Spherical Roller Bearings

222 Series Spherical Roller Bearings

The 222 series spherical roller bearings are the most versatile and widely adopted general-purpose range, featuring a standard narrow-width cross-section and symmetrical barrel roller layout. This standard structural design delivers a balanced combination of structural rigidity, smooth rotational performance and cost-effectiveness, covering conventional standard load ratings for universal medium-duty operating conditions. Excellent inherent self-aligning capability effectively compensates for assembly errors and shaft bending deflection, preventing abnormal friction and premature bearing wear during continuous operation.

Supplied with complete cage configurations including CC stamped steel, E optimized internal geometry, and solid brass CA & MB variants, this series flexibly adapts to diverse rotational speed ranges and different equipment maintenance cycles, providing stable and consistent performance for long-term continuous operation.

Thanks to its high compatibility and reliable universal performance, the 222 series serves as the preferred standard solution for most medium-load rotary components. It is extensively applied in medium-sized mining machinery, paper processing equipment, textile machinery, industrial fan blowers, light construction machinery and general industrial speed reducers.

Size range: Inner Diameter: 50-230 mm

Material: GCr15/GCr15SiMn/G20Cr2Ni4A

Load Capacity: High radial and axial load capacity

Cage Types: CC / E /CA / MB / others

1. What are 222 Series Spherical Roller Bearings

The 222 series are double-row spherical roller bearings with medium wide cross-section, the most widely used general-purpose spherical roller bearings on the market. Compared with the 213 series, they adopt an expanded roller arrangement for higher load capacity and stable self-aligning performance, capable of bearing combined radial and axial loads with excellent versatility.

2. Designation System of 222 Series Spherical Roller Bearings

Take model 22220CC/W33 as an example for detailed breakdown:

222: Series code. The digit 2 means double-row rollers; 22 refers to medium wide cross-section.
20: Bore code, corresponding to a bore diameter of 100 mm.
CC: Stamped steel cage; CA: Machined brass cage; E: Optimized rollers for enhanced load rating.
K: Tapered bore; W33: Outer ring with lubrication groove; C3: Increased internal clearance specially for vibrating operating conditions.

3. Characteristics of 222 Series Spherical Roller Bearings

Wider width than the 213 series, featuring larger roller contact area and higher basic load ratings.
Self-aligning angle ranges from 0.5° to 1°, offering stronger tolerance against installation misalignment.
Complete size range covering small to medium dimensions, with abundant stock and low replacement cost.
Optional lubrication groove structure, suitable for equipment running continuously 24 hours a day.
Able to withstand steady heavy loads as well as intermittent shock loads.

4. Applications of 222 Series Spherical Roller Bearings

Cement conveyors, mine belt pulleys, air blowers, water pumps, press rolls for paper-making machinery, concrete mixing equipment, auxiliary mill rolls, general industrial reducers.

Series	Bearing Models	d (mm)	D (mm)	T (mm)	Approx Weight (KGS)
22205	22205CC / 22205E / 22205CA / 22205MB	25	52	18	0.18
22206	22206CC / 22206E / 22206CA / 22206MB	30	62	20	0.28
22207	22207CC / 22207E / 22207CA / 22207MB	35	72	23	0.44
22208	22208CC / 22208E / 22208CA / 22208MB	40	80	23	0.53
22209	22209CC / 22209E / 22209CA / 22209MB	45	85	23	0.59
22210	22210CC / 22210E / 22210CA / 22210MB	50	90	23	0.62
22211	22211CC / 22211E / 22211CA / 22211MB	55	100	25	0.83
22212	22212CC / 22212E / 22212CA / 22212MB	60	110	28	1.15
22213	22213CC / 22213E / 22213CA / 22213MB	65	120	31	1.5
22214	22214CC / 22214E / 22214CA / 22214MB	70	125	31	1.66
22215	22215CC / 22215E / 22215CA / 22215MB	75	130	31	1.7
22216	22216CC / 22216E / 22216CA / 22216MB	80	140	33	2.1
22217	22217CC / 22217E / 22217CA / 22217MB	85	150	36	2.65
22218	22218CC / 22218E / 22218CA / 22218MB	90	160	40	3.35
22219	22219CC / 22219E / 22219CA / 22219MB	95	170	43	4.2
22220	22220CC / 22220E / 22220CA / 22220MB	100	180	46	4.85
22222	22222CC / 22222E / 22222CA / 22222MB	110	200	53	7.05
22224	22224CC / 22224E / 22224CA / 22224MB	120	215	58	9.2
22226	22226CC / 22226E / 22226CA / 22226MB	130	230	64	11.5
22228	22228CC / 22228E / 22228CA / 22228MB	140	250	68	14
22230	22230CC / 22230E / 22230CA / 22230MB	150	270	73	18
22232	22232CC / 22232E / 22232CA / 22232MB	160	290	80	23
22234	22234CC / 22234E / 22234CA / 22234MB	170	310	86	28
22236	22236CC / 22236E / 22236CA / 22236MB	180	320	86	29.5
22238	22238CC / 22238E / 22238CA / 22238MB	190	330	92	35.5
22240	22240CC / 22240E / 22240CA / 22240MB	200	360	98	43
22244	22244CC / 22244E / 22244CA / 22244MB	220	400	108	59
22248	22248CC / 22248E / 22248CA / 22248MB	230	430	120	80
22252	22252CC / 22252E / 22252CA / 22252MB	260	480	130	105
22256	22256CC / 22256E / 22256CA / 22256MB	280	500	130	109
22260	22260CC / 22260E / 22260CA / 22260MB	300	530	140	145
22264	22264CC / 22264E / 22264CA / 22264MB	320	580	150	165
22268	22268CC / 22268E / 22268CA / 22268MB	330	620	165	217
22272	22272CC / 22272E / 22272CA / 22272MB	360	650	170	250

Production Process

Blueprint · Designing Precision

Given the structural characteristics of crossed roller bearings (rollers arranged in a 90° cross pattern), our technical team uses 3D CAD and finite element analysis (FEA) software to accurately calculate raceway angles, spacing, and interference.

Customizing products based on customer operating conditions, we benchmark against P2/P4/P5 tolerance classes and simulate post-assembly rotational precision in advance. The blueprint serves as the sole standard guiding all subsequent turning, grinding, and inspection processes.

Turning & Grinding · Rough to Mirror

Turning and grinding are the core processes that determine the bearing's geometric precision. We use high-rigidity CNC lathes for step-by-step ring processing, ensuring basic inner/outer diameter and raceway dimensions through rough, semi-finish, and finish turning while leaving grinding allowances.

We employ plunge grinding with formed grinding wheels for the V-shaped raceways of crossed roller bearings, and perform combination matching for the split inner/outer rings to ensure rotational plane runout meets P5 or higher standards.

Assembly · Interlocking Precision

The assembly of crossed roller bearings is more delicate than standard bearings: rollers must be arranged in an alternating cross pattern and precisely guided by spacers or cages.

All components are ultrasonically cleaned, dried, and grouped according to measured dimensions. High rigidity and stable torque are then imparted to the crossed roller bearings through negative clearance or preload adjustments. Assembly is completed in a constant temperature and humidity cleanroom to ensure P4/P2 level precision.

Inspection · Not Missing a Micron

As tolerance classes P5, P4, and P2 become progressively stricter, our inspection equipment and processes are upgraded accordingly:

We use high-precision roundness measuring instruments for dimensional tolerances, dial indicators with dedicated test mandrels for radial and axial runout, profilometers and Coordinate Measuring Machines (CMM) to verify raceway profiles and angles, and dedicated clearance and torque testers to determine clearance and starting torque.

Packaging · Anti-Rust & Protection

The packaging process is equally strict, ensuring zero loss of precision for the crossed roller bearings from the factory until pre-installation.

Eco-friendly anti-rust oil is evenly sprayed to ensure no residual particles in the inner cavity. Each bearing is vacuum-sealed in a thickened PE bag and film for water and dust protection, then boxed using wrapping tape. The outer carton is lined with high-density foam and pearl cotton to prevent transport collisions, and is marked with the model, precision grade (P5/P4/P2), and production batch number.