Product Introduction

The 33200 series consists of heavy-duty, wide-profile single row tapered Roller Bearings featuring a steep contact angle (approximately 28° to 32°). Among all single-row series, this series offers the highest axial load-carrying capacity; its wide profile also ensures outstanding radial load capacity, making it specifically designed for mining equipment and heavy-duty axial load applications.

Bearing the diameter series code "32" and a contact angle of approximately 28° to 32°, the 33200 series stands out as the single row Tapered Roller Bearing series with the steepest contact angle and the highest axial load capacity. By combining a steep contact angle with a wide profile, it handles immense axial forces while maintaining substantial radial load capacity, making it the ultimate choice for heavy-duty axial applications.

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, and an outer ring with a cup-shaped tapered raceway, with a single row of tapered rollers positioned between them. The extensions of all conical 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 accommodate both radial loads and unidirectional axial loads; typically, they are installed in opposing pairs to provide bidirectional axial location. They are widely used in sectors such as automotive, construction machinery, mining, and gear reducers.

Unique Status

The 33200 series represents the pinnacle of axial load capacity among single-row tapered roller bearings. A comparison between the 33216 (80×140×46, contact angle ~30°) and the 31316 (80×170×42.5, contact angle ~26°) reveals that the 33200 series—despite having a smaller outer diameter—features a greater width and a steeper contact angle, resulting in superior axial load capacity. When the axial load capacity of other single-row series proves insufficient, the 33200 series serves as the ultimate option; if capacity requirements still exceed this, one must upgrade to double-row or four-row tapered roller bearings. 

Key Features

Highest axial load capacity: Large contact angle (28° to 32°); axial load capacity far exceeds that of the 31300 and 32000 series.

High radial load capacity (Wide Series): Greater width and longer rollers ensure excellent radial load performance.

Lowest limiting speed: Steep cone angle and long rollers result in maximum frictional heat generation; suitable only for low-to-medium speed applications.

Highly specialized: Primarily designed for applications involving extreme axial forces, such as mining and heavy machinery.

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

33206  30×62×25  Small mining machinery, bevel gear shafts

33208  40×80×32  Construction machinery, heavy-duty gear reducers

33210  50×90×32  Mining equipment, cranes

33212  60×110×38  Crusher auxiliary shafts, gearboxes

33214  70×125×41  Metallurgical equipment, large pumps

33216  80×140×46  Mining crushers, conveyors

33218  90×160×52  Heavy-duty gear reducers, rolling mills

33220  100×180×60  Large mining equipment, shield tunneling machines

33224  120×215×76  Heavy-duty crushers, metallurgical equipment

Common Suffixes

J: Pressed steel cage

B / D: Large contact angle variant (designation varies by manufacturer)

C3 / C4: Large internal clearance; C3 or C4 is essential for heavy-duty mining applications

P5 / P4: Precision class

W33: Outer ring with lubrication groove and oil holes

Q / M: Brass cage; for large sizes and shock-load conditions

/S0: High-temperature tempering treatment

Application Scenarios

Mining machinery: 33200 This series serves as the primary bearing type for mining crushers and cone crushers; the steep contact angle design enables it to withstand the immense axial forces generated during the crushing process. Models ranging from 33212 to 33224 are the most common.

Heavy-duty gearboxes: Used for large bevel gear shafts and helical gear shafts in large speed reducers; in applications involving extremely high axial forces, the 33200 series can replace the combination of a radial bearing and a thrust bearing.

Metallurgical equipment: Rolling mill screw-down mechanisms, straighteners, and large conveyor roller tables—applications characterized by heavy loads and high axial forces.

Construction machinery: Final drives for heavy-duty bulldozers and swing mechanisms for large excavators—components subject to significant axial loads.

Petroleum and heavy machinery: Drilling equipment, heavy-duty cranes, and main drives for tunnel boring machines (TBMs)—applications involving extreme axial loads.

Selection Recommendations

The 33200 series is suitable for operating conditions involving extremely high axial loads, low-to-medium speeds, and heavy-duty service. If axial forces are moderate, the 31300 or 32000 series offers a more economical choice; for heavy loads that are purely radial, the 32300 series is appropriate; if the 33200 series still cannot meet requirements, consider upgrading to double-row tapered roller bearings.