Product Details

High Precision Slewing Bearing Rust Prevention

External Gear Slewing Bearing Manufacturer Excavator

External Gear Slewing Bearing Manufacturer

Cranes rely on slewing bearings to support heavy loads and provide safe, stable rotation. These bearings connect the crane superstructure to its undercarriage, ensuring smooth lifting and swinging under demanding conditions.

Our range includes double row ball and three row roller slewing bearings, each designed for different load requirements. Double row ball bearings offer reliable performance for moderate loads, while three row roller bearings handle extreme axial, radial, and tilting moment loads in heavy-duty cranes.

Specification

Slewing bearings for crane are critical components that ensure smooth rotation, reliable lifting, and stable operation under extreme loads. These bearings connect the crane’s superstructure to its undercarriage, enabling 360° rotation while supporting heavy lifting tasks. Their strength and precision make them indispensable in mobile cranes, tower cranes, and construction equipment.

Structural Advantages

Cranes require slewing bearings that can manage multiple load types. Double row ball slewing bearings handle medium to heavy axial and radial loads, while three row roller slewing bearings are designed for extreme lifting demands. The three row design distributes axial, radial, and tilting moment loads evenly, which enhances safety and performance during crane operations.

NO.	De	D	d	H	b	m	z	x	k	Normalizing	Q&T	KG
131.25.500	664	634	366	148	80	5	130	0.5	0.1	50	67	211
132.25.500	664.8	634	366	148	80	6	108	0.5	0.1	60	80	210
131.25.560	724	694	426	148	80	5	142	0.5	0.1	50	67	236
132.25.560	724.8	694	426	148	80	6	118	0.5	0.1	60	80	235
131.25.630	808.8	764	496	148	80	6	132	0.5	0.1	60	80	275
132.25.630	806.4	764	496	148	80	8	98	0.5	0.1	80	110	270
131.25.710	886.8	844	576	148	80	6	145	0.5	0.1	60	80	310
132.25.710	886.4	844	576	148	80	8	108	0.5	0.1	80	110	306
131.32.800	1006.4	964	636	182	120	8	123	0.5	0.1	121	167	515
132.32.800	1008	964	636	182	120	10	98	0.5	0.1	151	209	512
131.32.900	1102.4	1064	736	182	120	8	135	0.5	0.1	121	167	577
132.32.900	1108	1064	736	182	120	10	108	0.5	0.1	151	209	591
131.32.1000	1218	1164	836	182	120	10	119	0.5	0.1	151	209	662
132.32.1000	1221.5	1164	836	182	120	12	99	0.5	0.1	181	251	662
131.32.1120	1338	1284	956	182	120	10	131	0.5	0.1	151	209	746
132.32.1120	1341.6	1284	956	182	120	12	109	0.5	0.1	181	251	746
131.40.1250	1509.6	1445	1055	220	150	12	123	0.5	0.1	229	314	1194
132.40.1250	1509.2	1445	1055	220	150	14	105	0.5	0.1	263	366	1183
131.40.1400	1665.6	1595	1205	220	150	12	136	0.5	0.1	229	314	1364
132.40.1400	1663.2	1595	1205	220	150	14	116	0.5	0.1	263	366	1345
131.40.1600	1873.2	1795	1405	220	150	14	131	0.5	0.1	263	366	1577
132.40.1600	1868.8	1795	1405	220	150	16	114	0.5	0.1	302	417	1545
131.40.1800	2069.1	1995	1605	220	150	14	145	0.5	0.1	263	366	1766
132.40.1800	2076.8	1995	1605	220	150	16	127	0.5	0.1	302	417	1782
131.20.2000	2236.8		1853	132	106	16	137	0.5	0.1		311	958
131.25.2000	2268.8		1819	147	117	16	139	0.5	0.1		326	1277
131.45.2000	2300.8	2221	1779	231	160	16	141	0.5	0.1	322	445	2254
132.45.2000	2300.4	2221	1779	231	160	18	125	0.5	0.1	362	501	2235
131.25.2240	2516.4		2059	147	117	18	137	0.5	0.1		366	1447
131.32.2240	2552.4		2022	181	139	18	139	0.5	0.1		435	2074
131.45.2240	2556.8	2461	2019	231	160	16	157	0.5	0.1	322	445	2626
132.45.2240	2552.4	2461	2019	231	160	18	139	0.5	0.1	362	501	2584
131.25.2500	2786.4		2319	147	117	18	152	0.5	0.1		366	1645
131.32.2500	2822.4		2282	181	139	18	154	0.5	0.1		435	2373
131.45.2500	2822.4	2721	2279	231	160	18	154	0.5	0.1	362	501	2925
132.45.2500	2816	2721	2279	231		20	138	0.5	0.1	402	556	2867
131.25.2800	3096		2619	147	117	20	152	0.5	0.1	203	407	1874
131.32.2800	3136		2582	181	139	20	154	0.5	0.1		483	2705
131.40.2800	3136		2562	220	170	20	154	0.5	0.1		591	3430
131.45.2800	3110.4	3021	2579	231	160	18	170	0.5	0.1	362	501	3221
132.45.2800	3116	3021	2579	231	160	20	153	0.5	0.1	402	556	3233
131.32.3150	3476		2932	181	139	20	171	0.5	0.1		483	2969
131.40.3150	3515.6		2912	220	170	22	157	0.5	0.1		650	4003
131.50.3150	3536	3432	2868	270	180	20	174	0.5	0.1	452	626	5276
132.50.3150	3537.6	3432	2868	270	180	22	158	0.5	0.1	498	689	5260
131.32.3550	3889.6		3332	181	139	22	174	0.5	0.1		532	3411
131.40.3550	3911.6		3312	220	170	22	175	0.5	0.1		650	4468
131.50.3550	3936	3832	3268	270	180	20	194	0.5	0.1	452	626	5998
132.50.3550	3933.6	3832	3268	270	180	22	176	0.5	0.1	498	689	5944
131.32.4000	4351.6		3782	181	139	22	195	0.5	0.1		531	3940
131.40.4000	4363.2		3762	220	170	24	179	0.5	0.1		710	5045
131.50.4000	4395.6	4282	3718	270	180	22	197	0.5	0.1	498	689	6833
132.50.4000	4395	4282	3718	270	180	25	173	0.5	0.1	565	783	6772
131.40.4500	4867.2		4262	220	170	24	200	0.5	0.1		710	5681
131.50.4500	4901.6	4782	4218	270	180	22	220	0.5	0.1	498	689	7809
132.50.4500	4895	4782	4218	270	180	25	193	0.5	0.1	565	783	7674

Durability and Materials

Each slewing bearing is manufactured from high-strength alloy steel, treated with heat-hardening processes to resist wear and fatigue. Precision machining ensures smooth rolling, while robust seals protect against dirt, moisture, and construction debris. This reduces downtime and extends service life, even under harsh site conditions.

Applications in Cranes

In crane applications, slewing bearings are responsible for stability, rotation, and safe lifting. During operation, they distribute stress evenly across the structure, protecting both the crane and its load. For example, in tower cranes, slewing bearings allow precise control over heavy materials at great heights. In mobile cranes, they enable stable lifting on uneven surfaces. Without these bearings, cranes would not be able to deliver safe and efficient lifting performance (learn more about cranes on ZZ).

Performance Benefits

Smooth and precise 360° rotation
High load-bearing capacity for heavy-duty lifting
Enhanced operator safety with balanced stress distribution
Extended service life through wear-resistant materials
Reduced maintenance from advanced sealing systems

Why Choose Slewing Bearings for Crane

Downtime in crane operations can cause costly delays. High-quality slewing bearings minimize risk by delivering reliable rotation and load handling. They provide stability and efficiency in demanding lifting tasks, making them a smart investment for construction and industrial projects.

Summary

Slewing bearings for crane deliver strength, durability, and reliability in heavy lifting applications. By supporting extreme loads and ensuring smooth rotation, these bearings play a vital role in crane safety and performance. For a deeper understanding of their role in heavy machinery,

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.