearance: The bearing's internal clearance is either pre-adjusted or can be set precisely through the use of adjusting spacers, which ensures rotational accuracy and prolongs service life.
·High Reliability: Optimized sealing designs effectively prevent external contamination while simultaneously reducing friction and heat generation.

Primary Applications
·Rolling Mills: Work rolls in four-high hot rolling mills and cold rolling mills, etc.
·Blooming Mills: Used in the steel industry for blooming and slabbing operations.
·Heavy Machinery: Such as mining equipment.

Basic dimensions				Basic load rating		Speed ratings		Mass	Model
Basic dimensions				Dynamic	Static	Reference speed	Limiting speed	Mass	Bearing No.
d [mm]	D [mm]	B [mm]	T [mm]	C [kN]	C0 [kN]	[r/min]	[r/min]	[kg]	Bearing No.
139.7	200.025	157.162	160.34	160.34					331138 AG Bearing
177.8	247.65	192.088	192.088	192.088					331480 G Bearing
177.8	247.65	192.088	192.088	192.088					BT4-0010 G/HA1C400VA903 Bearing
198.438	284.162	225.425	225.425	225.425					BT4-0027 AG/HA1 Bearing
206.375	282.575	190.5	190.5	190.5					BT4-0013 G/HA1C400VA903 Bearing
206.375	282.575	190.5	190.5	190.5					BT4-0021 G/HA1 Bearing
220	295	315	315	315					BT4-0035 E8/C355 Bearing
220.662	314.325	239.712	239.712	239.712					BT4-0040 E8/C355 Bearing
240	338	248	248	248					BT4-0020/HA1 Bearing
241.478	349.148	228.6	228.6	228.6					330782 AG Bearing
244.475	327.025	193.675	193.675	193.675					330862 B Bearing
254	358.775	268.875	268.875	268.875					BT4-0039 E8/C355 Bearing
266.7	355.6	230.188	228.6	228.6					BT4-0014 G/HA1C400VA903 Bearing
266.7	355.6	230.188	228.6	228.6					BT4B 328209 G/HA1C455 Bearing
269.875	381	282.575	282.575	282.575					BT4B 331168 B Bearing
276.225	393.7	269.875	269.875	269.875					BT4-0012 G/HA1C500VA901 Bearing
279.4	393.7	269.875	269.875	269.875					BT4-0011 G/HA1C500VA901 Bearing
279.578	380.898	244.475	244.475	244.475					330540 AG Bearing
280	406.4	298.45	298.45	298.45					BT4-0026 A/PEX Bearing
285.75	380.898	244.475	244.475	244.475					330337 AG Bearing
285.75	380.898	244.475	244.475	244.475					BT4-0015 G/HA1C400VA903 Bearing
288.925	406.4	298.45	292.45	292.45					BT4B 331452 G/HA1 Bearing
292.1	422.275	269.875	269.875	269.875					BT4B 331968 BG/HA1 Bearing
304.648	438.048	280.99	279.4	279.4					331492 Bearing
304.8	501.65	336.55	336.55	336.55					BT4B 328909 G/HA1VA901 Bearing
304.902	412.648	266.7	266.7	266.7					330758 BG Bearing
304.902	412.648	266.7	266.7	266.7					BT4-0004 G/HA1 Bearing
310	430	310	310	310					BT4-8093 G/HA1VA901 Bearing
317.5	422.275	269.875	269.875	269.875					330870 BG Bearing
317.5	447.675	327.025	327.025	327.025					BT4B 331161 AG/HA4 Bearing

Basic dimensions				Basic load rating		Speed ratings		Mass	Model
Basic dimensions				dynamic	static	Reference speed	Limiting speed	Mass	Bearing No.
d [mm]	D [mm]	B [mm]	T [mm]	C [kN]	C0 [kN]	[r/min]	[r/min]	[kg]	Bearing No.
317.5	447.675	327.025	327.025	327.025					BT4B 331161 BG/HA1 Bearing
317.5	422.275	269.875	269.875	269.875					BT4B 334023 E1/C675 Bearing
330.2	444.5	301.625	301.625	301.625					BT4B 332647 G/HA1 Bearing
330.302	438.023	247.65	254	254					BT4-8113 E2/C500 Bearing
333.375	469.9	342.9	342.9	342.9					331381 Bearing
343.052	457.098	254	254	254					BT4-8160 E8/C475 Bearing
343.052	457.098	254	254	254					BT4-8160 E81/C400 Bearing
343.052	457.098	254	254	254					BT4-8160 E81/C475 Bearing
343.052	457.098	254	254	254					BT4B 328817 E1/C475 Bearing
343.052	457.098	254	254	254					BT4B 328817 EX1/C475 Bearing
346.075	488.95	358.775	358.775	358.775					BT4B 331228 G/HA1C200 Bearing
347.662	469.9	292.1	292.1	292.1					331092 A Bearing
347.662	469.9	292.1	292.1	292.1					BT4-8070 G/HA1VA901 Bearing
355.6	488.95	317.5	317.5	317.5					331271 Bearing
355.6	482.6	265.113	269.875	269.875					BT4-8162 E8/C480 Bearing
355.6	482.6	265.113	269.875	269.875					BT4-8162 E81/C480 Bearing
355.6	482.6	265.113	269.875	269.875					BT4B 328870 EX1/C300 Bearing
355.6	488.95	317.5	317.5	317.5					BT4B 328912 E1/C300 Bearing
355.6	488.95	317.5	317.5	317.5					BT4B 328912 E3/C675 Bearing
360	510	380	380	380					332059 Bearing
368.3	523.875	382.588	382.588	382.588					331159 A Bearing
380	560	390	360	360					BT4-8033 G/HA1 Bearing
380	540	300	300	300					BT4-8086 G/HA1 Bearing
384.175	546.1	400.05	400.05	400.05					331149 E/C675 Bearing
384.175	546.1	400.05	400.05	400.05					BT4-8025 G/HA1C300VA903 Bearing
384.175	546.1	400.05	400.05	400.05					BT4B 334128/HA1 Bearing
385.762	514.35	317.5	317.5	317.5					BT4B 334042 E1/C575 Bearing
395	545	268	288.9	288.9					BT4B 332824 E/C475 Bearing
395	545	268	288.9	288.9					BT4B 332824/HA1 Bearing
400	600	308	308	308					BT4-8147 G/HA1 Bearing

Basic dimensions				Basic load rating		Speed ratings		Mass	Model
Basic dimensions				dynamic	static	Reference speed	Limiting speed	Mass	Bearing No.
d [mm]	D [mm]	B [mm]	T [mm]	C [kN]	C0 [kN]	[r/min]	[r/min]	[kg]	Bearing No.
406.4	562	381	381	381					BT4-8126 E1/C575 Bearing
406.4	546.1	288.925	288.925	288.925					BT4-8161 E8/C500 Bearing
406.4	546.1	288.925	288.925	288.925					BT4-8161 E81/C500 Bearing
406.4	546.1	288.925	288.925	288.925					BT4B 328838 BG/HA1VA902 Bearing
406.4	565.15	381	381	381					BT4B 331347 AG/HA1 Bearing
406.4	546.1	330	330	330					BT4B 334093 BG/HA1VA902 Bearing
409.575	546.1	334.962	334.962	334.962					BT4B 329004 G/HA1VA901 Bearing
409.575	546.151	334.962	334.962	334.962					BT4B 331333 E/C350 Bearing
409.575	546.1	334.962	334.962	334.962					BT4B 331333 E/C575 Bearing
431.8	571.5	400	400	400					BT4-8067 G/HA1VA902 Bearing
431.8	571.5	336.55	336.55	336.55					BT4B 331226 AG/HA1 Bearing
431.8	571.5	336.55	336.55	336.55					BT4B 331226 BG/HA1 Bearing
431.8	571.5	336.55	336.55	336.55					BT4B 331226/HA1 Bearing
431.8	635	440	355.6	355.6					BT4B 334019 G/HA1 Bearing
440	650	353.5	353.5	353.5					332313 Bearing
440	580	360	360	360					BT4-8124 E/C550 Bearing
440	650	353.5	353.5	353.5					BT4B 328944 G/HA1VA901 Bearing
440	590	480	480	480					BT4B 334055 ABG/HA1VA902 Bearing
447.675	635	463.55	463.55	463.55					330608 C Bearing
450	595	404	404	404					BT4-8044 G/HA1VA902 Bearing
450	595	368	368	368					BT4-8173 E8/C725 Bearing
450	595	368	368	368					BT4-8173 E81/C725 Bearing
450	595	404	404	404					BT4B 328365 EX/C725 Bearing
450	595	368	368	368					BT4B 332773 E/C725 Bearing
457.2	596.9	276.225	279.4	279.4					331169 BG Bearing
457.2	596.9	276.225	279.4	279.4					331169 E/C500 Bearing
457.2	606	381	381	381					BT4-8125 E1/C725 Bearing
457.2	596.9	276.225	279.4	279.4					BT4B 328827 ABG/HA1VA902 Bearing
460	610	360	360	360					BT4-8111 E2/C725 Bearing
460	610	360	360	360					BT4B 331977 E/C725 Bearing

Basic dimensions				Basic load rating		Speed ratings		Mass	Model
Basic dimensions				dynamic	static	Reference speed	Limiting speed	Mass	Bearing No.
d [mm]	D [mm]	B [mm]	T [mm]	C [kN]	C0 [kN]	[r/min]	[r/min]	[kg]	Bearing No.
460	625	421	421	421					BT4B 332502/HA1 Bearing
475	600	368	368	368					BT4B 328913 BG/HA1C555 Bearing
479.425	679.45	495.3	495.3	495.3					330886 B Bearing
482.6	615.95	330.2	330.2	330.2					332096 E/C725 Bearing
482.6	615.95	330.2	330.2	330.2					BT4-8163 E8/C725 Bearing
482.6	615.95	330.2	330.2	330.2					BT4-8163 E81/C725 Bearing
482.6	615.95	330.2	330.2	330.2					BT4-8163 E8A/C725 Bearing
482.6	615.95	330.2	330.2	330.2					BT4B 328842 E1/C325 Bearing
482.6	647.7	417.512	417.512	417.512					BT4B 331259 BG/HA1C325 Bearing
489.026	634.873	320.675	320.675	320.675					331090 E/C700 Bearing
490	625	385	385	385					BT4-8135 E/C750 Bearing
500	670	400.05	387.35	387.35					BT4-8056 G/HA1 Bearing
501.65	711.2	520.7	520.7	520.7					331081 A Bearing
510	655	377	379	379					BT4-8167 E8/C775 Bearing
510	655	377	379	379					BT4-8167 E81/C775 Bearing
520.7	736.6	400.05	400.05	400.05					BT4B 331243 A/HA1 Bearing
530	680	440	440	440					BT4-8043 G/HA1 Bearing
540	690	400	400	400					331978 BG Bearing
540	690	400	400	400					BT4-8108 E/C625 Bearing
558.8	736.6	322.265	322.268	322.268					331165 A Bearing
558.8	736.6	322.265	322.268	322.268					331165 AG Bearing
558.8	736.6	455.612	457.2	457.2					BT4-8022 G/HA1VA919 Bearing
558.8	736.6	409.575	409.575	409.575					BT4B 330993 AG/HA1 Bearing
558.8	736.6	409.575	409.575	409.575					BT4B 334080 G/HA1VA901 Bearing
560	700	405	405	405					BT4-8153 E/C775 Bearing
560	920	618	618	618					BT4B 328509/HA4 Bearing
571.5	812.8	593.725	593.725	593.725					BT4B 332666/HA1 Bearing
584.2	762	396.875	401.638	401.638					331148 A Bearing
584.2	730.25	342.9	349.25	349.25					BT4B 331189 E/C600 Bearing
585.788	771.525	479.425	479.425	479.425					BT4B 328888 BG/HA1VA901 Bearing

Basic dimensions				Basic load rating		Speed ratings		Mass	Model
Basic dimensions				dynamic	static	Reference speed	Limiting speed	Mass	Bearing No.
d [mm]	D [mm]	B [mm]	T [mm]	C [kN]	C0 [kN]	[r/min]	[r/min]	[kg]	Bearing No.
585.788	771.525	479.425	479.425	479.425					BT4B 331093 BG/HA1 Bearing
595.312	844.55	615.95	615.95	615.95					BT4B 331300 E/C775 Bearing
603.25	857.25	622.3	622.3	622.3					331625 Bearing
603.25	857.25	622.3	622.3	622.3					BT4B 331625 E/C800 Bearing
609.6	787.4	361.95	361.95	361.95					331175 A Bearing
609.6	787.4	361.95	361.95	361.95					331175 BG/C355 Bearing
609.6	813.562	479.425	479.425	479.425					331925 Bearing
609.6	787.4	361.95	361.95	361.95					BT4B 328871 G/HA1VA901 Bearing
620	800	363.5	363.5	363.5					BT4B 328510/HA1 Bearing
625	815	480	480	480					BT4-8031 E/C800 Bearing
625	815	600	600	600					BT4-8137 G/HA1 Bearing
650	1030	560	560	560					BT4B 332827 AG/HA1 Bearing
660	1070	648.002	648.002	648.002					BT4B 332833 G/HA4 Bearing
660.4	812.8	365.125	365.125	365.125					331190 Bearing
660.4	812.8	365.125	365.125	365.125					BT4B 331190 BG/HA1 Bearing
676	910	620	620	620					BT4B 332906/HA4 Bearing
679.45	901.7	552.45	552.45	552.45					BT4B 334015 BG/HA1VA901 Bearing
679.45	901.7	635	542.45	542.45					BT4B 334016 AG/HA1VA901 Bearing
680	930	700	700	700					BT4B 328349/HA1 Bearing
685.8	876.3	352.425	355.6	355.6					BT4B 328955 ABG/HA1VA902 Bearing
685.8	876	352.425	355.6	355.6					BT4B 331089 CG/HA1 Bearing
708.025	930.275	565.15	565.15	565.15					BT4-8109 E1/C800 Bearing
708.025	930.275	565.15	565.15	565.15					BT4B 332098 A/HA4 Bearing
710	900	410	410	410					331351 Bearing
710	900	410	410	410					BT4B 331351 BG/HA1 Bearing
710	900	410	410	410					BT4B 331351 E/C775 Bearing
711.2	914.4	390	390	390					BT4-8139 G/HA1 Bearing
717.55	946.15	565.15	565.15	565.15					332244 Bearing
717.55	946.15	565.15	565.15	565.15					BT4-8069 G/HA1VA901 Bearing
730.25	1035.05	755.65	755.65	755.65					330803 A Bearing

Basic dimensions				Basic load rating		Speed ratings		Mass	Model
Basic dimensions				dynamic	static	Reference speed	Limiting speed	Mass	Bearing No.
d [mm]	D [mm]	B [mm]	T [mm]	C [kN]	C0 [kN]	[r/min]	[r/min]	[kg]	Bearing No.
750	950	410	410	410					BT4-8048 E/C725 Bearing
750	1130	690	690	690					BT4B 328376/HA4 Bearing
785	1010	600	600	600					BT4-8121 E/C600 Bearing
825.5	1168.4	844.55	844.55	844.55					BT4B 331066 A/HA4 Bearing
863.6	1219.1	876.3	889	889					BT4B 330742 A/HA4 Bearing
863.6	1130.3	669.925	669.925	669.925					BT4B 331123 DG/HA1 Bearing
877.888	1220	844.55	844.55	844.55					BT4B 332981/HA4 Bearing
938.212	1270	825.5	825.5	825.5					330726 A Bearing
1001	1360	800	800	800					BT4B 334031 AG/HA4 Bearing
1001	1360	800	800	800					BT4B 334031/HA4C1800 Bearing
1070.001	1399.997	889.762	889.762	889.762					BT4B 328100/HA4 Bearing
1300	1720	840	840	840					BT4-8150 G/HA4 Bearing
287.5	440	330.3	284	284					BT4B 332997 B/HA1 Bearing
287.5	440	330.3	284	284					BT4B 332997/HA1 Bearing
368.294	523.875	411.162	366.712	366.712					BT4B 334056 B/HA1 Bearing
384.175	546.1	437.96	384.175	384.175					BT4B 334048/HA1 Bearing
391.071	550	428.625	384.175	384.175					BT4B 328305/HA1 Bearing
400	540	330	295	295					332297 Bearing
400	540	295	330	330					BT4-8050/HA1 Bearing
406.445	565.201	409.575	365.125	365.125					BT4B 332813 B/HA1C425 Bearing
415.925	590.55	479.96	419.1	419.1					BT4B 334047/HA1 Bearing
431.8	571.5	366.713	320.675	320.675					331999 Bearing
450	595	388	352	352					BT4-8053/HA1 Bearing
482.6	647.7	436.5	401.638	401.638					BT4-8052/HA1 Bearing
555.233	761.873	692.15	536.575	536.575					BT4B 334125/HA1 Bearing
770	1040	800	650	650					BT4B 334099/HA4 Bearing
872.769	1181.1	714.375	628.65	628.65					BT4B 332786/HA4 Bearing
872.847	1181.1	714.375	628.65	628.65					BT4B 328956/HA4 Bearing

Engineering the Future of Motion

About UKL

Founded in 2020, UKL Bearing Manufacturing Co., Ltd. (Wuxi) is China 331138 AG Four-Row Tapered Roller Bearing suppliers and OEM/ODM 331138 AG Four-Row Tapered Roller Bearing company, an integrated industrial and trading enterprise that focuses on precision manufacturing, combining R&D, production, and sales.
The company specializes in high-performance bearing solutions, providing technical support for global industries with exceptionally high demands for precision and reliability.

With more than 200 skilled professionals and a fully modernized production base, UKL’s facilities cover the entire manufacturing process — forging, annealing, turning, heat treatment, grinding, and automated assembly.
Leveraging over 15 years of OEM/ODM export experience, UKL responds quickly to customer needs, offering flexible and customized services for clients across Europe, Asia, Africa, and the Middle East.

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331138 AG Four-Row Tapered Roller Bearing

331138 AG Four-Row Tapered Roller Bearing

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