Four Point Contact Ball Bearings

Four-point contact ball bearings are specialized bearings designed to withstand both radial and axial loads in a compact and efficient manner. They feature a unique design with four points of contact between the balls and the raceways, allowing for high load-carrying capacity and improved axial rigidity. These bearings are commonly used in applications such as robotics, machine tools, turntables, and slewing rings, where precise and smooth rotation under heavy loads is required. The four-point contact design ensures optimal load distribution, reduced friction, and enhanced operational stability, making them a reliable choice for demanding applications.

Technial Specification

Table 1

Bearing Designations	Boundary Dimensions				Basic Load Rating		Limited Speed		distance of	Shoulder Dimension			Mass
	Boundary Dimensions				Basic Load Rating		Limited Speed		working points	Shoulder Dimension			Mass
	d	D	B	r	Cr	Cor	Grease	Oil	a	da	Da	ra	Approx
	d	D	B	(min.)	Cr	Cor	Grease	Oil	a	(min.)	(max.)	(max.)	Approx
6204BI	20	47	14	1	23.5	15.3	12000	16000	23.5	25.5	41.5	1	0.129
6205BI	25	52	15	1	26.7	18.8	10000	14000	270	30.5	46.5	1	0.156
6206BI	30	62	16	1	36.3	27.6	8600	12000	32.6	35.5	56.5	1	0.241
6207BI	35	72	17	1.1	47.1	36.7	7500	10000	37.5	42	65	1	0.351
6208BI	40	80	18	1.1	55.9	46.5	6600	9000	42.7	47	73	1	0.451
6209BI	45	85	19	1.1	58.7	51.3	6100	8400	45.9	52	78	1	0.512
6210BI	50	90	20	1.1	65.4	58	5700	7900	49	57	83	1	0.575
6211BI	55	100	21	1.5	80	72.3	5200	7100	54.3	63.5	91.5	1.5	0.763
6212BI	60	110	22	1.5	91.7	87.6	4600	6300	60.6	68.5	101.5	1.5	0.983
6213BI	65	120	23	1.5	95.1	90.1	4300	5900	64.8	73.5	111.5	1.5	1.23
6214BI	70	125	24	1.5	103	99	4100	5600	68.3	78.5	116.5	1.5	1.35
6215BI	75	130	25	1.5	108	108	3900	5300	71.8	83.5	121.5	1.5	1.47
6216BI	80	140	26	2	126	128	3600	4900	77	90	130	2	1.8
6217BI	85	150	28	2	146	150	3400	4600	82.3	95	140	2	2.25
6218BI	90	160	30	2	167	173	3100	4300	87.5	100	150	2	2.77
6219BI	95	170	32	2.1	190	198	3000	4100	92.8	107	158	2	3.37
6220BI	100	180	34	2.1	201	213	2800	3800	98	112	168	2	4.02
6222BI	110	200	38	2.1	242	275	2500	3400	108.5	122	188	2	5.64
6304BI	20	52	15	1.1	27.4	18.1	11000	15000	25.2	27	45	1	0.179
6305BI	25	62	17	1.1	40.8	28	9200	13000	30.5	32	55	1	0.285
6306BI	30	72	19	1.1	49.5	36.6	7800	11000	35.7	37	65	1	0.426
6307BI	35	80	21	1.5	61.2	46.4	7000	9600	40.3	43.5	71.5	1.5	0.565
6308BI	40	90	23	1.5	74.1	57.6	6200	8500	45.5	48.5	81.5	1.5	0.778
6309BI	45	100	25	1.5	87.9	70	5500	7600	50.8	53.5	91.5	1.5	1.04
6310BI	50	110	27	2	103	83.7	5000	6900	56	60	100	2	1.35
6311BI	55	120	29	2	119	98.5	4500	6200	61.3	65	110	2	1.72
6312BI	60	130	31	2.1	145	126	4100	5700	67.2	72	118	2	2.17
6313BI	65	140	33	2.1	164	145	3800	5300	72.1	77	128	2	2.36
6314BI	70	150	35	2.1	184	165	3600	4900	77	82	138	2	3.25
6315BI	75	160	37	2.1	200	187	3400	4600	82.3	87	148	2	3.9
_6316BI	80	170	39	2.1	217	210	3100	4300	87.5	92	158	2	4.63
6317BI	85	180	41	3	234	234	3000	4100	92.8	99	166	2.5	5.45
6318BI	90	190	43	3	252	260	2800	3800	98	104	176	2.5	6.36
6319BI	95	200	45	3	269	287	2600	3600	103.3	109	186	2.5	7.37

Advantages

High Load-Carrying Capacity: Four-point contact ball bearings are specifically designed to handle both radial and axial loads simultaneously. The unique design with four points of contact allows for efficient load distribution, enabling these bearings to carry heavy loads with ease. This makes them ideal for applications that require high load capacity, such as in robotics, machine tools, and turntables.
Improved Axial Rigidity: The four-point contact design of these bearings provides enhanced axial rigidity compared to other bearing types. This means that they can withstand axial forces without excessive deformation or loss of performance. The improved axial rigidity ensures stable and precise rotation, making them suitable for applications that demand high precision and minimal deflection, such as slewing rings.
Compact Design: Four-point contact ball bearings have a relatively compact design compared to other types of bearings with similar load-carrying capacity. The four-point contact arrangement allows for a smaller overall bearing size, which is advantageous in applications with limited space or weight constraints. The compact design also contributes to reduced friction and energy consumption.
Smooth and Precise Rotation: The four-point contact design ensures smooth and precise rotation of the bearing. The multiple contact points distribute the load evenly, minimizing the risk of uneven wear and reducing friction. This results in smoother operation, lower noise levels, and improved overall performance.
Versatility in Applications: Four-point contact ball bearings find applications in a wide range of industries and machinery. They are commonly used in robotics, machine tools, turntables, and slewing rings, but can also be found in construction equipment, cranes, and other heavy-duty applications. Their ability to handle both radial and axial loads, along with their compact design and precise rotation, makes them versatile components for various engineering applications.
Long Service Life: Four-point contact ball bearings are designed to provide long service life and reliable performance. The optimized load distribution and reduced friction result in lower wear and extended bearing life. This contributes to reduced maintenance requirements and increased uptime in critical applications.