Product Introduction

The 33100 series tapered Roller Bearings feature a "wide series" design with a medium contact angle (approximately 20° to 25°). Characterized by a moderate outer diameter and greater width, they offer balanced radial and axial load-carrying capacities with a focus on heavy loads. These bearings are specialized models designed for the travel mechanisms of construction machinery and for heavy-duty gearboxes.

The 33100 series single row Tapered Roller Bearings carry the diameter series code "31" and feature a medium contact angle of approximately 20° to 25°. They are positioned as "wide-series, medium-angle, heavy-load" bearings: they are wider and offer higher load capacity than the 32000 series, while providing a smaller contact angle and superior radial load capacity compared to the 33200 series, making them a balanced, heavy-duty choice situated between the two.

Single row Tapered Roller Bearings are among the most widely used rolling bearings in industry. They consist of 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 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 are capable of simultaneously supporting radial loads and unidirectional axial loads; typically, they are installed in opposing pairs to provide axial location in both directions. They find extensive application in sectors such as automotive manufacturing, construction machinery, mining, and speed reducers. 

Key Features

Balanced Heavy-Duty Design with Medium Contact Angle: A contact angle of 20° to 25° balances radial and axial load capacities; the wide profile accommodates longer rollers, resulting in high overall load-bearing capability.

Moderate Outer Diameter: Sized between the 32000 series and the 32200/32300 series, making it suitable for medium-sized housing bores.

Optimized for Construction Machinery: Extensively used in travel drives and slewing mechanisms.

Excellent Shock Resistance: The combination of long rollers and a medium contact angle handles the complex loading conditions typical of construction machinery.

Dimensional Specifications

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 Suffixes

J: Pressed steel cage

C: Contact angle variant (used by some manufacturers)

P5 / P4: Precision class

C3 / C4: Large internal clearance (C3 is standard for construction machinery)

W33: Outer ring with lubrication groove and oil holes

Q: Brass cage (for large sizes or high-impact applications)

Quick Reference for Common Models

33110  50×85×26  Small construction machinery, gear reducers

33112  60×100×30  Crane wheels, gearboxes

33114  70×120×37  Excavator travel drives

33116  80×130×37  Loader wheel hubs, mining machinery

33118  90×150×45  Heavy-duty gear reducers, conveyors

33120  100×165×52  Metallurgical equipment, large gearboxes

33124  120×200×62  Mining machinery, rolling mill auxiliary rolls

33130  150×250×80  Large gear reducers, shield tunneling machines

Application Scenarios

Construction Machinery: The 33100 series is a primary choice for the travel drives and slewing mechanisms of excavators, loaders, and bulldozers. The medium contact angle design effectively manages the combined radial and axial loads encountered during operation; models ranging from 33112 to 33120 are the most commonly used. Hoisting and Transport: Crane wheel assemblies, drum shafts, and travel mechanisms for port machinery; the wide series offers high load-carrying capacity, with sizes 33114 through 33124 being commonly used.

Mining Machinery: Crusher auxiliary shafts, conveyor drive rollers, and hoist main shafts; applications involving heavy loads and significant axial forces.

Industrial Gearboxes: Heavy-duty speed reducers and helical gear shafts; the medium contact angle accommodates axial force components generated by gear meshing.

Metallurgical Equipment: Rolling mill auxiliary rollers, straighteners, and continuous casting machine segments; applications involving medium-to-heavy loads.

Comparison with the 32000 and 33200 Series

The 33100 series sits between the 32000 series (medium contact angle, narrow series) and the 33200 series (large contact angle, wide series). Comparing the 33116 (80×130×37) with the 32016X (80×125×29) and 33216 (80×140×46): the 33100 series has an outer diameter 5 mm larger and a width 8 mm greater than the 32000 series, offering higher load capacity; compared to the 33200 series, it has an outer diameter 10 mm smaller and a width 9 mm smaller, yet features a smaller contact angle, resulting in superior radial load capacity. The core positioning of the 33100 series is a balanced heavy-duty design combining a "medium contact angle" with a "wide series" profile.

Selection Recommendations

The 33100 series is suitable for operating conditions involving medium-to-heavy loads, balanced radial and axial forces, and moderate space for the outer diameter—particularly for the travel mechanisms of construction machinery. Choose the 32000 series if outer diameter space is limited; choose the 33200 series if axial forces are extremely high; and choose the 32200 or 32300 series for applications involving purely heavy radial loads.