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UCP204-12

Name: UCP204-12 Pillow Block Bearing
Brand: LILY
Price: 10.72 USD
Availability: InStock

$10.72 /Each

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Overview
Part Number	UCP204-12
Brand: LILY	Interchangeable With: AMI
Bearing Part Number	UC204-12
Housing Part Number	P204T
Characteristics
System of Measurement	Inch
Bearing Type	Ball Bearing
Bearing Seal Type	Double Sealed
Inner Ring Type	Wide Inner Ring
Mounted Type	Pillow Block Bearing
Shaft Mount Type	Set Screw Locking
Product Series	UCP200
Lubrication Fitting Tap	1/4-28 UNF
Dimensions
Bore Dia	0.75"
Bore Dia Tolerance	-0.0005" to 0"
Bearing Width	1.22"
Hole Width	0.5"
Hole Length	0.75"
Overall Height	2.5625"
Pillow Height	0.5938"
Center Height	1.3125"
Whole Length	5"
Hole Ctr-to-Ctr Min	3.375"
Hole Ctr-to-Ctr Max	4.125"
Width of Inner Ring	1.5"
Mounting Bolt Size	0.375"
Material
Bearings Material	AISI 52100 Steel
Housing Material	Cast Iron
Performance
Temperature Range	-30° to 110 °C
Properties
RoHS	Compliant
REACH	Compliant
Lubrication	Required
Weight	1.43 lbs

UCP204-12 Pillow Block Bearing data sheet

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What does UCP204-12 mean?

UCP204-12 is an AMI inch cast iron pillow block unit with a wide inner ring insert and set screw locking, for a 3/4" (19.05 mm) shaft. The part number breaks down into 4 segments:

UC: Wide inner ring ball bearing insert, set screw locking, spherical outer ring. Insert part number is UC204-12

P: Housing style: cast iron pillow block. Housing part number is P204T

204: Frame size 204, 200 series (normal duty)

-12: Bore in sixteenths of an inch: 12/16" = 3/4" (19.05 mm)

Note: For inch mounted bearings, the number after the dash is the bore in sixteenths of an inch. For example, -8 is 1/2", -12 is 3/4" and -16 is 1".

Frequently asked questions

What does UCP204-12 mean?

UCP204-12 is an AMI inch cast iron pillow block unit with a wide inner ring insert and set screw locking, for a 3/4" (19.05 mm) shaft. UC = wide inner ring ball bearing insert, set screw locking, spherical outer ring. Insert part number is UC204-12, P = housing style: cast iron pillow block. Housing part number is P204T, 204 = frame size 204, 200 series (normal duty), -12 = bore in sixteenths of an inch: 12/16" = 3/4" (19.05 mm).

What is the bore size of UCP204-12?

The bore of UCP204-12 is 3/4" (19.05 mm).

The housing of pillow block bearing, crafted from iron, is engineered to withstand heavy-load and high-vibration conditions with the structural rigidity and dimensional stability needed to keep the overall mounted bearing assembly performing reliably over the long term.

Shaft retention is achieved through set screw locking in this pillow block bearing unit, which secures the shaft reliably against moderate loads and low-to-medium vibration — provided the shaft is of standard ground finish and the screws are correctly torqued — without damaging the shaft surface.

Two 0.375 inch bolts fasten the mounted bearing unit to the mounting surface, providing a secure and stable foundation that suits both new installations and direct replacement applications. This size is among the most common in light-to-medium duty inch-series pillow blocks, offering a practical balance between holding strength and compact housing dimensions.

Why choose Iron for the bearing housing?

Because this pillow block bearing is specifically designed for heavy-load and high-vibration conditions, cast iron delivers superior rigidity and dimensional stability where lighter or polymer housings are prone to deformation under load, making it a purpose-built choice for this application rather than a generic substitute.

Why does this bearing use Set Screw Locking to secure the shaft?

Set screw locking works by tightening one or two hardened screws directly against the shaft surface, which makes it well suited to applications where shaft positioning is fixed and loads are moderate. Its main advantage over other shaft locking methods is simplicity and low cost, which matters most when quick installation and minimal tooling are the priority.

How does the 0.375 inch affect installation and compatibility?

The bolt size directly determines whether the pillow block bearing can be mounted onto an existing frame or structure without modification. A 0.375 inch bolt corresponds to one of the most widely used hole patterns in light-to-medium duty inch-series pillow blocks, so when replacing an existing unit, confirming this dimension ensures a drop-in fit. Mismatched bolt sizes may require redrilling the mounting surface or sourcing an adapter plate, adding time and cost to the installation.