Spherical Roller Bearings

232 Series Spherical Roller Bearings

The 232 series spherical roller bearings feature a medium-wide thick cross-section design, equipped with larger roller profiles compared to the 231 series for improved overall load capacity and shock resistance. Built with reliable self-aligning performance, the bearings deliver robust radial load support alongside moderate axial load tolerance, making them suitable for working conditions combining steady heavy static loads and periodic impact forces.

A full spectrum of cage options including CC stamped steel, E optimized internal design, and solid brass CA & MB variants are available to satisfy various lubrication schemes and rotational speed requirements.

This bearing line is widely specified for medium-to-large heavy-duty machinery, such as medium-sized cement rotary kilns, heavy industrial gearboxes, mining screening equipment, construction mixing plants and auxiliary metallurgical rolling equipment.

Size range: Inner Diameter: 170-700mm

Material: GCr15/GCr15SiMn/G20Cr2Ni4A

Load Capacity: High radial and axial load capacity

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

1. What are 232 Series Spherical Roller Bearings

The 232 series refers to heavy-duty spherical roller bearings with an enlarged cross-section and extra width. They feature thicker outer rings, larger and wider rollers, and an extremely rigid overall structure, engineered for large-scale machinery operating under ultra-heavy loads, severe impact forces and continuous full-load conditions.

2. Nomenclature of 232 Series Spherical Roller Bearings

Example: 23272CA/W33

232: Series code – the first digit "2" stands for double-row rollers; "32" denotes heavy-duty design with enlarged wide cross-section
72: Bore size code, corresponding to a bore diameter of 360 mm
CA: Heavy-duty brass cage
E: Reinforced rollers
K: Tapered bore
W33: Outer ring with centralized lubrication groove

3. Characteristics of 232 Series Spherical Roller Bearings

Thickest outer ring among bearings with identical bore sizes, delivering high structural rigidity and minimal deformation under heavy loads
Oversized rollers offer top-tier basic dynamic load rating and basic static load rating within equivalent dimensions
Excellent resistance to sustained heavy impact loads, ideal for crushing and grinding equipment
Large self-aligning capacity to offset eccentricity and deflection of large drums and support rollers
Most models adopt heavy-duty brass cages, resistant to fracture under high temperature and heavy load conditions

4. Applications of 232 Series Spherical Roller Bearings

Main support rollers for cement rotary kilns, vertical coal mills, large mineral autogenous mills, heavy metallurgical rolling mills, semi-autogenous grinding mills for mining, large calcining rotary furnaces

Series	Bearing Models	d (mm)	D (mm)	T (mm)	Approx Weight (KGS)
23218	23218CC / 23218E / 23218CA / 23218MB	90	160	52.4	4.5
23220	23220CC / 23220E / 23220CA / 23220MB	100	180	60.3	6.6
23222	23222CC / 23222E / 23222CA / 23222MB	110	200	69.8	9.6
23224	23224CC / 23224E / 23224CA / 23224MB	120	215	76	12
23226	23226CC / 23226E / 23226CA / 23226MB	130	230	80	14
23228	23228CC / 23228E / 23228CA / 23228MB	140	250	88	18.5
23230	23230CC / 23230E / 23230CA / 23230MB	150	270	96	23.5
23232	23232CC / 23232E / 23232CA / 23232MB	160	290	104	29
23234	23234CC / 23234E / 23234CA / 23234MB	170	310	110	36
23236	23236CC / 23236E / 23236CA / 23236MB	180	320	112	38.5
23238	23238CC / 23238E / 23238CA / 23238MB	190	330	120	46.1
23240	23240CC / 23240E / 23240CA / 23240MB	200	360	128	55.6
23244	23244CC / 23244E / 23244CA / 23244MB	220	400	144	77.7
23248	23248CC / 23248E / 23248CA / 23248MB	230	430	160	104.8
23252	23252CC / 23252E / 23252CA / 23252MB	260	480	174	137.3
23256	23256CC / 23256E / 23256CA / 23256MB	280	500	176	145
23260	23260CC / 23260E / 23260CA / 23260MB	300	540	192	195
23264	23264CC / 23264E / 23264CA / 23264MB	320	580	208	250
23268	23268CC / 23268E / 23268CA / 23268MB	330	620	224	295
23272	23272CC / 23272E / 23272CA / 23272MB	360	650	232	335
23276	23276CC / 23276E / 23276CA / 23276MB	380	680	240	375
23280	23280CC / 23280E / 23280CA / 23280MB	400	720	256	450
23284	23284CC / 23284E / 23284CA / 23284MB	420	760	272	520
23288	23288CC / 23288E / 23288CA / 23288MB	430	790	280	590
23292	23292CC / 23292E / 23292CA / 23292MB	460	830	296	675
23296	23296CC / 23296E / 23296CA / 23296MB	480	870	410	805

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.