UCP vs UCF vs UCFL: Choosing Between Pillow Block and Flange Bearing Units

UCP, UCF and UCFL units may use related insert-bearing technology, but their housings solve different mounting problems. The quickest way to choose among them is to look at the machine surface: does the support sit on a base below the shaft, or does it bolt to a vertical or side face?

That mounting decision determines which dimensions must be controlled in the drawing and which replacement measurements matter most.

EP-UCP: two-bolt pillow block

EP-UCP is a base-mounted housing. The shaft runs parallel to the support surface, so centre height H, base length L and bolt spacing J are primary interface dimensions. UCP is the natural choice for many horizontal conveyor shafts, agricultural drives, rollers and general machinery frames.

EP-UCF: four-bolt square flange

EP-UCF mounts to a machine face with four bolts around the shaft. A flange unit is useful where a separate base beneath the shaft is inconvenient or where the shaft projects through a side plate. For replacement, measure flange width/height, bolt pitch and projection in addition to bore.

EP-UCFL: two-bolt oval flange

EP-UCFL uses a narrower two-bolt flange, reducing the mounting-face footprint where a four-bolt square casting would occupy too much space. It still requires the shaft bore, two-hole spacing and front-to-back projection to match the machine.

Where EP-UCFC fits

Round flange cartridge units provide another face-mounted option where a circular housing shape and more concentric cartridge-style geometry suit the machine. They are frequently considered for pump, fan or equipment housings where the support is built around the shaft centre rather than a floor base.

Mounting-orientation decision guide

Do not replace by bore alone

A 25 mm bore can appear in several housing families, but those units do not share the same bolt pattern, centre height or outside envelope. For a retrofit, photograph the complete housing and record the mounting dimensions before choosing the new family.

If the machine designer has freedom to choose a new housing type, compare service access too: grease fitting location, ability to remove the insert, nearby guards and tool access can be as important as nominal housing weight.

Mounting orientation is the fastest first filter

Machine interface	Housing family to review	Reason
Horizontal base under shaft	EP-UCP	Two-bolt foot supports a shaft parallel to the base
Square side plate / four holes	EP-UCF	Four-bolt face mounting
Compact side plate / two holes	EP-UCFL	Oval two-bolt face mounting
Round machined face	EP-UCFC	Cartridge-style circular housing
Compact bracket on one side	EP-UCFB-style housing	Use only when the bracket geometry matches

Housing choice does not replace insert selection

After the housing style is chosen, the insert still has to match the shaft and duty. Bore, locking method, insert width, sealing and lubrication remain separate checks. This is why “UCF instead of UCP” is not only a change in bolt pattern: it can also change shaft projection, tool access and how the support reacts to the frame.

Replacement measurements

For a base-mounted UCP, record bore, centre height and base bolt spacing. For UCF or UCFL, record bore plus horizontal/vertical or two-hole pitch, flange envelope and any pilot. For UCFC, include the circular housing diameter and register. Those measurements make the selection independent of a possibly incomplete old part number.

Need a model checked against your machine? Send the dimensions with your RFQ.