SNR UCF206 30 mm 108x108 mm - Square Flange Bearing Unit

SNR UCF206 30 mm 108x108 mm - Square Flange Bearing Unit

SNR UCF206 is a complete self-aligning square flange bearing unit manufactured under the SNR brand of the NTN Group, designed for a 30 mm shaft. It consists of an F206 cast iron four-bolt flange housing and a UC206G2 insert ball bearing secured to the shaft by set screws. The housing measures 108x108 mm, with mounting hole spacing of 83x83 mm. The bearing insert features a spherical outer ring and a sealing arrangement with an additional flinger.

Technical Specifications - SNR UCF206

Important: UCF206 identifies the complete mounted bearing unit. UC206G2 identifies the bearing insert, while F206 identifies the housing alone.

The dynamic and static load ratings refer to the UC206G2 bearing insert. They do not represent the maximum permissible load of the complete cast iron housing, mounting bolts or supporting machine structure.

What Does SNR UCF206 Mean?

UC - Insert Ball Bearing with Set Screw Locking

UC identifies an insert ball bearing series designed for installation in compatible bearing housings.

The UC206G2 bearing insert has a cylindrical 30 mm bore and is secured directly to the shaft using set screws.

Its spherical outer ring fits into the corresponding spherical seat of the housing.

This construction allows limited angular adjustment during installation.

F - Square Flange Housing

F identifies a square flange housing with four mounting holes.

The F206 housing is manufactured from grey cast iron.

Its external dimensions are 108x108 mm, and the mounting hole centre spacing is 83x83 mm.

The four-bolt mounting arrangement allows the bearing unit to be attached to a suitable machine surface.

206 - Bearing Unit Size

The number 206 identifies the dimensional size of the bearing unit.

For UCF206, the nominal shaft diameter is 30 mm.

The designation also identifies the corresponding housing and bearing insert combination: F206 housing and UC206G2 insert.

G2 - SNR Bearing Insert Version

G2 is part of the complete UC206G2 bearing insert designation.

It should not automatically be interpreted as C3 internal clearance, a particular grease specification or a precision class.

The suffix must be retained when identifying or ordering the replacement bearing insert.

SNR - NTN Group Brand

SNR is a brand within the NTN Group, a manufacturer of rolling bearings, bearing inserts, bearing housings and complete mounted bearing units.

Alternative Designations and Reference Numbers

The product may appear in technical catalogues, distributor listings and purchasing enquiries under the following written forms:

• SNR UCF206

• UCF206 SNR

• UCF 206 SNR

• SNR UCF 206

• NTN-SNR UCF206

• UCF206 30 mm

• UCF206 108x108 mm

• SNR UCF206 flange bearing unit

• UCF206 square flange bearing

• UCF206 four-bolt flange bearing unit

Related component designations:

• F206 - cast iron square flange housing only.

• UC206G2 - insert ball bearing only.

• UCF206 - complete bearing unit containing the housing and insert.

A related NTN designation is UCF206D1, which uses a UC206D1 bearing insert.

Before using an alternative manufacturer's version, verify its exact construction, dimensions and operating specifications.

Construction and Operating Principle of SNR UCF206

F206 Square Cast Iron Housing

The F206 housing is manufactured from grey cast iron and features a square mounting flange.

Four mounting holes allow the complete bearing unit to be attached to the machine structure.

Each side of the housing measures 108 mm.

The mounting hole centre spacing is 83 mm in both directions, forming an 83x83 mm bolt pattern.

The mounting hole diameter is 12 mm.

The housing transfers forces from the bearing insert to the supporting machine structure.

Its suitability depends on the applied loads, mounting arrangement and strength of the supporting surface.

UC206G2 Insert Ball Bearing

The UCF206 unit incorporates a UC206G2 insert ball bearing.

It is a single-row ball bearing with a cylindrical 30 mm bore and a spherical outer ring.

The inner ring width is 38.1 mm.

The bearing is secured to the shaft using set screws.

The spherical outer ring allows the insert to fit into the corresponding seat of the F206 housing.

Self-Aligning Bearing Arrangement

The spherical outer ring surface works with the matching spherical housing seat.

This allows the insert to adjust its angular position during installation and helps accommodate small initial shaft alignment errors.

However, the self-aligning feature does not permit unrestricted operating misalignment.

Permissible alignment depends on the bearing unit design, sealing arrangement and operating conditions.

Sealing Arrangement with Flinger

The UC206G2 bearing insert used in the UCF206 unit features a sealing arrangement with an additional flinger.

The flinger helps reduce the entry of contaminants into the sealing area.

This arrangement supports lubricant retention and helps protect the rolling elements and raceways.

However, it should not be considered completely resistant to high-pressure washing, aggressive chemicals or severe abrasive contamination without application-specific verification.

Shaft Locking by Set Screws

The UC206G2 bearing insert is secured to a nominal 30 mm shaft using set screws located in its inner ring.

The manufacturer's recommended set screw tightening torque is 5.5 Nm.

Correct locking requires a suitable shaft diameter, appropriate shaft surface condition and proper installation.

Grease Fitting and Lubrication

The UCF206 bearing unit has a grease fitting connection with an M6x1 thread.

This allows maintenance of the bearing lubrication system according to the manufacturer's recommendations.

Lubricant selection and relubrication intervals should reflect operating temperature, load, rotational speed and contamination conditions.

Load Ratings of SNR UCF206

Basic Dynamic Load Rating C - 19.5 kN

The basic dynamic load rating of the UC206G2 bearing insert is 19.5 kN.

This value is used when calculating bearing fatigue life under operating loads.

It does not independently define the maximum permissible load of the complete square flange bearing unit.

Basic Static Load Rating C0 - 11.2 kN

The basic static load rating of the insert is 11.2 kN.

This parameter is used to evaluate loads that may cause permanent deformation at the contact points between the balls and raceways.

When designing the mounting arrangement, the strength of the housing, mounting bolts and supporting structure must also be considered.

SNR UCF206 vs Other Bearing Unit Variants

UCF206 vs UC206G2

UCF206 is a complete square flange bearing unit containing an F206 housing and a UC206G2 bearing insert.

UC206G2 is the individual insert ball bearing.

If only the insert requires replacement, the housing condition and compatibility with the new bearing must be checked.

UCF206 vs F206

F206 identifies the cast iron square flange housing without the bearing insert.

It does not include UC206G2.

UCF206 identifies the complete bearing unit containing both components.

UCF206 vs UCF205

UCF205 is a smaller square flange bearing unit.

These bearing units are not directly interchangeable.

UCF206 vs UCF207

UCF207 is a larger square flange bearing unit.

The standard UCF207 is designed for a 35 mm shaft, with housing dimensions of 117x117 mm and mounting hole spacing of 92x92 mm.

It is not a direct replacement for UCF206.

UCF206 vs UCFL206

UCF206 has a square flange housing with four mounting holes.

UCFL206 has an oval flange housing with two mounting holes.

Although both bearing units can be configured for the same nominal shaft diameter, their mounting geometries are different.

They are not directly interchangeable without checking the machine mounting arrangement.

Selection and Interchangeability of SNR UCF206

Before ordering, verify the following:

1. Complete manufacturer designation UCF206.

2. Manufacturer and required bearing unit version.

3. Nominal shaft diameter of 30 mm.

4. Square housing configuration.

5. External housing dimensions of 108x108 mm.

6. Mounting hole spacing of 83x83 mm.

7. Mounting hole diameter of 12 mm.

8. Housing body thickness of 31 mm.

9. Overall projection from the mounting surface of 40.2 mm.

10. UC206G2 bearing insert designation.

11. Set screw shaft locking arrangement.

12. Bearing sealing configuration.

13. Required internal clearance.

14. Radial and axial operating loads.

15. Rotational speed.

16. Operating temperature.

17. Lubrication conditions.

18. Strength of the supporting structure and mounting bolts.

Can UCF206 Be Replaced by a Bearing Unit from Another Manufacturer?

Square flange bearing units designated UCF206 are available from different manufacturers.

However, an identical size designation does not automatically guarantee complete technical compatibility.

The housing geometry, mounting hole pattern, bearing position relative to the mounting surface, insert construction, seals and operating specifications must be compared.

A matching 30 mm shaft diameter alone is not sufficient to confirm interchangeability.

Applications of SNR UCF206

UCF-series bearing units are designed to support rotating shafts in machinery requiring flange-mounted bearing arrangements.

Typical applications of this bearing unit construction include:

• Industrial conveyor systems.

• Material handling equipment.

• Production machinery.

• Rotating shafts supported by flange-mounted bearing units.

• Equipment requiring four-bolt bearing housing attachment.

• Machines designed to use replaceable insert ball bearings.

These are typical applications of UCF-series bearing units, not a verified list of specific machine models originally equipped with SNR UCF206.

Suitability for an individual application must be confirmed against operating loads, shaft speed, mounting geometry and environmental conditions.

Installation and Operating Recommendations

Mounting Surface Preparation

The surface supporting the flange housing should be clean, flat and sufficiently rigid.

Uneven mounting surfaces may introduce unwanted stresses into the housing and negatively affect bearing operation.

Housing Installation

Secure the bearing unit using the four mounting holes in the square flange.

The mounting holes have a diameter of 12 mm and centre spacing of 83x83 mm.

Mounting bolts and tightening torque should be selected according to the machine design and installation requirements.

Shaft Installation

The shaft should have a nominal diameter of 30 mm.

Before installation, inspect the shaft surface and remove burrs, contamination and corrosion.

Tighten the bearing insert set screws according to the manufacturer's recommendation, using a torque of 5.5 Nm.

Shaft Alignment

The spherical outer ring allows limited angular adjustment during installation.

This feature should not be used to compensate for major machine geometry errors or excessive shaft misalignment.

Lubrication

The bearing unit has an M6x1 grease fitting connection.

Lubrication should follow the manufacturer's recommendations and the actual operating conditions.

Do not introduce an incompatible lubricant without checking its suitability.

Operating Inspection

During service, inspect:

• Bearing temperature.

• Noise and vibration.

• Seal condition.

• Shaft locking stability.

• Housing mounting bolt tightness.

• Lubrication condition.

• Signs of corrosion or housing damage.

Storage

Store the bearing unit in a clean, dry environment, preferably in its original packaging.

Protect mounting surfaces, bearing seals and rolling elements against moisture, dust and mechanical damage.

Frequently Asked Questions - SNR UCF206

What are the dimensions of SNR UCF206?

The bearing unit is designed for a 30 mm shaft. The square housing measures 108x108 mm, with mounting hole centre spacing of 83x83 mm. The mounting holes have a diameter of 12 mm, and the overall projection from the mounting surface is 40.2 mm.

What does UCF206 mean?

UC identifies an insert ball bearing with set screw shaft locking. F identifies a square flange housing, and 206 specifies the bearing unit size designed for a nominal 30 mm shaft.

Which bearing insert is used in SNR UCF206?

The unit incorporates an SNR UC206G2 insert ball bearing with a 30 mm bore and a 62 mm outside diameter.

Does UCF206 Include Both the Housing and Bearing?

Yes. UCF206 is a complete mounted bearing unit containing an F206 cast iron housing and a UC206G2 insert ball bearing.

How Is UCF206 Mounted to a Machine?

The unit is attached through four mounting holes in the square flange housing. The hole spacing is 83x83 mm, and the hole diameter is 12 mm.

How Is the Shaft Secured in UCF206?

The 30 mm shaft is secured using set screws located in the inner ring of the UC206G2 insert. The recommended tightening torque is 5.5 Nm.

What Are the Load Ratings of SNR UCF206?

The UC206G2 bearing insert has a basic dynamic load rating of 19.5 kN and a basic static load rating of 11.2 kN. These values do not define the maximum permissible load of the complete unit, including the housing and mounting bolts.

Are UCF206 and UCFL206 Interchangeable?

Not without checking the mounting geometry. UCF206 uses a square four-bolt housing, while UCFL206 uses an oval two-bolt housing.

SNR UCF206 - Key Technical Information

SNR UCF206 is a complete self-aligning square flange bearing unit for a 30 mm shaft, manufactured under the SNR brand of the NTN Group. It combines an F206 cast iron housing measuring 108x108 mm with a UC206G2 insert secured by set screws. The four mounting holes have 83x83 mm spacing. The insert's basic dynamic load rating is 19.5 kN, and its static rating is 11.2 kN.

SNR UCF206 at simmering.pl

SNR UCF206 is offered by simmering.pl, a specialist supplier of rolling bearings, insert ball bearings, bearing housings and complete mounted bearing units.

We serve machinery manufacturers, industrial maintenance departments, mechanical repair workshops and B2B purchasing teams.

Our warehouse and order processing operations are located in Lublin, Poland. We supply customers throughout Europe and offer worldwide shipping.