SKF YET 204 20x47x30.5 mm - Insert Bearing with Eccentric Locking Collar

SKF YET 204 20x47x30.5 mm - Insert Bearing with Eccentric Locking Collar

SKF YET 204 is a single-row ball insert bearing with a 20 mm bore, 47 mm outside diameter and 30.5 mm overall width B1. It features a spherical outside surface, a narrow inner ring and shaft locking by means of an eccentric locking collar. The bearing is sealed on both sides and designed for relubrication.

Technical Data - SKF YET 204

What Does SKF YET 204 Mean?

The designation:

SKF YET 204

identifies a specific SKF insert bearing from the SKF Y-bearing family.

SKF is the manufacturer.

YET identifies an SKF insert bearing design using an eccentric locking collar for shaft location. The bearing has a spherical outside surface and a narrow inner ring.

204 identifies the bearing size. SKF YET 204 has a 20 mm bore and 47 mm outside diameter.

The complete designation YET 204 should be retained when ordering or identifying the product. It should not be identified simply as "204" or confused with a conventional 6204 deep groove ball bearing.

SKF YET 204 Dimensions

Principal dimensions:

20x47x30.5 mm

where:

• d = 20 mm - bore diameter
• D = 47 mm - outside diameter
• B1 = 30.5 mm - overall width

Additional dimensions:

• B = 21 mm - inner ring width
• C = 14 mm - outer ring width
• d1 = approx. 28.2 mm
• d2 = 32.4 mm
• B4 = 4.75 mm
• s1 = 23.5 mm
• r1,2 min. = 0.6 mm

For an insert bearing, specifying only the 20x47 mm bore and outside diameter is not sufficient. Overall width, ring geometry, locking method and compatibility with the bearing housing must also be considered.

SKF YET 204 Construction

SKF YET 204 is a single-row ball insert bearing designed to operate in a suitable bearing housing.

Its principal construction features include:

• inner ring with cylindrical bore,
• outer ring with spherical outside surface,
• single row of balls,
• cage guiding the rolling elements,
• seals on both sides,
• eccentric locking collar for shaft location.

The spherical outside surface is designed to mate with the corresponding spherical seating in a suitable bearing housing.

This arrangement enables the complete bearing unit to accommodate initial misalignment resulting from mounting.

It does not mean that the bearing is intended to accommodate unrestricted or continuously changing dynamic misalignment during operation.

Eccentric Locking Collar

One of the most important characteristics of SKF YET 204 is its shaft locking method.

The bearing uses an:

eccentric locking collar

The eccentric collar interacts with the corresponding eccentric extension of the bearing inner ring to secure the bearing on the shaft.

This is a key feature of the YET design and should be considered when selecting a replacement.

A 20x47 mm insert bearing using a different locking system, such as grub screws, should not automatically be considered a direct replacement for SKF YET 204.

Spherical Outside Surface

The outer ring of SKF YET 204 has a:

spherical outside surface

This is one of the main features distinguishing YET 204 from a conventional deep groove ball bearing.

The spherical outer ring surface is designed to operate in the matching spherical seating of an appropriate housing.

The combination of the insert bearing and housing enables the complete unit to compensate for initial alignment errors resulting from installation.

SKF YET 204 Sealing

SKF YET 204 is:

sealed on both sides

The seals help to:

• reduce the ingress of contaminants,
• retain lubricant around the rolling elements,
• protect the raceways and balls during operation.

The bearing construction is also designed for relubrication.

When installed in a housing, the lubrication arrangement of the complete bearing unit should be considered.

SKF YET 204 Load Ratings

SKF specifies the following values for YET 204:

C = 12.7 kN

Basic dynamic load rating.

C0 = 6.55 kN

Basic static load rating.

Pu = 0.28 kN

Fatigue load limit.

These values apply to the specific SKF YET 204 bearing and should not automatically be transferred to other 20x47 mm insert bearings.

SKF YET 204 Limiting Speed

SKF specifies:

8500 r/min

as the limiting speed with shaft tolerance:

h6

The shaft tolerance condition is technically important.

Permissible speed for insert bearings depends on factors including shaft accuracy, fit, locking arrangement and operating conditions.

Therefore, 8500 r/min should not be interpreted as a universal speed limit for every shaft fit and operating condition.

SKF YET 204 vs SKF 6204

SKF YET 204 is not the same product as a conventional SKF 6204 deep groove ball bearing.

Both products have:

• 20 mm bore diameter,
• 47 mm outside diameter.

However, their construction is fundamentally different.

SKF YET 204 is an insert bearing with:

• spherical outside surface,
• B1 overall width of 30.5 mm,
• specific inner ring geometry,
• eccentric locking collar,
• construction intended for use with a suitable bearing housing.

A conventional SKF 6204 has different geometry and a different mounting arrangement.

SKF 6204 is not a direct replacement for SKF YET 204 simply because both bearings have 20x47 mm bore and outside dimensions.

SKF YET 204 vs SKF YET 204-012

These two designations should not be confused.

SKF YET 204 has a bore of:

20 mm

In contrast:

SKF YET 204-012

is an inch-size variant with a bore of:

3/4 inch, or 19.05 mm

Both belong to the same bearing family and have a 47 mm outside diameter, but their bore diameters are different.

They are therefore not automatically interchangeable on the same shaft.

SKF YET 204 vs Other Insert Bearings

Insert bearings can have the same bore and outside diameter while differing in:

• shaft locking method,
• inner ring width,
• overall width,
• sealing arrangement,
• relubrication capability,
• load ratings,
• permissible speed,
• shaft requirements,
• compatibility with specific housings.

For this reason, replacement selection should be based on the complete designation and construction rather than the 20x47 mm dimensions alone.

Alternative Designations and Search References

Natural product reference variations include:

SKF YET 204

YET 204 SKF

YET204 SKF

SKF YET204

YET 204 20x47x30.5

SKF YET 204 20x47x30.5

SKF YET 204 insert bearing

SKF YET 204 Y-bearing

SKF YET 204 eccentric locking collar

SKF YET 204 bearing insert

Do not confuse this product with:

SKF YET 204-012

because YET 204-012 has a 19.05 mm or 3/4 inch bore.

How to Select a Replacement for SKF YET 204

Before selecting another insert bearing, verify:

• complete bearing designation,
• bore diameter d = 20 mm,
• outside diameter D = 47 mm,
• overall width B1 = 30.5 mm,
• inner ring width B = 21 mm,
• outer ring width C = 14 mm,
• spherical outside surface,
• eccentric locking collar,
• sealing arrangement,
• relubrication capability,
• required load ratings,
• rotational speed,
• shaft tolerance,
• compatibility with the existing housing.

Identical bore and outside diameters do not automatically mean complete technical interchangeability.

Typical Application of the YET Design

SKF YET 204 is an insert bearing designed for use as part of a complete bearing unit with an appropriate housing.

This type of construction is suitable where the application requires:

• convenient shaft locking,
• operation in a housing with a spherical bearing seat,
• accommodation of initial mounting misalignment,
• sealed bearing construction,
• relubrication capability.

Selection of the complete bearing unit should consider load, rotational speed, environmental conditions, shaft diameter and tolerance, and SKF technical documentation.

SKF YET 204 Installation

During installation:

• keep the bearing, shaft and housing clean,
• verify shaft diameter and tolerance,
• inspect the shaft surface,
• use a compatible bearing housing,
• correctly position and lock the eccentric collar,
• do not transmit mounting forces through the balls and raceways,
• protect the seals against damage,
• follow the SKF mounting procedure for eccentric locking collar insert bearings.

Until installation, the bearing should remain in its original packaging and be stored in a clean, dry environment.

FAQ

What are the dimensions of SKF YET 204?

The principal dimensions are 20x47x30.5 mm, where 20 mm is the bore diameter, 47 mm is the outside diameter and 30.5 mm is the overall width B1. The inner ring width B is 21 mm and the outer ring width C is 14 mm.

What type of bearing is SKF YET 204?

SKF YET 204 is a single-row ball insert bearing with a spherical outside surface, designed for installation in a suitable bearing housing.

How is SKF YET 204 locked onto the shaft?

SKF YET 204 uses an eccentric locking collar. This locking method is one of the defining construction features of the YET series.

Are SKF YET 204 and SKF 6204 the same bearing?

No. Although both have a 20 mm bore and 47 mm outside diameter, their construction is different. YET 204 is an insert bearing with a spherical outside surface and eccentric locking collar.

Are SKF YET 204 and SKF YET 204-012 interchangeable?

Not on the same shaft without considering the bore difference. SKF YET 204 has a 20 mm bore, while SKF YET 204-012 has a 3/4 inch or 19.05 mm bore.

What are the load ratings of SKF YET 204?

SKF specifies a basic dynamic load rating C = 12.7 kN, basic static load rating C0 = 6.55 kN, and fatigue load limit Pu = 0.28 kN.

What is the limiting speed of SKF YET 204?

SKF specifies a limiting speed of 8500 r/min with an h6 shaft tolerance. The shaft tolerance condition should be considered when evaluating permissible operating speed.

Is SKF YET 204 sealed?

Yes. SKF YET 204 is sealed on both sides and its construction allows relubrication.

SKF YET 204 - Quick Answer

SKF YET 204 is a single-row ball insert bearing measuring 20x47x30.5 mm, with a spherical outside surface and shaft locking by an eccentric locking collar. It is sealed on both sides and designed for relubrication. SKF specifies C = 12.7 kN, C0 = 6.55 kN and a limiting speed of 8500 r/min with an h6 shaft tolerance.

Available from simmering.pl, a specialist B2B supplier of bearings and technical sealing solutions for industry, maintenance departments and technical service companies. Stock in Poland with worldwide shipping.