Product Introduction

The 32200 series is a wide-profile, heavy-duty, general-purpose series. It serves as a widened, upgraded version of the 30200 series—featuring longer rollers and higher load-carrying capacity while maintaining a moderate outer diameter and contact angle—making it a primary choice for heavy-duty gearboxes and mining machinery.

Single-row tapered Roller Bearings are among the most widely used rolling bearings in industry. They feature an inner ring with a tapered raceway and a large guide flange, an outer ring with a cup-shaped tapered raceway, and a single row of tapered rollers positioned between them. The lines of action of all tapered surfaces converge at a single point on the bearing axis, ensuring pure rolling motion for the rollers. As separable bearings, the inner ring assembly and outer ring can be mounted independently. They are capable of simultaneously supporting radial loads and unidirectional axial loads; typically, they are installed in opposing pairs to provide bidirectional axial location. They find extensive application in sectors such as automotive, construction machinery, mining, and speed reducers.

Series Positioning

The 32200 series carries the diameter series code "22" and features a contact angle of approximately 14° to 16°, classifying it as having a standard, small contact angle. Compared to the 30200 series, the 32200 series shares the same (or slightly larger) outer diameter for a given inner diameter but offers significantly greater width and longer rollers, resulting in substantially enhanced radial and axial load-carrying capacities. 

Key Features

Wide Series, High Load Capacity: For the same inner diameter, the width is 4–8 mm greater than the 30200 series; longer rollers result in a load capacity increase of approximately 40%–60%.

Moderate Outer Diameter: The outer diameter is identical or similar to the 30200 series, allowing for upgrades without increasing the housing bore size.

High Versatility: The contact angle is similar to the 30200 series, and application scenarios overlap significantly, yet it offers a higher load capacity limit.

Preferred for Heavy-Duty Conditions: Standard configuration for medium-to-heavy-duty applications such as gearboxes, mining equipment, and cranes.

Dimensional Parameter Table

The basic dimensions of WGHB Tapered Roller Bearings are listed in the dimensional data sheet

Single Row Tapered Roller Bearings: Most basic and widely used tapered bearing. Usually fitted as one of an opposing pair. During equipment assembly, can be set to the required clearance (end play) or preload condition to optimize performance. 

Single row (Type 30000): The most common type; primarily accommodates combined loads with a dominant radial component.

Inner diameter size range: 20mm~1270mm

Outer diameter range: 40mm~1465mm

Width size range: 15mm~240mm

Double Row Tapered Roller Bearings: Double row tapered bearing arrangements offer increased load capacity over single types.

Double row (Type 350000): Capable of supporting radial loads as well as bidirectional axial loads; commonly used in applications such as passenger car wheel hubs.

Inner diameter size range: 38mm~1560mm

Outer diameter range: 70mm~1800mm

Width size range: 50mm~460mm

Four Row Tapered Roller Bearings: Combine the inherent high-load, radial/thrust capacity and direct/indirect mounting variables of tapered roller bearings into assemblies of maximum load rating in a minimal space.

Four row (Type 380000): Features higher load-carrying capacity and is primarily used in heavy machinery, such as rolling mills.

Inner diameter size range: 130mm~1600mm

Outer diameter size range: 200mm~2000mm

Width size range: 150mm~1150mm

Common Models

32206  30×62×21.25  Agricultural machinery wheel hubs, small speed reducers

32208  40×80×24.75  Automotive wheel hubs, general-purpose speed reducers

32210  50×90×24.75  Construction machinery, speed reducers

32212  60×110×29.75  Crane wheels, mining machinery

32214  70×125×33.25  Heavy-duty speed reducers, crusher auxiliary shafts

32216  80×140×35.25  Mining machinery, metallurgical equipment

32218  90×160×42.5  Large gearboxes, conveyors

32220  100×180×49  Heavy-duty speed reducers, rolling mill auxiliary rolls

32222  110×200×56  Mining equipment, hoisting machinery

32224  120×215×61.5  Metallurgical equipment, large conveyors

Common Suffixes

J: Pressed steel cage (standard)

P5 / P4: Precision class

C3 / C4: Large internal clearance (commonly used for heavy-duty/shock-load conditions) C3

W33: Outer ring with lubrication groove and oil holes

K: Tapered bore design

Q: Brass cage; suitable for large sizes or shock-load conditions

Application Scenarios

Industrial Gearboxes: The 32200 series is standard for heavy-duty gear reducers; sizes 32208 through 32220 cover the vast majority of small-to-medium reducers, with a wide-series design that withstands the significant radial forces generated by gear meshing.

Mining Machinery: Crusher auxiliary shafts, vibrating screens, and conveyor drive rollers; involves heavy loads and some impact, where the long rollers of the 32200 series provide superior shock resistance.

Hoisting and Transport: Crane wheel assemblies, drum shafts, and travel mechanisms for port machinery; sizes 32212 through 32224 are commonly used.

Construction Machinery: Excavator travel mechanisms, loader wheel hubs, and bulldozer undercarriages; sizes 32210 through 32218 are common models.

Metallurgical Equipment: Rolling mill auxiliary rolls, conveyor roller tables, and continuous casting machine segments; suitable for medium-to-heavy load applications.

Relationship with the 30200 Series

The 32200 series can be viewed as a direct, widened upgrade of the 30200 series. Taking the 30208 (40×80×19.75) and 32208 (40×80×24.75) as examples: the outer diameters are identical, but the width increases by 5 mm, resulting in an approximately 50% increase in load-carrying capacity. When the 30200 series lacks sufficient load capacity but the outer diameter space cannot be increased, switching to the 32200 series offers the most convenient upgrade path, as no modifications to the housing bore dimensions are required.

Selection Recommendations

The 32200 series is suitable for medium-to-heavy load conditions characterized primarily by radial loads and moderate axial forces. Choose the 30200 series for greater cost-efficiency under lighter loads; upgrade to the 32300 series for severe impacts or extremely heavy loads; and consider the 33100 or 33200 series if axial forces are high.