MTM 33111 55x95x30 - Single-Row Tapered Roller Bearing

MTM 33111 55x95x30 - Single-Row Tapered Roller Bearing

MTM 33111 is a single-row tapered roller bearing with dimensions 55x95x30 mm, designed to accommodate combined radial and axial loads. The tapered raceways and tapered rollers provide a large effective contact area, making the 33111 suitable for loaded shaft arrangements in gearboxes, drive systems, agricultural machinery and industrial equipment. The bearing has a 55 mm bore, 95 mm outside diameter and 30 mm overall width.

Technical Specifications - MTM 33111

Manufacturer: MTM
Designation: 33111
Product type: Tapered roller bearing
Design: Single row
Dimension series: 331
Bore diameter d: 55 mm
Outside diameter D: 95 mm
Overall width T: 30 mm
Inner ring width B: 30 mm
Outer ring width C: 23 mm
Rolling elements: Tapered rollers
Bore: Cylindrical
Construction: Separable
Design: Open
Primary loads: Radial and axial
Axial load direction: One direction for a single bearing

Dimensions 55x95x30 mm

The principal dimensions of MTM 33111 are:

d: 55 mm
D: 95 mm
T: 30 mm
B: 30 mm
C: 23 mm

The 30 mm dimension represents the overall bearing width T. The outer ring width C is 23 mm.

The 55x95x30 mm dimensions are characteristic of the 33111 designation and are important when identifying a replacement for an existing tapered roller bearing.

Tapered Roller Bearing Construction

MTM 33111 consists of two separable main components:

Cone: inner ring with tapered rollers and cage
Cup: separate outer ring

The tapered geometry of the rollers and raceways enables the bearing to support radial forces and axial forces simultaneously.

The separable construction also simplifies installation because the cup and cone assembly can be mounted independently.

Combined Radial and Axial Loads

A major characteristic of the 33111 tapered roller bearing is its ability to accommodate combined loading.

A single bearing can support:

Radial loads
Axial loads in one direction

The axial load-carrying capability results directly from the contact angle created by the tapered roller and raceway geometry.

For applications where axial forces act in both directions, two tapered roller bearings can be installed in an opposed arrangement.

Bearing Clearance and Preload

Tapered roller bearing arrangements allow the operating clearance or preload to be adjusted during assembly.

Correct adjustment is important for:

• shaft rigidity
• accurate shaft guidance
• operating temperature
• running accuracy
• load distribution
• bearing service life

Excessive preload can increase friction and operating temperature, while excessive clearance can reduce the rigidity and accuracy of the bearing arrangement.

Compact 331 Series Design

The 331 series combines tapered roller bearing load capability with relatively compact radial dimensions.

The 33111 has a 55 mm bore and only 95 mm outside diameter, making it useful where a tapered roller bearing is required but radial installation space is restricted.

This dimensional characteristic also distinguishes the 33111 from other tapered roller bearing series designed for the same 55 mm shaft diameter.

Separable Bearing Design

The inner ring, tapered roller set and cage form one assembly, while the outer ring can be removed separately.

This separability provides practical advantages during:

• machine assembly
• bearing installation
• shaft servicing
• maintenance
• replacement operations

The cup and cone should always correspond to the correct 33111 bearing specification.

Typical Applications

MTM 33111 can be used in appropriately designed:

• industrial gearboxes
• reduction gears
• transmission systems
• machine shafts
• agricultural machinery
• material handling equipment
• industrial drive systems
• production machinery

Final selection should consider actual radial and axial loads, rotational speed, lubrication, operating temperature and the required bearing adjustment.

Replacement Identification - MTM 33111

When identifying a replacement, verify:

Brand: MTM
Designation: 33111
Bearing type: Single-row tapered roller bearing
Dimensions: 55x95x30 mm
Bore d: 55 mm
Outside diameter D: 95 mm
Overall width T: 30 mm
Inner ring width B: 30 mm
Outer ring width C: 23 mm

The designation 33111 is used by multiple bearing manufacturers for the same standardized boundary dimensions.

However, load ratings, limiting speeds, cage execution and other manufacturer-specific technical parameters should be verified when replacing a bearing in a demanding application.

33111 vs 32211

The 33111 and 32211 are not dimensionally identical, even though both are tapered roller bearings for a 55 mm shaft.

33111: 55x95x30 mm
32211: 55x100x26.75 mm

The 33111 has a smaller outside diameter but greater overall width. Therefore, the two designations should not be treated as direct replacements without redesigning or verifying the complete bearing arrangement.

FAQ - MTM 33111

What are the dimensions of MTM 33111?
The principal dimensions are 55x95x30 mm: 55 mm bore, 95 mm outside diameter and 30 mm overall width.

What type of bearing is MTM 33111?
It is a single-row tapered roller bearing.

Can MTM 33111 carry axial loads?
Yes. A single 33111 bearing can accommodate axial load in one direction together with radial load.

Can 33111 support radial loads?
Yes. Tapered roller geometry provides substantial radial load-carrying capability.

Is MTM 33111 a separable bearing?
Yes. The outer ring can be separated from the inner ring, roller and cage assembly.

What is the outer ring width of 33111?
The outer ring width C is 23 mm, while the overall bearing width T is 30 mm.

Can 33111 bearings be installed in pairs?
Yes. Opposed tapered roller bearings can support axial loads in both directions and allow adjustment of bearing clearance or preload.

Is 33111 interchangeable with 32211?
No. Their dimensions differ. The 33111 measures 55x95x30 mm, while the 32211 measures 55x100x26.75 mm.