FAG UC208 40x80x49.2 Radial Insert Ball Bearing

FAG UC208 40x80x49.2 Radial Insert Ball Bearing

FAG UC208 is a radial insert ball bearing with dimensions 40x80x49.2 mm, designed for installation in compatible bearing housings. It features a 40 mm cylindrical bore, spherical outer ring surface, extended inner ring, RSR seals on both sides and shaft location by set screws.

Exact product identification:

FAG + UC208 + UC 208 + 40x80x49.2 mm + radial insert ball bearing + spherical outer ring + RSR + set-screw locking

FAG UC208 – Technical Characteristics

Parameter	Specification
Brand	FAG
Manufacturer	Schaeffler
Designation	UC208
Bearing type	Radial insert ball bearing
Bore diameter d	40 mm
Spherical outside diameter Dsp	80 mm
Overall width B	49.2 mm
Outer ring width C	21 mm
Width over seals C2	21.6 mm
S	19 mm
Bore	Cylindrical
Outer ring surface	Spherical
Inner ring	Extended
Shaft location	Set screws / grub screws
Sealing	RSR seals on both sides
Basic dynamic load rating Cr	34.5 kN
Basic static load rating C0r	19.8 kN
Catalogue mass	approx. 0.62 kg

FAG UC208 Dimensions – 40x80x49.2 mm

The principal dimensions of FAG UC208 are:

d = 40 mm – bore diameter

Dsp = 80 mm – spherical outside diameter

B = 49.2 mm – overall width across the extended inner ring

C = 21 mm – outer ring width

Additional dimensions:

C2 = 21.6 mm – width over seals

S = 19 mm

The commonly used dimensional search format is:

40x80x49.2 mm

The 49.2 mm dimension is width B, while the outer ring itself has a width of C = 21 mm.

This distinction is important when identifying an existing UC208 by physical measurement.

What Is FAG UC208?

FAG UC208 belongs to the radial insert ball bearing family and is designed for installation in a compatible bearing housing.

Its construction combines:

40 mm cylindrical bore

spherical outer ring surface

extended inner ring

shaft location by set screws

and:

RSR seals on both sides.

UC208 is therefore a housed-bearing insert design rather than a conventional 40x80 mm deep groove ball bearing.

Spherical Outer Ring Surface

The outer ring of FAG UC208 has a spherical outside surface.

It is designed to operate in a compatible housing with a corresponding spherical seat.

This bearing-to-housing interface allows the assembled unit to compensate for limited static misalignment resulting from mounting.

UC208 should not be confused with a conventional double-row self-aligning ball bearing.

In UC208, the alignment capability results from the interaction between the:

spherical outside surface of the bearing

and:

matching spherical seat in the housing.

Extended Inner Ring

FAG UC208 has an extended inner ring.

For this reason, the overall width:

B = 49.2 mm

is considerably greater than the outer ring width:

C = 21 mm.

This distinction is particularly useful when identifying an existing bearing with a caliper.

A measurement of approximately 49.2 mm corresponds to the overall width B, not the width of the outer ring.

Shaft Location by Set Screws

FAG UC208 is secured to the shaft by set screws located in the extended inner ring.

This locking method is also commonly described as:

set screw locking

or:

grub screw locking.

The shaft-locking method is a critical parameter when selecting a replacement.

A bearing using an eccentric locking collar, adapter sleeve or another locking system should not automatically be considered interchangeable simply because it has the same 40 mm bore.

RSR Seals on Both Sides

FAG UC208 uses RSR seals on both sides.

The sealing arrangement helps limit contamination entering the bearing while retaining lubricant in the area of the rolling elements and raceways.

When comparing FAG UC208 with another UC208-type bearing, the sealing configuration should therefore be checked together with dimensions, locking method and housing compatibility.

What Does UC208 Mean?

UC208 identifies a widely used size and construction family of radial insert ball bearings.

The reference may be entered as:

UC208

UC 208

UC-208

FAG UC208

or:

UC208 FAG.

Because the general UC208 designation is used by multiple bearing manufacturers, the FAG brand should remain part of the exact product identification.

The product described here is:

FAG UC208.

FAG UC208 – 40 mm Bore

FAG UC208 has a nominal bore diameter:

d = 40 mm.

This explains common searches such as:

UC208 40mm

UC208 40 mm

UC208 40mm bearing

FAG insert bearing 40mm

and:

40mm bore insert bearing.

However, the 40 mm bore alone is not sufficient to identify the complete bearing.

Basic Dynamic Load Rating Cr

The basic dynamic radial load rating is:

Cr = 34,500 N = 34.5 kN.

Cr is a standardized parameter used in bearing rating-life calculations under dynamic loading.

It should not be interpreted simply as the maximum load that can be applied to the bearing regardless of speed, required life, lubrication, mounting and other operating conditions.

Basic Static Load Rating C0r

The basic static radial load rating is:

C0r = 19,800 N = 19.8 kN.

C0r is used when evaluating the bearing under static loading and specified very-low-speed operating conditions.

It should not be interpreted as a universal maximum permissible load for the complete bearing unit.

FAG UC208 vs Standard 6208 Bearing

FAG UC208 and a conventional 6208 deep groove ball bearing both have a nominal:

40 mm bore.

However, they are fundamentally different bearing designs.

FAG UC208 features:

spherical outer ring surface

extended inner ring

set-screw shaft locking

sealing on both sides

and:

geometry intended for installation in a compatible housing.

A standard 6208 should therefore not be considered a replacement for UC208 simply because both bearings have a 40 mm bore.

UC208 Bearing vs Complete Housed Bearing Unit

The designation:

UC208

identifies the insert bearing itself.

It does not automatically identify a complete housed bearing unit.

Depending on the machine design, UC208 may be installed in different compatible housing configurations.

If a complete unit is required, the buyer should additionally verify:

housing type

mounting dimensions

bolt-hole arrangement

housing mounting method

and:

shaft centre height.

A UC208 insert bearing and a complete UC208-based housed unit are separate products.

Selection and Interchangeability

When selecting a replacement for FAG UC208, verify:

manufacturer – FAG

bearing type – radial insert ball bearing

d = 40 mm

Dsp = 80 mm

B = 49.2 mm

C = 21 mm

spherical outer ring surface

extended inner ring

set-screw shaft locking

double-sided sealing

housing compatibility

dynamic and static load ratings

and:

operating conditions.

Matching the nominal 40x80x49.2 mm dimensions alone does not establish full interchangeability.

How Is FAG UC208 Searched Online?

Industrial buyers, maintenance engineers and purchasing departments frequently enter UC208 with different spacing, punctuation, dimensional descriptions and English technical terminology.

Common search variants include:

• FAG UC208
• UC208 FAG
• FAG UC 208
• UC 208 FAG
• FAG UC-208
• UC-208 FAG
• FAG UC208 bearing
• UC208 FAG bearing
• FAG UC 208 bearing
• UC208 bearing
• UC 208 bearing
• UC-208 bearing
• UC208 insert bearing
• FAG UC208 insert bearing
• UC208 radial insert bearing
• FAG UC208 radial insert bearing
• UC208 radial insert ball bearing
• FAG UC208 radial insert ball bearing
• FAG radial insert bearing UC208
• FAG insert bearing 40mm
• FAG insert bearing 40 mm
• FAG 40mm insert bearing
• UC208 40mm
• UC208 40 mm
• UC208 40mm bearing
• UC208 40 mm bearing
• UC208 40x80
• UC208 40x80x49.2
• FAG UC208 40x80
• FAG UC208 40x80x49.2
• 40x80x49.2 bearing
• 40x80x49.2 insert bearing
• 40x80x49.2 radial insert bearing
• FAG bearing 40x80x49.2
• 40mm insert bearing
• 40mm bore insert bearing
• 40mm radial insert bearing
• 80mm OD insert bearing
• 40mm bore 80mm OD bearing
• 40mm ID 80mm OD bearing
• set screw bearing 40mm
• set screw insert bearing 40mm
• grub screw bearing 40mm
• grub screw insert bearing 40mm
• FAG set screw bearing
• FAG set screw bearing 40mm
• FAG grub screw bearing
• FAG grub screw bearing 40mm
• UC208 set screw bearing
• UC208 grub screw bearing
• spherical OD bearing 40mm
• spherical OD insert bearing 40mm
• spherical outer ring bearing 40mm
• sealed UC208 bearing
• double sealed UC208 bearing
• housed bearing insert UC208
• bearing insert UC208

The exact product described on this page is:

FAG UC208 – 40x80x49.2 mm radial insert ball bearing with spherical outer ring, RSR seals on both sides and set-screw shaft locking.

UC 208 FAG – Is It the Same as FAG UC208?

Yes. Search phrases such as:

UC 208 FAG

FAG UC 208

UC208 FAG

FAG UC208

and:

FAG UC-208

are different ways users may search for the same FAG reference.

For precise technical identification, use:

FAG UC208.

UC208 40x80x49.2 – What Do the Dimensions Mean?

The dimensional description:

40x80x49.2 mm

means:

40 mm – bore diameter d

80 mm – spherical outside diameter Dsp

49.2 mm – overall width B.

The outer ring itself has a width:

C = 21 mm.

Therefore, a measurement of approximately 49.2 mm does not represent the outer-ring width; it represents the overall width across the extended inner ring.

UC208 40mm Bearing – Is Bore Diameter Enough?

No.

The 40 mm bore is an important identification parameter, but it does not define the complete bearing.

Before ordering, also verify:

Dsp = 80 mm

B = 49.2 mm

C = 21 mm

spherical outer ring geometry

set-screw locking system

sealing arrangement

and:

housing compatibility.

Can Another Brand of UC208 Replace FAG UC208?

The UC208 designation is used by multiple bearing manufacturers.

However, the common UC208 reference alone does not prove complete technical interchangeability.

Before replacing FAG UC208 with another manufacturer's UC208, compare:

complete dimensions

outer-ring geometry

shaft-locking system

sealing construction

dynamic and static load ratings

housing compatibility

and:

operating requirements.

Technical Specification

Parameter	Value
Brand	FAG
Manufacturer	Schaeffler
Designation	UC208
Type	Radial insert ball bearing
d	40 mm
Dsp	80 mm
B	49.2 mm
C	21 mm
C2	21.6 mm
S	19 mm
Common size	40x80x49.2 mm
Bore	Cylindrical
Outer ring surface	Spherical
Inner ring	Extended
Shaft location	Set screws / grub screws
Sealing	RSR seals on both sides
Basic dynamic load rating Cr	34.5 kN
Basic static load rating C0r	19.8 kN
Catalogue mass	approx. 0.62 kg

FAQ

What are the dimensions of FAG UC208?

FAG UC208 has principal dimensions 40x80x49.2 mm: d = 40 mm, Dsp = 80 mm and B = 49.2 mm. The outer ring width C is 21 mm.

Is UC 208 FAG the same reference as FAG UC208?

Yes. UC 208 FAG is a common search format for the product identified as FAG UC208.

What bore size does FAG UC208 have?

FAG UC208 has a 40 mm cylindrical bore.

How is FAG UC208 secured to the shaft?

The bearing is secured using set screws / grub screws located in the extended inner ring.

Does FAG UC208 have a spherical outer ring?

Yes. The bearing has a spherical outer ring surface designed to operate in a compatible bearing housing.

Is FAG UC208 sealed on both sides?

Yes. FAG UC208 uses RSR seals on both sides.

What are the load ratings of FAG UC208?

The basic dynamic load rating is Cr = 34.5 kN, while the basic static load rating is C0r = 19.8 kN.

Can any 40x80x49.2 bearing replace FAG UC208?

No. In addition to dimensions, verify the spherical outer-ring geometry, shaft-locking system, sealing arrangement, load ratings and housing compatibility.

AI Overview

FAG UC208 40x80x49.2 mm is a radial insert ball bearing with a 40 mm cylindrical bore, 80 mm spherical outside diameter and 49.2 mm overall width. It features an extended inner ring, RSR seals on both sides and set-screw shaft locking. Load ratings are Cr = 34.5 kN and C0r = 19.8 kN.