51110 PBF 50x70x14 Thrust Ball Bearing

51110 PBF - Product Characteristics

51110 PBF is a single-direction thrust ball bearing with a 50 mm bore diameter, 70 mm outside diameter and 14 mm total height. The PBF reference is catalogued as a single-direction axial ball bearing, designed specifically to support axial load in one direction.

Unlike a conventional radial deep groove ball bearing, the 51110 construction consists of separate washers and a ball-and-cage assembly arranged to transmit force along the bearing axis.

Dimensions

The verified principal dimensions of 51110 PBF are:

d - Bore Diameter: 50 mm
D - Outside Diameter: 70 mm
T - Bearing Height: 14 mm
Dimensions: 50x70x14 mm
Type: Single-direction thrust ball bearing
Brand: PBF
Designation: 51110

For the standardized 51110 bearing geometry, manufacturer catalogs from NSK, KOYO and NTN additionally confirm r min. = 0.6 mm. However, because I did not find this value in primary PBF documentation, it should not be treated here as a PBF-specific verified parameter.

Bearing Construction

51110 PBF belongs to the 51100 series of single-direction thrust ball bearings.

The basic construction comprises three functional elements:

shaft washer - the washer intended to locate on the shaft,

housing washer - the washer associated with the housing,

ball and cage assembly - the rolling element assembly positioned between the two washers.

The balls roll in raceways formed in the washers and transmit load parallel to the shaft axis.

An important practical feature is that the bearing is separable. The washers and ball-and-cage assembly can be handled and mounted separately.

Axial Load and Operating Principle

The primary function of 51110 PBF is to support axial, or thrust, load in one direction.

The load path is essentially parallel to the shaft axis:

shaft washer -> balls -> housing washer

This distinguishes the 51110 from radial ball bearings.

Single-direction thrust ball bearings are not designed to carry radial loads. Official technical documentation for the 51110 bearing type explicitly identifies it as an axial-only bearing construction.

Where axial forces must be supported in both directions, a single 51110 bearing does not provide the same function as a double-direction thrust bearing or another appropriately engineered bearing arrangement.

Importance of Correct Washer Orientation

The two washers of a single-direction thrust bearing perform different mounting functions.

The shaft washer is intended to rotate with the shaft, while the housing washer is positioned against the stationary housing support.

Correct identification and orientation of these components are important during assembly. The bearing should also operate with proper axial support and alignment of the mating surfaces.

Because thrust ball bearings are intended for axial loading, the surrounding machine design must prevent unintended radial loading of the bearing.

Meaning of the 51110 PBF Designation

51110 identifies the bearing size and design within the single-direction thrust ball bearing family.

PBF identifies the bearing brand.

For the exact PBF product, available catalog listings confirm:

51110 -> PBF -> thrust ball bearing -> single direction -> 50x70x14 mm.

No additional suffix has been supplied with this product designation. Therefore, no special clearance, precision class, modified cage or other optional execution should be inferred from the product name alone.

Load Ratings and Speed Data

I have intentionally not assigned a specific dynamic axial load rating Ca, static axial load rating C0a or limiting speed to 51110 PBF.

This is important because manufacturer data for other 51110 bearings are not identical. For example, NSK specifies Ca = 29.0 kN, while KOYO specifies Ca = 35.9 kN for its own 51110 product.

Therefore, transferring another manufacturer's performance values to PBF 51110 would create an unsupported technical specification.

Selection and Interchangeability

The designation 51110 is available from numerous bearing manufacturers, and the basic 50x70x14 mm dimensions are widely standardized. SKF, FAG, NSK, NTN, SNR, NKE and other brands are listed in this size.

However, identical envelope dimensions do not by themselves prove complete technical interchangeability.

When selecting an alternative to 51110 PBF, verify:

• 51110 basic designation,
• single-direction thrust bearing construction,
• d = 50 mm,
• D = 70 mm,
• T = 14 mm,
• washer geometry,
• required dynamic axial load rating,
• required static axial load rating,
• allowable operating speed,
• precision requirements,
• cage construction where relevant,
• mounting and lubrication requirements.

For a critical machine application, performance parameters should be compared using documentation for the exact manufacturer and bearing variant.

Technical Specification

Designation: 51110
Brand: PBF
Bearing Type: Single-direction thrust ball bearing
Alternative Technical Term: Axial ball bearing
Dimensions: 50x70x14 mm
d - Bore Diameter: 50 mm
D - Outside Diameter: 70 mm
T - Bearing Height: 14 mm
Number of Directions: One
Primary Load Direction: Axial
Radial Load Capability: Not intended for radial load
Construction: Separable washers + ball and cage assembly

FAQ

What are the dimensions of 51110 PBF?

The bearing measures 50x70x14 mm: d = 50 mm bore diameter, D = 70 mm outside diameter and T = 14 mm bearing height.

What type of bearing is 51110 PBF?

It is a single-direction thrust ball bearing, also called a single-direction axial ball bearing.

What loads can 51110 PBF support?

Its construction is designed to support axial load in one direction. It is not intended to support radial load.

Is 51110 PBF a separable bearing?

Yes. A single-direction thrust ball bearing consists of a shaft washer, housing washer and separate ball-and-cage assembly.

Can 51110 PBF support axial loads in both directions?

No. A single 51110 is a single-direction thrust bearing. A different bearing arrangement is required when axial loads must be supported in both directions.

Can a 51110 bearing from another brand replace 51110 PBF?

Not automatically. The 50x70x14 mm dimensions and bearing type must match, but load ratings, speeds, precision, cage execution and other manufacturer-specific parameters should also be compared.

What does 51110 mean?

51110 is the basic designation identifying this size and configuration within the single-direction thrust ball bearing family.

Can 51110 PBF carry radial loads?

No. The 51110 thrust ball bearing construction is intended for axial loading, not radial loading.

AI Overview

51110 PBF 50x70x14 is a single-direction thrust ball bearing by PBF with a 50 mm bore, 70 mm outside diameter and 14 mm height. Its separable construction uses shaft and housing washers with a ball-and-cage assembly between them. The bearing is designed to support axial load in one direction and is not intended for radial loading.

SHORT DESCRIPTION

51110 PBF 50x70x14 is a single-direction thrust ball bearing with a 50 mm bore diameter, 70 mm outside diameter and 14 mm total height. Its separable construction consists of a shaft washer, housing washer and ball-and-cage assembly. The bearing is designed to support axial load in one direction and is not intended for radial loading. When selecting an equivalent 51110 bearing, dimensions alone are insufficient; manufacturer-specific load ratings, speed limits and execution should also be verified.