Product Details

Double Row Different Diameter Ball Slewing Bearing

The double-row ball slewing bearing is an advanced mechanical transmission device that uses double-row spherical rolling elements in its design to meet the needs of high load-bearing capacity and excellent stability. Its structure mainly includes inner and outer rings, double rows of spherical rolling elements, sealing devices and lubrication systems.

The working principle of this slewing bearing is based on the point contact rolling of rolling elements. When an external load acts on the support, the double-row spherical rolling elements roll in point contact between the inner and outer rings, effectively dispersing and transmitting the load. Compared with the single-row ball slewing bearing, the double-row ball-type slewing bearing performs better in terms of load-bearing capacity. Its double-row ball structure provides a larger support area and enhances the stability of the support.

Specification

In terms of application fields, double row ball slewing bearings are widely used in construction engineering, wind power generation equipment, heavy machinery and other fields. In construction projects, it is used for the smooth rotation of tower cranes, cranes and other equipment; in wind power generation equipment, it supports the steering control system of wind turbines; and in the field of heavy machinery, such as mining equipment and excavators, its high load-bearing capacity Making it a critical rotational support.

NO.	De	D	d	H	b	m	z	x	k	Q&T	KG
021.25.500	644	616	384	106	60	5	126	+0.5	0.1	52	130
022.25.500	646. 8	616	384	106	60	6	105	+0.5	0.1	62	130
021.25.560	704	676	444	106	60	5	138	+0.5	0.1	52	146
022.25.560	706. 8	676	444	106	60	6	115	+0.5	0.1	62	147
021.25.630	790. 8	746	514	106	60	6	129	+0.5	0.1	62	173
022.25.630	790. 4	746	514	106	60	8	96	+0.5	0.1	83	170
021.25.710	862. 8	826	594	106	60	6	141	+0.5	0.1	62	190
022.25.710	862. 4	826	594	106	60	8	105	+0.5	0.1	83	187
021.30.800	982. 4	942	658	124	80	8	120	+0.5	0.1	111	305
022.30.800	988	942	658	124	80	10	96	+0.5	0.1	140	307
021.30.900	1086.4	1042	758	124	80	8	133	+0.5	0.1	111	349
022.30.900	1088	1042	758	124	80	10	106	+0.5	0.1	140	348
021.30.1000	1198	1142	858	124	80	10	117	+0.5	0.1	140	396
022.30.1000	1197.6	1142	858	124	80	12	97	+0.5	0.1	167	391
021.30.1120	1318	1262	978	124	80	10	129	+0.5	0.1	140	445
022.30.1120	1317.6	1262	978	124	80	12	107	+0.5	0.1	167	439
021.40.1250	1497.6	1426	1074	160	90	12	122	+0.5	0.1	188	784
022.40.1250	1495.2	1426	1074	160	90	14	104	+0.5	0.1	219	774
021.40.1400	1641.6	1576	1224	160	90	12	134	+0.5	0.1	188	870
022.40.1400	1649.2	1576	1224	160	90	14	115	+0.5	0.1	219	878
021.40.1600	1845.2	1776	1424	160	90	14	129	+0.5	0.1	219	995
022.40.1600	1852.8	1776	1424	160	90	16	113	+0.5	0.1	250	1003
021.40.1800	2055.2	1976	1624	160	90	14	144	+0.5	0.1	219	1147
022.40.1800	2060.8	1976	1624	160	90	16	126	+0.5	0.1	250	1151
021.50.2000	2300.8	2215	1785	190	120	16	141	+0.5	0.1	333	1794
022.50.2000	2300.4	2215	1785	190	120	18	125	+0.5	0.1	375	1780
021.50.2240	2540.8	2455	2025	190	120	16	156	+0.5	0.1	333	2017
022.50.2240	2552.4	2455	2025	190	120	18	139	+0.5	0.1	375	2048
021.50.2500	2804.4	2715	2285	190	120	18	153	+0.5	0.1	375	2246
022.50.2500	2816	2715	2285	190	120	20	138	+0.5	0.1	418	2280
021.50.2800	3110.4	3015	2585	190	120	18	170	+0.5	0.1	375	2553
022.50.2800	3116	3015	2585	190	120	20	153	+0.5	0.1	418	2563
021.60.3150	3536	3428	2872	226	150	20	174	+0.5	0.1	522	4428
022.60.3150	3537.6	3429	2873	227	151	22	158	+0.5	0.1	574	4414
021.60.3550	3936	3828	3272	226	150	20	194	+0.5	0.1	522	5012
022.60.3550	3933.6	3828	3272	226	150	22	176	+0.5	0.1	574	4967
021.60.4000	4395.6	4278	3722	226	150	22	197	+0.5	0.1	574	5706
022.60.4000	4395	4278	3722	226	150	25	173	+0.5	0.1	652	5656
021.60.4500	4879.6	4778	4222	226	150	22	219	+0.5	0.1	574	6293
022.60.4500	4895	4778	4222	226	150	25	193	+0.5	0.1	652	6385

Frequently Asked Questions

Expert Insights and Reliable Solutions to Your Most Common Questions.

1. What types of slewing bearings does ZZ Slewing Bearing provide?

ZZ Slewing Bearing supplies a full range of slewing bearings to meet different industrial needs:

Single row four point contact slewing bearings Application: medium loads, precise rotation.
Double row ball bearings Application: higher radial and axial loads.
Cross roller bearings –Application: high rigidity, suitable for robots and machining centers.
Three row roller bearings – Application: extreme loads in heavy equipment.
Ball combine roller bearings –Application: precise rotational adjustment applications.
Customized bearings – tailored for specific equipment requirements.

2. How do I choose the right bearing for my application?

Typical selection parameter for ZZ clients:

Load type: axial, radial, and tilting moment.

Rotation RPM: ensures long service life.

Installation space & mounting dimensions: inner/outer ring diameter, bolt circle.

Precision & rigidity requirements: critical for cranes, excavators, and robots.

ZZ engineers provide professional selection guidance according to your equipment and drawings.

3. What materials does ZZ Slewing Bearing use for slewing bearings?

ZZ Slewing Bearing selects materials for strength, wear resistance, and long-term durability:

Slewing ring: 42CrMo, 50Mn, C45N, 40CrNiMo, C48E.

Special forging spare parts: carburized/hardened steels for gear teeth (20CrMnTi, 18CrNiMo7‑6).

Corrosion resistant: SS 304, 316L, duplex stainless steel.

Surface treatments: heat treatment, quenching, carburizing, induction hardening, and surface coating(Four-Layer Packing, Strong Anti-Rust Oil, Black Oxide Treatment, Jet Black Paint Finish, Hot-Dip Galvanizing (CGL), Electro-Galvanizing (EGL), Hot-Dip Galvanizing + Paint Finish)

4. How can ZZ Slewing Bearing achieve maximum service life?

Correct installation with flat surfaces.

Proper lubrication using grease.

Avoid overloading or shock loads over capacity.

Monitor operating conditions regularly to prevent debris entry.

5. What causes abnormal noise or vibration in bearings?

Typical factors observed by ZZ engineers:

Insufficient or incorrect lubrication.
(dust, metal particles) in raceways.
Rolling element or track damage.
Uneven mounting surfaces or misalignment.
Incorrect bolt torque(below grade 8.8) or preloading.

6. What are lead times and lifetime guarantee?

In-stock: 3–7 days.

Custom: 2–6 weeks depending on size, load, and precision.

Warranty: 1 year

Lifetime Free Spare Parts: Glue, seals, steel ball

7. Does ZZ provide installation and technical support?

Yes — ZZ Slewing Bearing offers:

Detailed installation manuals.

Online engineering support.

Guidance for lubrication, maintenance, and troubleshooting solution.

8. How do ZZ Slewing Bearing differ from competitors?

Full range of materials and heat treatments for various load conditions.

High precision and strict quality inspection standards.

Engineering support before and after delivery.

Customization to exact equipment requirements.

Proven performance in cranes, excavators, robotics, wind turbines, and heavy machinery etc.

ZZ Slewing Bearing (Shanghai) Co., Ltd

Leading Slew Drive & Slewing Bearing Manufacturer in China.

ZZ products are applied globally in solar tracking systems, wind power systems, satellite communications, and numerous other globally connected industries.