Single Direction Thrust Ball Bearings

BMT Bearings supplies high-precision Single Direction Thrust Ball Bearings designed for applications requiring stable axial load support in one direction. These bearings are widely used in electric motors, pumps, automotive systems, industrial machinery, and automation equipment. With strong manufacturing capability and consistent export experience, BMT Bearings delivers stable quality, low noise performance, and long service life for global OEM and distributor customers.

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Product Description

BMT Bearings has been manufacturing precision bearings since 2004. With continuous investment in production automation and quality systems, our annual output has exceeded 100 million pieces.

Over the years, we have developed strong application experience across multiple industries, including:

Electric motors
Pumps and fluid systems
Agricultural machinery
Automotive components
Industrial automation equipment

Our focus is not only production, but also helping customers achieve:

Lower maintenance cost
Higher operational stability
Longer equipment service life

What Are Single Direction Thrust Ball Bearings?

Single Direction Thrust Ball Bearings are designed to carry axial loads in one direction only. They consist of:

Shaft washer
Housing washer
Ball and cage assembly

These bearings are not suitable for radial loads, but they provide excellent performance in systems requiring precise axial positioning and smooth rotation.

BMT Bearings produces these bearings using high-grade steel, precision grinding, and controlled heat treatment to ensure stable performance under continuous operation.

Single Direction Thrust Ball Bearings

Technical Parameters

Single direction Thrust Ball Bearings
Related bearing models		Dimensions(mm)												Basic load ratings
Code bearing	Seating washer	d	D	T	D1	d1	r min.	R	A	D2	D3	C	T1	dyn. Ca KN	stat. Coa KN
51100	–	10	24	9	11	24	0.3	–	–	–	–	–	–	10	14
51200	–	10	26	11	12	26	0.6	–	–	–	–	–	–	12.7	17
53200	–	10	26	11.6	12	26	0.6	22	8.5	–	–	–	–	12.7	17
53200	U200	10	26	11.6	12	26	0.6	22	8.5	18	28	3.5	13	12.7	17
51101	–	12	26	9	13	26	0.3	–	–	–	–	–	–	10.4	15.3
51201	–	12	28	11	14	28	0.6	–	–	–	–	–	–	13.2	19
53201	–	12	28	11.4	14	28	0.6	25	11.5	–	–	–	–	13.2	19
53201	U201	12	28	11.4	14	28	0.6	25	11.5	20	30	3.5	13	13.2	19
51102	–	15	28	9	16	28	0.3	–	–	–	–	–	–	10.6	16.6
51202	–	15	32	12	17	32	0.6	–	–	–	–	–	–	16.6	25
53202	–	15	32	13.3	17	32	0.6	28	12	–	–	–	–	16.6	25
53202	U202	15	32	13.3	17	32	0.6	28	12	24	35	4	15	16.6	25
51103	–	17	30	9	18	30	0.3	–	–	–	–	–	–	11.4	19.6
51203	–	17	35	12	19	35	0.6	–	–	–	–	–	–	17.3	27.5
53203	–	17	35	13.2	19	35	0.6	32	16	–	–	–	–	17.3	27.5
53203	U203	17	35	13.2	19	35	0.6	32	16	26	38	4	15	17.3	27.5
51104	–	20	35	10	21	35	0.3	–	–	–	–	–	–	15	26.5
51204	–	20	40	14	22	40	0.6	–	–	–	–	–	–	22.4	37.5
53204	–	20	40	14.7	22	40	0.6	36	18	–	–	–	–	22.4	37.5
53204	U204	20	40	14.7	22	40	0.6	36	18	30	42	5	17	22.4	37.5
51105	–	25	42	11	26	42	0.6	–	–	–	–	–	–	18	35.5
51205	–	25	47	15	27	47	0.6	–	–	–	–	–	–	28	50
53205	–	25	47	16.7	27	47	0.6	40	19	–	–	–	–	28	50
53205	U205	25	47	16.7	27	47	0.6	40	19	36	50	5.5	19	28	50
51305	–	25	52	18	27	52	1	–	–	–	–	–	–	34.5	55
53305	–	25	52	19.8	27	52	1	45	21	–	–	–	–	34.5	55
53305	U305	25	52	19.8	27	52	1	45	21	38	55	6	22	34.5	55
51405	–	25	60	24	27	60	1	–	–	–	–	–	–	45.5	67
51106	–	30	47	11	32	47	0.6	–	–	–	–	–	–	19	40
51206	–	30	52	16	32	52	0.6	–	–	–	–	–	–	25	46.5
53206	–	30	52	17.8	32	52	0.6	45	22	–	–	–	–	25	46.5
53206	U206	30	52	17.8	32	52	0.6	45	22	42	55	5.5	20	25	46.5
51306	–	30	60	21	32	60	1	–	–	–	–	–	–	38	65.5
53306	–	30	60	22.6	32	60	1	50	22	–	–	–	–	38	65.5
53306	U306	30	60	22.6	32	60	1	50	22	45	62	7	25	38	65.5
51406	–	30	70	28	32	70	1	–	–	–	–	–	–	69.5	112
51107	–	35	52	12	37	52	0.6	–	–	–	–	–	–	20	46.5
51207	–	35	62	18	37	62	1	–	–	–	–	–	–	35.5	67
53207	–	35	62	19.9	37	62	1	50	24	–	–	–	–	35.5	67
53207	U207	35	62	19.9	37	62	1	50	24	48	65	7	22	35.5	67
51307	–	35	68	24	37	68	1	–	–	–	–	–	–	50	88
53307	–	35	68	25.6	37	68	1	56	24	–	–	–	–	50	88
53307	U307	35	68	25.6	37	68	1	56	24	52	72	7.5	28	50	88
51407	–	35	80	32	37	80	1.1	–	–	–	–	–	–	76.5	127
51108	–	40	60	13	42	60	0.6	–	–	–	–	–	–	27	63
51208	–	40	68	19	42	68	1	–	–	–	–	–	–	46.5	98
53208	–	40	68	20.3	42	68	1	56	28.5	–	–	–	–	46.5	98
53208	U208	40	68	20.3	42	68	1	56	28.5	55	72	7	23	46.5	98
51308	–	40	78	26	42	78	1	–	–	–	–	–	–	61	112
53308	–	40	78	28.5	42	78	1	64	28	–	–	–	–	61	112
53308	U308	40	78	28.5	42	78	1	64	28	60	82	8.5	31	61	112
51408	–	40	90	36	42	90	1.1	–	–	–	–	–	–	96.5	170
51109	–	45	65	14	47	65	0.6	–	–	–	–	–	–	28	69.5
51209	–	45	73	20	47	73	1	–	–	–	–	–	–	39	80
53209	–	45	73	21.3	47	73	1	56	26	–	–	–	–	39	80
53209	U209	45	73	21.3	47	73	1	56	26	60	78	7.5	24	39	80
51309	–	45	85	28	47	85	1	–	–	–	–	–	–	75	140
53309	–	45	85	30.1	47	85	1	64	25	–	–	–	–	75	140
53309	U309	45	85	30.1	47	85	1	64	25	65	90	10	33	75	140
51409	–	45	100	39	47	100	1.1	–	–	–	–	–	–	122	220
51110	–	50	70	14	52	70	0.6	–	–	–	–	–	–	29	75
51210	–	50	78	22	52	78	1	–	–	–	–	–	–	50	106
53210	–	50	78	23.5	52	78	1	64	32.5	–	–	–	–	50	106
53210	U210	50	78	23.5	52	78	1	64	32.5	62	82	7.5	26	50	106
51310	–	50	95	31	52	95	1.1	–	–	–	–	–	–	86.5	170
53310	–	50	95	34.3	52	95	1.1	72	28	–	–	–	–	86.5	170
53310	U310	50	95	34.3	52	95	1.1	72	28	72	100	11	37	86.5	170
51410	–	50	110	43	52	110	1.5	–	–	–	–	–	–	137	255
51111	–	55	78	16	57	78	0.6	–	–	–	–	–	–	30.5	75
51211	–	55	90	25	57	90	1	–	–	–	–	–	–	61	134
53211	–	55	90	27.3	57	90	1	72	35	–	–	–	–	61	134
53211	U211	55	90	27.3	57	90	1	72	35	72	95	9	30	61	134
51311	–	55	105	35	57	105	1.1	–	–	–	–	–	–	102	208
53311	–	55	105	39.3	57	105	1.1	80	30	–	–	–	–	102	208
53311	U311	55	105	39.3	57	105	1.1	80	30	80	110	11.5	42	102	208
51411	–	55	120	48	57	120	1.5	–	–	–	–	–	–	180	360
51112	–	60	85	17	62	85	1	–	–	–	–	–	–	39.4	106.4
51212	–	60	95	26	62	95	1	–	–	–	–	–	–	58.9	133
53212	–	60	95	28	62	95	1	72	32.5	–	–	–	–	58.9	133
53212	U212	60	95	28	62	95	1	72	32.5	78	100	9	31	58.9	133
51312	–	60	110	35	62	110	1.1	–	–	–	–	–	–	95	197.6
53312	–	60	110	38.3	62	110	1.1	90	41	–	–	–	–	95	197.6
53312	U312	60	110	38.3	62	110	1.1	90	41	85	115	11.5	42	95	197.6
51412	–	60	130	51	62	130	1.5	–	–	–	–	–	–	190	380
51113	–	65	90	18	67	90	1	–	–	–	–	–	–	36.1	95
51213	–	65	100	27	67	100	1	–	–	–	–	–	–	60.8	142.5
53213	–	65	100	28.7	67	100	1	80	40	–	–	–	–	60.8	142.5
53213	U213	65	100	28.7	67	100	1	80	40	82	105	9	32	60.8	142.5
51313	–	65	115	36	67	115	1.1	–	–	–	–	–	–	100.7	209
53313	–	65	115	39.4	67	115	1.1	90	38.5	–	–	–	–	100.7	209
53313	U313	65	115	39.4	67	115	1.1	90	38.5	90	120	12.5	43	100.7	209
51413	–	65	140	56	68	140	2	–	–	–	–	–	–	205.2	427.5
51114	–	70	95	18	72	95	1	–	–	–	–	–	–	38	104.5
51214	–	70	105	27	72	105	1	–	–	–	–	–	–	62.2	152
53214	–	70	105	28.8	72	105	1	80	38	–	–	–	–	62.2	152
53214	U214	70	105	28.8	72	105	1	80	38	88	110	9	32	62.2	152
51314	–	70	125	40	72	125	1.1	–	–	–	–	–	–	127.3	275.5
53314	–	70	125	44.2	72	125	1.1	100	43	–	–	–	–	127.3	275.5
53314	U314	70	125	44.2	72	125	1.1	100	43	98	130	13	48	127.3	275.5
51414	–	70	150	60	73	150	2	–	–	–	–	–	–	224.2	475
51115	–	75	100	19	77	100	1	–	–	–	–	–	–	41.8	115.9
51215	–	75	110	27	77	110	1	–	–	–	–	–	–	63.7	161.5
53215	–	75	110	28.3	77	110	1	90	49	–	–	–	–	63.7	161.5
53215	U215	75	110	28.3	77	110	1	90	49	92	115	9.5	32	63.7	161.5
51315	–	75	135	44	77	135	1.5	–	–	–	–	–	–	154.9	342
53315	–	75	135	48.1	77	135	1.5	100	37	–	–	–	–	154.9	342
53315	U315	75	135	48.1	77	135	1.5	100	37	105	140	15	52	154.9	342
51415	–	75	160	65	78	160	2	–	–	–	–	–	–	237.5	532
51116	–	80	105	19	82	105	1	–	–	–	–	–	–	42.8	122.6
51216	–	80	115	28	82	115	1	–	–	–	–	–	–	71.3	180.5
53216	–	80	115	29.5	82	115	1	90	46	–	–	–	–	71.3	180.5
53216	U216	80	115	29.5	82	115	1	90	46	98	120	10	33	71.3	180.5
51316	–	80	140	44	82	140	1.5	–	–	–	–	–	–	152	342
53316	–	80	140	47.6	82	140	1.5	112	50	–	–	–	–	152	342
53316	U316	80	140	47.6	82	140	1.5	112	50	110	145	15	52	152	342
51416	–	80	170	68	83	170	2.1	–	–	–	–	–	–	256.5	589
51117	–	85	110	19	87	110	1	–	–	–	–	–	–	43.2	127.3
51217	–	85	125	31	88	125	1	–	–	–	–	–	–	93.1	237.5
53217	–	85	125	33.1	88	125	1	100	52	–	–	–	–	93.1	237.5
53217	U217	85	125	33.1	88	125	1	100	52	105	130	11	37	93.1	237.5
51317	–	85	150	49	88	150	1.5	–	–	–	–	–	–	176.7	394.3
53317	–	85	150	53.1	88	150	1.5	112	43	–	–	–	–	176.7	394.3
53317	U317	85	150	53.1	88	150	1.5	112	43	115	155	17.5	58	176.7	394.3
51417	–	85	180	72	88	177	2.1	–	–	–	–	–	–	275.5	646
51118	–	90	120	22	92	120	1	–	–	–	–	–	–	43.2	133
51218	–	90	135	35	93	135	1.1	–	–	–	–	–	–	112.1	285
53218	–	90	135	38.5	93	135	1.1	100	45	–	–	–	–	112.1	285
53218	U218	90	135	38.5	93	135	1.1	100	45	110	140	13.5	42	112.1	285
51318	–	90	155	50	93	155	1.5	–	–	–	–	–	–	183.4	432.3
53318	–	90	155	54.6	93	155	1.5	112	40	–	–	–	–	183.4	432.3
53318	U318	90	155	54.6	93	155	1.5	112	40	120	160	18	59	183.4	432.3
51418	–	90	190	77	93	187	2.1	–	–	–	–	–	–	289.8	712.5
51120	–	100	135	25	102	135	1	–	–	–	–	–	–	76.5	243
51220	–	100	150	38	103	150	1.1	–	–	–	–	–	–	114.3	292.5
53220	–	100	150	40.9	103	150	1.1	112	52	–	–	–	–	109.8	288
53220	U220	100	150	40.9	103	150	1.1	112	52	125	155	14	45	109.8	288
51320	–	100	170	55	103	170	1.5	–	–	–	–	–	–	216	526.5
53320	–	100	170	59.2	103	170	1.5	125	46	–	–	–	–	216	526.5
53320	U320	100	170	59.2	103	170	1.5	125	46	135	175	18	64	216	526.5
51420	–	100	210	85	103	205	3	–	–	–	–	–	–	328.5	868.5
51122	–	110	145	25	112	145	1	–	–	–	–	–	–	77.9	261
51222	–	110	160	38	113	160	1.1	–	–	–	–	–	–	120.6	328.5
53222	–	110	160	40.2	113	160	1.1	125	65	–	–	–	–	120.6	328.5
53222	U222	110	160	40.2	113	160	1.1	125	65	135	165	14	45	120.6	328.5
51322	–	110	190	63	113	187	2	–	–	–	–	–	–	252	675
53322	–	110	190	67.2	113	187	2	140	51	–	–	–	–	252	675
53322	U322	110	190	67.2	113	187	2	140	51	150	195	20.5	72	252	675
51422	–	110	230	95	113	225	3	–	–	–	–	–	–	373.5	1026
51124	–	120	155	25	122	155	1	–	–	–	–	–	–	81	279
51224	–	120	170	39	123	170	1.1	–	–	–	–	–	–	120.6	351
53224	–	120	170	40.8	123	170	1.1	125	61	–	–	–	–	120.6	351
53224	U224	120	170	40.8	123	170	1.1	125	61	145	175	15	46	120.6	351
51324	–	120	210	70	123	205	2.1	–	–	–	–	–	–	292.5	823.5
53324	–	120	210	74.1	123	205	2.1	160	63	–	–	–	–	292.5	823.5
53324	U324	120	210	74.1	123	205	2.1	160	63	165	220	22	80	292.5	823.5
51424	–	120	250	102	123	245	4	–	–	–	–	–	–	382.5	1098
51126	–	130	170	30	132	170	1	–	–	–	-	-	-	100.8	351
51226	–	130	190	45	133	187	1.5	–	–	–	-	-	-	164.7	486
53226	–	130	190	47.9	133	187	1.5	140	67	–	-	-	-	164.7	486
53226	U226	130	190	47.9	133	187	1.5	140	67	160	195	17	53	164.7	486
51326	–	130	225	75	134	220	2.1	–	–	–	-	-	-	324	954
51128	–	140	180	31	142	178	1	–	–	–	-	-	-	100.8	360
51228	–	140	200	46	143	197	1.5	–	–	–	-	-	-	171	513
53228	–	140	200	48.6	143	197	1.5	160	87	–	-	-	-	171	513
53228	U228	140	200	48.6	143	197	1.5	160	87	170	210	17	55	171	513
51328	–	140	240	80	144	235	2.1	–	–	–	-	-	-	364.5	1125
51130	–	150	190	31	152	188	1	–	–	–	-	-	-	99	360
51230	–	150	215	50	153	212	1.5	–	–	–	-	-	-	212.4	661.5
53230	–	150	215	53.3	153	212	1.5	160	79	–	-	-	-	212.4	661.5
53230	U230	150	215	53.3	153	212	1.5	160	79	180	225	20.5	60	212.4	661.5
51330	–	150	250	80	154	245	2.1	–	–	–	-	-	-	373.5	1206
53330	–	150	250	83.7	154	245	2.1	200	89.5	–	-	-	-	373.5	1206
53330	U330	150	250	83.7	154	245	2.1	200	89.5	200	260	26	92	373.5	1206
51132	–	160	200	31	162	198	1	–	–	–	-	-	-	100.8	387
51232	–	160	225	51	163	222	1.5	–	–	–	-	-	-	216	688.5
53232	–	160	225	54.7	163	222	1.5	160	74	–	-	-	-	216	688.5
53232	U232	160	225	54.7	163	222	1.5	160	74	190	235	21	61	216	688.5
51332	–	160	270	87	164	265	3	–	–	–	-	-	-	418.5	1404
51134	–	170	215	34	172	213	1.1	–	–	–	-	-	-	118.8	450
51234	–	170	240	55	173	237	1.5	–	–	–	-	-	-	256.5	837
53234	–	170	240	58.7	173	237	1.5	180	91	–	-	-	-	256.5	837
53234	U234	170	240	58.7	173	237	1.5	180	91	200	250	21.5	65	256.5	837
51334	–	170	280	87	174	275	3	–	–	–	-	-	-	418.5	1404
51136	–	180	225	34	183	222	1.1	–	–	–	–	–	–	120.6	477
51236	–	180	250	56	183	245	1.5	–	–	–	–	–	–	274.5	936
53236	–	180	250	58.2	183	245	1.5	200	112	–	–	–	–	274.5	936
53236	U236	180	250	58.2	183	245	1.5	200	112	210	260	21.5	66	274.5	936
51336	–	180	300	95	184	295	3	–	–	–	–	–	–	468	1647
51138	–	190	240	37	193	237	1.1	–	–	–	–	–	–	153	589.5
51238	–	190	270	62	194	265	2	–	–	–	–	–	–	301.5	1044
53238	–	190	270	65.7	195	265	2	200	98	–	–	–	–	301.5	1044
53238	U238	190	270	65.7	195	265	2	200	98	230	280	23	73	301.5	1044
51338	–	190	320	105	195	315	4	–	–	–	–	–	–	540	1980
51140	–	200	250	37	203	247	1.1	–	–	–	–	–	–	153	589.5
51240	–	200	280	62	204	275	2	–	–	–	–	–	–	306	1098
51340	–	200	340	110	205	335	4	–	–	–	–	–	–	558	2160
51144	–	220	270	37	223	267	1.1	–	–	–	–	–	–	158.4	661.5
51244	–	220	300	63	224	295	2	–	–	–	–	–	–	319.5	1206
51148	–	240	300	45	243	297	1.5	–	–	–	–	–	–	208.8	868.5
51248	–	240	340	78	244	335	2.1	–	–	–	–	–	–	418.5	1674
51152	–	260	320	45	263	317	1.5	–	–	–	–	–	–	212.4	918
51252	–	260	360	79	264	355	2.1	–	–	–	–	–	–	441	1836
51156	–	280	350	53	283	347	1.5	–	–	–	–	–	–	283.5	1206
51256	–	280	380	80	284	375	2.1	–	–	–	–	–	–	441	1944
51160	–	300	380	62	304	376	2	–	–	–	–	–	–	328.5	1440
51260	–	300	420	95	304	415	3	–	–	–	–	–	–	526.5	2430
51164	–	320	400	63	324	396	2	–	–	–	–	–	–	337.5	1530
51264	–	320	440	95	325	435	3	–	–	–	–	–	–	540	2520
51168	–	340	420	64	344	416	2	–	–	–	–	–	–	342	1620
51268	–	340	460	96	345	455	3	–	–	–	–	–	–	558	2745
51172	–	360	440	65	364	436	2	–	–	–	–	–	–	364.5	1800
51272	–	360	500	110	365	495	4	–	–	–	–	–	–	648	3285
51176	–	380	460	65	384	456	2	–	–	–	-	-	-	387	2016
51180	-	400	480	65	404	476	2	–	–	–	-	-	-	396	2088
51184	-	420	500	65	424	495	2	–	–	-	-	-	-	396	2205
51192	-	460	560	80	464	555	2.1	–	–	-	-	-	-	477	2790
511/500	-	500	600	80	505	595	2.1	–	-	-	-	-	-	495	3015
511/530	-	530	640	85	535	635	3	–	-	-	-	-	-	558	3510
511/560	-	560	670	85	565	665	3	–	-	-	-	-	-	567	3735

Why Global Buyers Choose BMT Bearings

Stable Manufacturing Precision

Automated grinding and assembly lines ensure consistent dimensions and stable batch quality.

Low Noise & Smooth Operation

Optimized raceway finishing reduces vibration and improves running smoothness, especially for motor applications.

Long Service Life

High material purity and improved surface treatment reduce friction, heat, and wear during long-term use.

OEM & Custom Solutions

We support:

Non-standard sizes

Material customization

Clearance adjustment

Packaging branding

Export Experience

We serve customers across Europe, Southeast Asia, South America, and the Middle East with stable logistics and documentation support.

Application Areas

Our Single Direction Thrust Ball Bearings are widely used in:

Electric motors

Water pumps

Gearboxes

Agricultural machinery

Automotive systems

Conveyor systems

Textile machinery

Industrial fans

Machine tools

Automation systems

Different applications require different speed, load, and environment conditions. Our technical team provides selection support based on real working conditions.

Quality Control System

At BMT Bearings, every bearing is tested under strict procedures from raw material to final packaging.

We inspect:

Dimensional accuracy

Rotation precision

Noise level

Surface roughness

Hardness

Clearance consistency

Our production system follows ISO9001 and IATF16949 quality standards, ensuring consistent performance for OEM and industrial users.

Product Features

High axial load capacity

Stable and smooth rotation

Low vibration and low noise

Precision-ground raceways

Reliable continuous operation

High-quality bearing steel

Long service life

OEM customization available

Factory-direct pricing

Fast delivery capability

Industry-Oriented Engineering Support

Different industries require different bearing performance priorities:

Motor industry → low noise and high speed stability

Agricultural machinery → dust resistance and durability

Pump systems → continuous axial load stability

Our engineering team evaluates real working conditions before recommending suitable bearing models, helping reduce failure rates and maintenance costs.

Why BMT Bearings is Trusted Globally

BMT Bearings continues to grow through long-term cooperation with international customers based on:

Stable manufacturing capability

Consistent product quality

Fast and responsive communication

Reliable export service

Custom engineering support

Transparent production process

We believe long-term partnerships are built on performance stability, not short-term pricing.

FAQ

Can this bearing support radial load?

No. It is designed only for axial load in one direction.

Do you support OEM customization?

Yes. We offer full customization based on drawings, dimensions, and application needs.

What industries use this bearing most?

Electric motors, pumps, agricultural machinery, automotive systems, and automation equipment.

How do you ensure quality stability?

Through automated production lines, precision inspection, and ISO/IATF-based quality control.

Do you support bulk orders?

Yes. We support large-volume OEM and distributor orders with stable supply capacity.

Do you support international shipping?

Yes. We provide full export packaging and logistics coordination.

About BMT Bearings

BMT Bearings is a professional bearing manufacturer specializing in precision ball and roller bearings for global industrial markets.

Since 2004, we have focused on continuous improvement in manufacturing technology, product consistency, and customer service. Our goal is to provide reliable bearing solutions that improve equipment efficiency and reduce operational risk.

Hot Tags: Single Direction Thrust Ball Bearings

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Send Inquiry

Contact Info



Address

No.183,Longfeng,West of Zhangting industrial Zone,Yuyao,Ningbo,China


Tel

+86-15990260649


E-mail

info@demy-bearing.com

Submit specifications for Industrial Bearings, Deep Groove Ball Bearings, Taper Roller Bearings, and more. BMT’s team responds within 24 hours with competitive pricing for durable bearings.