UCF SERIES 300 REINFORCED BEARINGS WITH 4-HOLE SQUARE FLANGE

Reinforced UCF Series 300 Bearings with 4-Hole Square Flange

TheUCF Series 300 Bearings are complete bearing assemblies designed for applications requiring a robust flanged bearing, high load capacity, and a rigid mounting on the machine.

They consist of asquare cast-iron housing with four holes and aUC Series 300 Insert Bearing mounted in a spherical mount that allows for self-alignment.

The UCF300 series is part of a more robust product line than the UCF200 series. For the same shaft diameter, the housing and bearing are generally larger and offer a higher load capacity. Manufacturers' catalogs commonly refer to the UCF300 series as a reinforced or “heavy-duty” series.

The products offered by Camagris are marketed under the brand nameCredits.

Camagris currently offers two products in this category:

UCF305 – shaft, Ø25 mm

UCF308 – shaft, Ø40 mm. 

What is a UCF300 bearing ?

An UCF300 bearing assembly is a ready-to-install unit consisting of two main components:

a square cast-iron housing from the F300 series ;

a UC300 insert bearing.

The housing has four mounting holes located at the four corners of the flange.

The bearing has a spherical outer ring that can rotate slightly within its housing. This design compensates for minor static misalignment between the shaft and the machine.

The inner ring of the bearing is wide and is secured directly to the shaft usingtwo set screws.

The UCF300 series is therefore particularly well-suited when you need an assembly that is easy to install, robust, and capable of supporting higher loads than a standard compact bearing.

Components of a UCF Series 300 Bearing

A UCF300 bearing assembly typically consists of:

• a square, four-hole cast-iron housing ;
• a UC Series 300 insert bearing ;
• a spherical outer ring ;
• a wide inner ring ;
• two set screws for securing it to the shaft ;
• protective seals on both sides ;
• a lubrication system that allows for relubrication ;
• four mounting holes on the housing.

The NTN, SNR, NSK, and PTI technical manuals confirm this design, which features a cast iron housing and a screw-mounted UC insert.

UCF305 – Reinforced Bearing for Ø25 mm Shaft

TheUCF305 is intended for a shaft25 mm.

Its main dimensions are:

Inner diameter d:25 mm

External dimensions of the housing: approximately110 mm

Center-to-center distance between the four mounting points:80 mm

Thickness of housing g / A1:13 mm

Body width:29 mm

Diameter of the mounting holes:16 mm

Total width of the set: approximately39 mm

Width of the bearing's inner ring:38 mm

Corresponding insert:UC305

Matching housing:F305

Common mounting bolts:M14

The Camagris technical data sheet lists the following dimensions: d = 25 mm, a = 110 mm, e = 80 mm, g = 13 mm, l = 29 mm, s = 16 mm, and Z = 39 mm.

Official NTN and SNR data also specify that the UCF305 has a center-to-center distance of 80 mm, an insert width of 38 mm, and an F305 housing.

UCF308 – Reinforced Bearing for Ø40 mm Shaft

TheUCF308 is intended for a shaft40 mm.

Its main dimensions are:

Inner diameter d:40 mm

External dimensions of the housing:150 mm

Center-to-center distance between the four mounting points:112 mm

Thickness of housing g:17 mm

Body width:40 mm

Diameter of the mounting holes:19 mm

Total width Z:56 mm

Width of the bearing's inner ring: approximately52 mm

Corresponding insert:UC308

Matching housing:F308

Common mounting bolts:M16

These ratings correspond to those currently listed on the Camagris UCF308 data sheet.They also correspond to the dimensional tables for the UCF300 series.

What is the difference between the UCF 200 Series and the UCF 300 Series ?

This is probably the most important issue to address in this category.

TheThe UCF200 and UCF300 are not interchangeable simply because they have the same inner diameter.

For example:

Both the UCF205 and the UCF305 are designed for a 25-mm shaft ;

But the UCF305 has a significantly larger bearing and housing.

The UCF200 series is the standard line used in a very large number of conveyors, screw conveyors, agricultural machinery, and industrial equipment.

The UCF300 series features a more robust design intended for applications requiring greater load capacity and a more substantial housing.

So, for a 25-mm shaft:

UCF205 = Standard 200 Series

UCF305 = Reinforced 300 Series

For a 40-mm shaft:

UCF208 = Standard 200 Series

UCF308 = Reinforced 300 Series

Before replacing an UCF200 with an UCF300, or vice versa, you must check all the dimensions of the housing.

Why choose an UCF300 over an UCF200 ?

A more robust design

The 300 series uses larger insert bearings and housings.

This design is best suited for situations where the assembly is subjected to higher loads.

A wider inner ring

The UC300 bearing generally has an inner ring that is significantly wider than that of its UC200 counterpart.

This provides an additional support surface on the shaft.

A more solid cast-iron housing

The F300 housing is larger than that of the F200 series.

This design increases the stiffness of the support.

Four mounting points

The four holes in the bracket help distribute the forces across the machine's structure.

Simple mounting on a cylindrical shaft

No tapered sleeve is required on the standard UC version: the two set screws secure the inner ring directly to the shaft.

How do I choose a UCF Series 300 bearing ?

The shaft diameter is the first criterion, but it is not enough.

Check the inner diameter

The UCF305 corresponds to a 25 mm shaft.

The UCF306 normally corresponds to a 30-mm shaft.

The UCF307 is equivalent to 35 mm.

The UCF308 corresponds to 40 mm.

The UCF309 corresponds to 45 mm.

The UCF310 corresponds to 50 mm.

And the lineup continues with larger sizes.

The UCF300 series is therefore available in many sizes, although Camagris currently offers mainly the UCF305 and UCF308 models in this category. The manufacturers’ catalogs list a range extending from the UCF305 to much larger sizes.

Check the center-to-center distance between the four fasteners

This is a key figure.

UCF305:80 mm

UCF308:112 mm

If the center-to-center distance of the existing bearing does not match, the new housing will not be able to use the machine's existing drill holes.

Check the diameter of the holes

UCF305: approximately16 mm

UCF308: approximately19 mm

This dimension determines, among other things, the diameter of the bolts used.

Check the thickness and dimensions

You should also measure:

the available depth behind the housing ;

the width of the inner ring ;

the available clearance between the bearing and the other components ;

enough space to access the grease fitting.

Agricultural Applications of UCF300 Bearings

The UCF300 series may be a good choice for agricultural equipment subjected to heavy loads or for which a Series 200 bearing is insufficient.

In particular, it can be used on:

heavy-duty conveyors ;

Grain elevators ;

high-capacity grain augers ;

screw ;

conveyor shafts ;

mixers ;

vending machines ;

Spreaders ;

agricultural machinery transmissions ;

large fans ;

shredders ;

Storage equipment ;

material-handling equipment ;

heavily loaded intermediate trees.

Agricultural bearings are frequently exposed to dust, moisture, vibrations, and shocks. Specialized manufacturers therefore recommend tailoring the housing's strength, sealing, and lubrication to the specific application.

How does the auto-alignment feature of a UCF300 work ?

The cast-iron housing should not be confused with the bearing itself.

The interior of the housing features a spherical seat in which the outer ring of the insert bearing is positioned.

The bearing can therefore pivot slightly within the housing.

This feature compensates for minor static misalignments caused by, for example:

a slightly warped frame ;

a difference in position between two supports ;

an assembly error ;

a slight bending of the structure.

However, self-alignment should not be used to correct a severely bent shaft or a major installation error.

How is the UCF300 mounted on the shaft ?

InsertsUC300 use a set screw fastening system.

Once the bearing is in place and aligned, the screws in the inner ring are tightened against the shaft.

The system allows for easy installation without a clamping sleeve.

It is nevertheless important that the tree have the following characteristics:

the correct diameter ;

a clean surface ;

adequate cylindricity ;

the absence of significant burrs.

A bearing race that is too worn may prevent the screws from holding the bearing securely in place.

Comparisons Between Major Brands

The DesignationUCF300 is widely adopted by manufacturers of bearings and bushing assemblies.

These include, among others:

NTN: UCF305D1, UCF306D1, UCF307D1, UCF308D1…

SNR: UCF305, UCF306, UCF307, UCF308…

NSK: UCF305D1 and related series

FYH: UCF305, UCF306, UCF307, UCF308…

AMI / Asahi: UCF305, UCF308…

NTN officially describes the UCF3 series as a square, cast-iron flanged unit with screw-mounted bearings.

For example, SNR provides theUCF305 such as the assembly consisting of the bearingUC305G2 and housingF305. 

NSK, for its part, offers theUCF305D1, consisting of a UC305D1 insert and an F305D1 housing.

For the 300 series, you need to be more careful with SKF equivalents: standard interchange tables do not always provide a direct SKF equivalent for the UCF305 and UCF300, unlike the UCF200.

So it's best to keepUCF305 / UCF308 as the primary references rather than coming up with an approximate SKF equivalent.

What is the difference between the UCF300 and the UCP300 ?

Both families can use a UC300 insert, but the housing is completely different.

TheUCF300 has a square housing with four holes.

TheUCP300 has a base designed to be bolted to a surface parallel to the shaft.

The choice therefore depends on the type of mounting available on the machine.

What is the difference between UCF300 and UCFL ?

The UCFL is an oval flange with two holes, typically built around a UC Series 200 insert.

The UCF300 features a four-hole square flange and a much more robust construction.

They therefore meet a wide variety of editing needs.

Sealing of UCF300 Bearings

The insert bearing is equipped with seals designed to retain grease and limit the entry of contaminants.

In an agricultural application, the bearing may be exposed to:

Dust ;

plant residues ;

To moisture ;

Mud ;

when washing ;

fertilizers or corrosive substances.

Depending on the conditions, specific versions with enhanced sealing may be preferable.

Agricultural equipment manufacturers offer, among other things, multi-lip technologies for heavily contaminated environments.

Lubrication and Maintenance of a UCF300 Bearing

Standard UCF300 bearings are generally relubricatable.

The grease fitting allows grease to be injected into the bearing at regular intervals.

The frequency of lubrication depends on:

rotational speed ;

temperature ;

of the load ;

the level of contamination ;

the number of operating hours ;

the type of grease.

On farm machinery operating in dusty conditions, it may be necessary to inspect the bearing more frequently.

Excess grease should also be avoided, as it can cause the temperature to rise and lead to seal failure.

Installation Tips

Before installation, thoroughly clean the shaft and the mounting surface.

Place the bearing on the shaft.

Install the four bolts without tightening them completely.

If two bearings support the same shaft, align the two bearing seats.

Check that the shaft turns freely.

Gradually tighten the four bolts on the flange.

Next, tighten the set screws on the inner ring.

After a few hours of operation, check for overheating, abnormal vibration, and loose parts.

Frequently Asked Questions About UCF 300 Series Bearings

What does UCF305 mean ?

UC refers to a bearing insert with a wide inner ring and set screw fastening.

"F" refers to the four-hole square-flange housing.

3 indicates the 300 reinforced series.

05 corresponds here to a shaft diameter of25 mm.

What is the inner diameter of a UCF305 ?

The UCF305 has a metric bore of25 mm.

What are the dimensions of a UCF305 ?

Its main dimensions are approximately:

110 mm on each side ;

80 mm center-to-center distance ;

16 mm for the holes ;

39 mm total width ;

38 mm inner ring width.

What is the inside diameter of a UCF308 ?

The UCF308 is designed for a shaft of40 mm.

What are the dimensions of a UCF308 ?

The Camagris product information sheet states:

150 mm outer diameter ;

112 mm center-to-center distance ;

17 mm flange thickness ;

19 mm for the mounting holes ;

56 mm total width.

What is the difference between UCF205 and UCF305 ?

They both have a 25-mm bore, but theThe UCF305 is significantly more robust and larger.

Therefore, you should never directly replace an UCF205 with an UCF305 without checking the dimensions of the mounting hole.

What is the difference between UCF208 and UCF308 ?

Both are designed for a 40-mm shaft.

However, the UCF308 belongs to the reinforced 300 series and has a much larger housing and insert.

Is the bearing included with the housing ?

Yes. A complete UCF bearing assembly consists of the housing and its insert bearing.

Can you replace just the bearing ?

Yes, as long as the cast-iron housing remains in good condition. For a UCF305, the corresponding insert is aUC305. For an UCF308, this is aUC308.

Is the UCF300 suitable for agriculture ?

Yes, especially when the application requires a sturdy square housing, a high load-carrying capacity, and a rigid mounting. The choice of sealing and lubrication frequency must be adapted to the actual operating conditions.

Order a UCF Series 300 Bearing from Camagris

Camagris currently offers theUCF305 and UCF308, both listed with 24-hour shipping in that category.

To select the right bearing, first check the following:

the shaft diameter ;

the center-to-center distance between the four mounting points ;

the exterior dimensions of the dwelling ;

the diameter of the holes ;

the thickness of the substrate ;

the total width of the bearing.

If you're unsure whether to choose a Series 200 UCF or a Series 300 UCF, don't rely solely on the shaft diameter:Be sure to compare all the dimensions of the property.

An important recommendation for this category

Here, unlike the UCF200 or UCP200 categories,Another SEO issue is the number of products. The UCF300 series includes, at a minimum, the UCF305, 306, 307, 308, 309, 310, 311, 312, etc., whereas your category currently offers only two models.

Once the SEO work on the categories is complete, I'll take a serious look at whether your vendor can offer you at leastUCF306, UCF307, UCF309, and UCF310. This would allow this category to become a true product line page and capture many more specific searches.