Product Introduction

The 32300 series tapered Roller Bearings stand out as the heavyweights of the single-row Tapered Roller Bearing family. Characterized by large outer diameters, substantial widths, and the longest rollers, they offer the highest radial and axial load-carrying capacities among standard contact-angle series. They are specifically engineered for demanding applications involving heavy loads and severe impacts, such as crushers and vibrating screens.

Designated by the diameter series code "23" and featuring a contact angle of approximately 12° to 15°, the 32300 series represents the largest and most robust option within the standard small-angle series. Combining a large outer diameter with significant width and superior roller length, these bearings are the ideal solution for handling extreme loads and shock forces.

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, a cup-shaped outer ring with a tapered raceway, and a single row of tapered rollers positioned between them. The geometry is designed so that the apexes of the tapered surfaces converge at a single point on the bearing axis, ensuring pure rolling motion. As separable bearings, the inner ring assembly and outer ring can be mounted independently. They accommodate both radial and unidirectional axial loads and are typically installed in opposing pairs to provide axial location in both directions. They find extensive application in sectors such as automotive, construction machinery, mining, and gear reducers.

Unique Positioning

The load-carrying capacity of the 32300 series is unrivaled among standard-angle series. A comparison between the 32310 (50×110×42.25) and the 30210 (50×90×21.75) illustrates this: for the same inner diameter, the 32310 features an outer diameter that is 20mm larger and a width nearly double that of the 30210, resulting in an approximately 80% increase in radial load capacity. These bearings serve as the "last line of defense" in the single-row tapered roller bearing category—when the 32200 series falls short of load requirements, the 32300 series stands as the ultimate choice within the standard-angle range. 

Key Characteristics

Highest load-carrying capacity: For a given inner diameter, these bearings feature the largest outer diameter and width, as well as the longest rollers; radial load capacity is approximately 1.5 to 2 times that of the 30200 series.

Excellent shock resistance: Long rollers and a large contact area effectively distribute impact loads.

Large width and weight: They occupy significant axial space and are unsuitable for compact designs.

Lower limiting speed: Large rollers generate significant frictional heat; suitable for medium-to-low speed, heavy-load applications.

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

32306  30×72×28.75  Heavy-duty agricultural machinery, small crushers

32308  40×90×35.25  Undercarriage mechanisms for construction machinery

32310  50×110×42.25  Heavy-duty vehicle axles, mining machinery

32312  60×130×48.5  Crushers, vibrating screens

32314  70×150×54  Rolling mills, heavy-duty gearboxes

32316  80×170×61.5  Mining crushers, conveyors

32318  90×190×67.5  Metallurgical equipment, heavy-duty cranes

32320  100×215×77.5  Large crushers, rolling mills

32324  120×260×90.5  Heavy-duty mining equipment, shield tunneling machines

Application Scenarios

Mining Crushing: The 32300 series is the preferred bearing choice for the main shafts and eccentric shafts of jaw crushers and cone crushers; the long rollers provide reliable load support under heavy impact loads. Models 32312 through 32324 are the most common.

Vibrating Screens and Feeders: Used for vibrating screen exciter shafts and feeder drive shafts subject to continuous impact and vibration; the 32300 series is typically used with C3 (large) internal clearance. Metallurgical Rolling: Mill auxiliary rolls, straighteners, and large conveyor roller tables; suitable for heavy-load, medium-to-low speed applications.

Construction Machinery: Final drives for heavy bulldozers, travel mechanisms for excavators, and wheel hubs for large loaders; sizes 32308 through 32316 are commonly used.

Heavy-Duty Vehicles: Axles for mining dump trucks and drive axles for heavy-duty tractors; suitable for extreme heavy-load operating conditions.

Common Suffixes

J: Pressed steel cage

D / B: Designation used by some manufacturers for large contact angle variants (e.g., 32300D has a contact angle of approx. 20° to 30°)

C3 / C4: Increased internal clearance; C3 or C4 is mandatory for crushers and vibrating screens

P5 / P4: Precision class

W33: Outer ring with lubrication groove and oil holes

Q / M: Brass cage; suitable for large sizes and high-impact conditions

Selection Recommendations

The 32300 series is suitable for operating conditions involving extremely heavy radial loads, strong impacts, and medium-to-low speeds. For moderate loads, the 32200 series is more economical; for high axial forces requiring a steep contact angle, consider the 33200 series; if the 32300 series is insufficient, upgrade to double-row or four-row tapered roller bearings.