Double Row Ball Slewing Bearing

Categories Double Row Ball Slewing Bearings, Slewing Bearing

Double Row Ball Slewing Bearing - Image 4

A Double Row Ball Slewing Bearing, it consists of two raceways, with two rows of steel balls inside.

It can bear axial loads, radial loads and a certain amount of overturning torque at the same time.

It has a compact structure and light weight, with good self-aligning performance.

It is widely used in medium and small construction machinery, lifting and transportation equipment, medical equipment, radar devices and other occasions requiring compact structure and medium load requirements.

Range of external diameter: 300mm to 6000mm

Ring material: 42CrMo / 50Mn/ C45

Ball/roller material: GCr15

Cage material: steel 20 or ZL102 cast aluminum alloy

Spacer material: nylon 6 / nylon 66

Quenching hardness of raceway: HRC55-62

Tooth type: no gear, internal gear, external gear

Delivery time: 15-30 days

VKUKEN Double-Row Ball Slewing Bearing

The VKUKEN double-row ball slewing bearing can carry axial load tilting moment and radial loads at the same time.The top ball mainly carries the axial load and positive tilting moment. The drop ball takes the opposite tilting moment. The VKUKEN double row ball slewing bearing consists of a inner ring outer ring.balls in double rows, spacers, sealing device, and other components. The rings structure can be divided into two types, integral type and split type.Generally,the integral type maintains a stronger rigidity. The split type is more convenient to adjust; the two segregate rings are fastened by bolts prior to delivery. The VKUKEN double row slewing bearing has cages (or spacing blocks) among the balls.Only when large loading is requested would the full ball type be applied. Loading capacity for full ball type is definitely larger.However, the increased friction generated by this design allows for the balls to be easily scratched.The double row slewing bearing is mainly for the working conditions when carrying an axial load, larger tilting moment, and where the mounting place is limited in radial direction. Features of Double Row Ball Sewing Ring Bearing •Compact structure: Double-row ball slewing ring bearing usually comprises 3 rings, steel balls and spacers can enter the upper and lower raceways directly. Two sets of steel ball are placed based on the force analysis. With such configuration, the 90° bearing angles of the upper and lower arc raceway enable the bearing to take large axial force and tilting moment. Special design is needed for the raceway when the radial force is greater than one tenth axial force. • Balanced load bearing:The two rows of steel balls cooperate with the arc raceways, which can bear axial loads, radial loads and a certain amount of overturning torque at the same time, and the load distribution is relatively uniform. • Good self-aligning ability: The arc-shaped raceway design gives it a certain self-aligning performance, which can compensate for small installation errors or slight deflection of the shaft, reducing additional stress caused by installation deviations. Basic Structure includes: Without gear(Type020) With external gear(Type 021/022) With internal gear(Type 023/024) Range of external diameter: 100 mm to 15000 mm Ring material: 42CrMo / 50Mn/ C45 Ball/roller material: GCr15 Cage material: steel 20 or ZL102 cast aluminum alloy Spacer material: nylon 6 / nylon 66 Quenching hardness of raceway: HRC55-62 Tooth type: no gear, internal gear, external gear

Internal gear(023/024 Series)

Bearing Model	Dimensions			Mounting Dimensions				Structural Dimension					Gear data					weight (kg)
	Dmm	dmm	Hmm	D1mm	D2mm	n	φmm	D3mm	d1mm	n1	H1mm	hmm	bmm	x	Mmm	Demm	z
023.25.500	616	384	106	580	420	20	18	482	477	4	96	26	60	0.5	5	257	72	100
024.25.500															6	350.4	59
023.25.560	676	444	106	640	480	20	18	542	537	4	96	26	60	0.5	5	417	84	115
024.25.560															6	410.4	69
023.25.630	746	514	106	710	550	24	18	612	607	4	96	26	60	0.5	6	482.4	81	130
024.25.630															8	475.2	60
023.25.710	826	594	106	790	630	24	18	692	687	4	96	26	60	0.5	6	560.4	94	140
024.25.710															8	555.2	70
023.30.800	942	658	124	898	702	30	22	777	771	6	114	29	80	0.5	8	619.2	78	200
024.30.800															10	614	62
023.30.900	1042	758	124	998	802	30	22	877	871	6	114	29	80	0.5	8	715.2	90	250
024.30.900															10	714	72
023.30.1000	1142	858	124	1098	902	36	22	977	971	6	114	29	80	0.5	10	814	82	300
024.30.1000															12	796.8	67
023.30.1120	1262	978	124	1218	1022	36	22	1097	1091	6	114	29	80	0.5	10	924	93	340
024.30.1120															12	916.8	77
023.40.1250	1426	1074	160	1374	1126	40	26	1215	1214	5	150	39	90	0.5	12	1012.8	85	580
024.40.1250															14	1013.6	73
023.40.1400	1576	1224	160	1524	1272	40	26	1365	1364	5	150	39	90	0.5	12	1156.8	97	650
024.40.1400															14	1153.6	83
023.40.1600	1776	1424	160	1724	1476	45	26	1565	1564	5	150	39	90	0.5	14	1349.6	97	750
024.40.1600															16	1350.4	85
023.40.1800	1976	1624	160	1924	1676	45	26	1765	1764	5	150	39	90	0.5	14	1545.6	111	820
024.40.1800															16	1542.4	97
023.50.2000	2215	1785	190	2149	1851	48	33	1965	1962	8	178	47	120	0.5	16	1702.4	107	1150
024.50.2000															18	1699.2	95
023.50.2240	2455	2025	190	2389	2091	48	33	2206	2202	8	178	47	120	0.5	16	1942.4	122	1500
024.50.2240															18	133.2	108
023.50.2500	2715	2285	190	2649	2351	56	33	2465	2462	8	178	47	120	0.5	18	2203.2	123	1700
024.50.2500															20	2188	110
023.50.2800	3015	2585	190	2949	2651	56	33	2765	2762	8	178	47	120	0.5	18	2491.2	139	1900
024.50.2800															20	2488	125
023.60.3150	3428	2872	226	3338	2962	56	45	3104	3102	8	214	56	150	0.5	20	2768	139	3300
024.60.3150															22	2758.8	126
023.60.3550	3828	3272	226	3738	3362	56	45	3504	3502	8	214	56	150	0.5	20	3168	159	3700
024.60.3550															22	3176.8	145
023.60.4000 024.60.4000	4278	3722	226	4188	3812	60	45	3954	3952	10	214	56	150	0.5	22	3616.8	165	4200
															2	3600	145
023.60.4500	4778	4222	226	4688	4312	60	45	4454	4452	10	214	56	150	0.5	22	4122.8	188	4700
024.60.4500															25	4110	165

External gear(021/022 Series)

Bearing Model	Dimensions			Mounting Dimensions				Structural Dimension					Gear data					weight (kg)
	Dmm	dmm	Hmm	D1mm	D2mm	n	φmm	D3mm	d1mm	n1	H1mm	hmm	bmm	x	Mmm	Demm	z
021,25.500 022.25.500	616	384	106	580	420	20	18	523	518	4	96	26	60	0.5	5	644	126	100
															6	646.8	105
021.25.560	676	444	106	640	480	20	18	583	578	4	96	26	60	0.5	5	704	138	115
022.25.560															6	706.8	115
021.25.630	746	514	106	710	550	24	18	653	648	4	96	26	60	0.5	6	790.8	129	130
022.25.630															8	790.4	96
021.25.710	826	594	106	790	630	24	18	733	728	4	96	26	60	0.5	6	862.8	141	140
022.25.710															8	862.4	105
021.30.800	942	658	124	898	702	30	22	829	823	6	114	29	80	0.5	8	982.4	120	200
022.30.800															10	988	96
021.30.900	1042	758	124	998	802	30	22	929	923	6	114	29	80	0.5	8	1086.4	133	250
022.30.900															10	1088	106
021.30.1000	1142	858	124	1098	902	36	22	1029	1023	6	114	29	80	0.5	10	1198	117	300
022.30.1000															12	1197.6	97
021.30.1120	1262	978	124	1218	1022	36	22	1148	1143	6	114	29	80	0.5	10	1318	129	340
022.30.1120															12	1317.6	107
021.40.1250	1426	1074	160	1374	1126	40	26	1286	1282	5	150	39	90	0.5	12	1497.6	122	580
022.40.1250															14	1495.2	104
021.40.1400	1576	1224	160	1524	1272	40	26	1436	1432	5	150	39	90	0.5	12	1641.6	134	650
022.40.1400															14	1649.2	115
021.40.1600	1776	124	160	1724	176	45	26	1636	1635	5	150	39	90	0.5	14	1845.2	129	750
022.40.1600															16	1852.8	113
021.40.1800	1976	1624	160	1924	1676	45	26	1836	1835	5	150	39	90	0.5	14	2055.2	144	820
022.40.1800															16	2060.8	126
021.50.2000	2215	1785	190	249	1851	48	33	2038	2035	8	178	47	120	0.5	16	2300.8	141	1150
022.50.2000															18	2300.4	125
021.50.2240	2455	2025	190	2389	2091	48	33	278	2275	8	178	47	120	0.5	6	2540.8	156	1500
022.50.2240															18	2552.4	139
021.50.2500	2715	2285	190	2649	2351	56	33	2538	2532	8	178	47	120	0.5	18	2804.4	153	1700
022.50.2500															20	2816	138
021.50.2800 022.50.2800	3015	2585	190	2949	2651	56	33	2838	2832	8	178	47	120	0.5	18	3110.4	170	1900
															20	3116	153
021.60.3150	3428	2872	226	3338	2962	56	45	3198	3196	8	214	56	150	0.5	20	3536	174	3300
022.60.3150															22	3537.6	158
021.60.3550	3828	3272	226	3738	3362	56	45	3598	3596	8	214	56	150	0.5	20	3936	94	3700
022.60.3550															22	3933.6	176
021.60.4000 022.60.4000	4278	3722	226	4188	3812	60	45	4048	4046	10	214	56	150	0.5	22	4395.6	197	4200
															25	4395	13
021.60.4500	4778	4222	226	4688	4312	60	45	4548	4546	10	214	56	150	0.5	22	4879.6	219	4700
022.60.4500															25	4895	193

No gear(020 Series)

Bearing Model	Dimensions			Mounting Dimensions				Structural Dimension					weight (kg)
Bearing Model	Dmm	dmm	Hmm	D1mm	D2mm	n	φmm	D3mm	d1mm	n1	H1mm	hmm	weight (kg)
020.25.500	616	384	106	580	420	20	18	482	477	4	96	26	100
020.25.560	676	444	106	640	480	20	18	542	537	4	96	26	115
020.25.630	746	514	106	710	550	24	18	612	607	4	96	26	130
020.25.710	826	594	106	790	630	24	18	692	687	4	96	26	140
020.30.800	942	658	124	898	702	30	22	777	771	6	114	29	200
020.30.900	1042	758	124	998	802	30	22	877	871	6	114	29	250
020.30.1000	1142	858	124	1098	902	36	22	977	971	6	114	29	300
020.30.1120	1262	978	124	1218	1022	36	22	1097	1091	6	114	29	340
020.40.1250	1426	1074	160	1374	1126	40	26	1215	1214	5	150	39	580
020.40.1400	1576	1224	160	1524	1272	40	26	1365	1364	5	150	39	650
020.40.1600	1776	1424	160	1724	1476	45	26	1565	1564	5	150	39	750
020.40 1800	1976	1624	160	1924	1676	45	26	1765	1764	5	150	39	820
020.50.2000	2215	1785	190	2149	1851	48	33	1965	1962	8	178	47	1150
020.50.2240	2455	2025	190	2389	2091	48	33	2206	2202	8	178	47	1500
020.50.2500	2715	2285	190	2649	2351	56	33	2465	2462	8	178	47	1700
020.50.2800	3015	2585	190	2949	2651	56	33	2765	2762	8	178	47	1900
020.60.3150	3428	2872	226	3338	2962	56	45	3104	3102	8	214	56	3300
020.60.3550	3828	3272	226	3738	3362	56	45	3504	3502	8	214	56	3700
020.60.4000	4278	3722	226	4188	3812	60	45	3954	3952	10	214	56	4200
020.60.4500	4778	4222	226	4288	4312	60	45	4454	4452	10	214	56	4700

1. Higher Load Capacity than Single-Row Ball Bearings

Two rows of balls share the load, significantly increasing axial load, radial load, and overturning moment capacity.
Suitable for applications where single-row ball slewing bearings reach their performance limit.

2. Improved Rigidity and Operational Stability

Dual load paths reduce elastic deformation under load.
Provides more stable rotation and better resistance to tilting, especially under eccentric or fluctuating loads.

3. Smooth Rotation with Controlled Friction

Ball-type rolling elements ensure smooth, low-noise operation.
Ideal for systems requiring continuous rotation or frequent slewing movements.

4. Optimized Balance of Performance and Cost

Compared with roller slewing bearings, double row ball designs offer lower weight and cost, while still delivering higher load capacity than single-row ball types.
An excellent cost-effective upgrade for medium-to-heavy duty applications.

5. Compact Structure with High Integration

Integrated bearing structure can support axial, radial, and moment loads simultaneously.
Simplifies equipment design and reduces overall system complexity.

6. Flexible Structural Configurations

Available with internal gear, external gear, or gearless designs.
Custom options for mounting holes, seals, lubrication systems, preload levels, and materials to match customer requirements.

7. Long Service Life and Low Maintenance

Optimized raceway geometry ensures even load distribution and reduced contact stress.
Proper sealing and lubrication design support long maintenance intervals and reliable long-term operation.

Excavator

In excavators, double row ball slewing bearings are installed between the upper structure and the lower undercarriage. They enable smooth and stable rotation of the upper body during digging, loading, and slewing operations.

Bearing advantages in this application

Supports combined axial load, radial load, and overturning moment
Improved rigidity compared with single-row designs
Stable rotation under frequent start-stop and shock loads
.

Crawler crane

In crawler cranes, the slewing bearing supports the rotating superstructure, allowing precise positioning of the boom while lifting and transporting heavy loads.

Bearing advantages in this application

Enhanced moment load capacity for lifting operations
Smooth slewing under asymmetric and variable loads
Good balance between load performance and bearing weight

Port machinery

Port machinery such as container cranes, stackers, and ship loaders rely on double row ball slewing bearings for continuous or frequent rotation of large structures during cargo handling.

Bearing advantages in this application

Reliable performance under continuous-duty cycles
Stable rotation with controlled friction
Suitable for medium-to-heavy loads without excessive structural size

Amusement facilities

In amusement facilities, these bearings are used in rotating rides, platforms, and support structures, where smooth motion and operational safety are critical.

Bearing advantages in this application

Smooth, low-noise rotation for passenger comfort
High reliability and long service life
Ability to handle combined loads with consistent motion control

VKUKEN has over 30 years of experience in bearing design and manufacturing. We can customize non-standard bearings according to customer drawings, or we can measure and create drawings of existing bearings on-site and then manufacture custom bearings based on those drawings. Our team of professional engineers has over 20 years of experience in bearing design and measurement.

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application engineer

Hi, I am Maxwell, I am an engineer in the field of bearing applications. I majored in mechanical and electromechanical engineering during college. After graduation, I worked for the top three "SKF" bearing companies in the world for ten years , during which I went to dozens of customers in different industries to help them solve problems in bearing applications; later I joined VKUKEN Bearing Manufacturing, and I will share bearing technical knowledge on this website from time to time. If you are a customer Please contact me to help you solve your problem; if you are also a technical expert in bearings, I am very willing to exchange technical knowledge about bearings with you.

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Double Row Ball Slewing Bearing

VKUKEN Double-Row Ball Slewing Bearing

Internal gear(023/024 Series)

External gear(021/022 Series)

No gear(020 Series)

1. Higher Load Capacity than Single-Row Ball Bearings

2. Improved Rigidity and Operational Stability

3. Smooth Rotation with Controlled Friction

4. Optimized Balance of Performance and Cost

5. Compact Structure with High Integration

6. Flexible Structural Configurations

7. Long Service Life and Low Maintenance

Excavator

Crawler crane

Port machinery

Amusement facilities

Bearing knowledge training

application engineer

Send us your requirements

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