Spherical Roller Bearings

233 Series Spherical Roller Bearings

The 233 series spherical roller bearings adopt an extra-wide internal roller arrangement, featuring the broadest roller profile among standard medium-bore spherical roller bearing series. The expanded roller contact surface greatly boosts both dynamic and static load ratings, granting outstanding shock resistance for low and medium rotational speed working conditions.

We supply a complete selection of cage types including CC stamped steel, E optimized internal geometry, and solid brass CA & MB cages, which maintain stable lubricant retention during long-term continuous heavy-load operation.

Engineered for heavy-duty machinery that demands maximum load capacity with constrained medium outer diameter dimensions, this bearing series is extensively deployed on large mineral crushers, heavy vibrating screens, bulk material conveying machinery and industrial heavy mixing rollers.

1. What Are 233 Series Spherical Roller Bearings

The 233 series are extra-wide heavy-duty double-row spherical roller bearings. They boast the largest cross-sectional width among large-bore bearing ranges, fitted with extra-long and thickened double-row rollers. Specially developed for ultra-heavy industrial machinery subjected to combined extreme radial and axial loads, they serve as dedicated bearings for extreme heavy-load working conditions.

2. Nomenclature of 233 Series Spherical Roller Bearings

Model Example: 23356CA/W33

233: Series code – digit "2" represents double-row rollers; "33" stands for extra-wide, heavy-duty large-bore construction
56: Bore code, bore diameter equals 280 mm
CA: Reinforced brass cage
W33: Circumferential lubrication groove on outer ring
C4: Extra large internal clearance for high-temperature service

3. Features of 233 Series Spherical Roller Bearings

Extra-wide roller arrangement delivers far higher load capacity than 230 / 231 / 232 series bearings
Capable of enduring tremendous radial loads plus heavy bidirectional axial thrust simultaneously
Robust heavy-duty overall structure with outstanding vibration and impact resistance
Stable self-aligning performance, accommodating eccentric rotation of extra-large cylinders
Standard circumferential oil groove, compatible with centralized automatic lubrication systems

4. Applications of 233 Series Spherical Roller Bearings

Large vertical roller mills, heavy-duty mining ball mills, metallurgical heavy plate rolling mills, large calcining kilns, ultra-heavy ore crushers

Series	Bearing Models	d (mm)	D (mm)	T (mm)	Approx Weight (KGS)
23320	23320CC / 23320E / 23320CA / 23320MB	100	215	82.6	4.4
23322	23322CC / 23322E / 23322CA / 23322MB	110	240	92.1	20.2
23324	23324CC / 23324E / 23324CA / 23324MB	120	260	106	29.4
23326	23326CC / 23326E / 23326CA / 23326MB	130	280	112	34.2
23328	23328CC / 23328E / 23328CA / 23328MB	140	300	118	40.5
23330	23330CC / 23330E / 23330CA / 23330MB	150	320	128	53.6
23332	23332CC / 23332E / 23332CA / 23332MB	160	340	136	61.3
23334	23334CC / 23334E / 23334CA / 23334MB	170	360	140	70.3
23336	23336CC / 23336E / 23336CA / 23336MB	180	380	150	86.4
23338	23338CC / 23338E / 23338CA / 23338MB	190	400	155	97.1
23340	23340CC / 23340E / 23340CA / 23340MB	200	420	165	108
23344	23344CC / 23344E / 23344CA / 23344MB	220	460	180	145

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.