Product Categories / Mounted Bearings / Pillow Block Bearing / UCP208

UCP208

Name: UCP208 Pillow Block Bearing
Brand: LILY

$10.78 /Each

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Overview
Part Number	UCP208
Brand: LILY	Interchangeable With: AMI
Bearing Part Number	UC208
Housing Part Number	P208T
Characteristics
System of Measurement	Metric
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	1/8-27 NPT
Dimensions
Bore Dia	40 mm
Bore Dia Tolerance	-0.0005" to 0"
Bearing Width	49.2 mm
Hole Width	17 mm
Hole Length	25 mm
Overall Height	100 mm
Pillow Height	19 mm
Center Height	49.2 mm
Whole Length	184 mm
Hole Ctr-to-Ctr Min	124 mm
Hole Ctr-to-Ctr Max	149 mm
Width of Inner Ring	54 mm
Mounting Bolt Size	M14
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	2.02 kg

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What does UCP208 mean?

UCP208 is an AMI metric cast iron pillow block unit with a wide inner ring insert and set screw locking, for a 40 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 UC208

P: Housing style: cast iron pillow block. Housing part number is P208T

2: 200 series (normal duty)

08: Bore code: 08 × 5 = 40 mm

Note: For metric mounted bearings, the bore is usually the bore code × 5 mm. Codes 00, 01, 02 and 03 are the exceptions: 10, 12, 15 and 17 mm.

Frequently asked questions

What does UCP208 mean?

UCP208 is an AMI metric cast iron pillow block unit with a wide inner ring insert and set screw locking, for a 40 mm shaft. UC = wide inner ring ball bearing insert, set screw locking, spherical outer ring. Insert part number is UC208, P = housing style: cast iron pillow block. Housing part number is P208T, 2 = 200 series (normal duty), 08 = bore code: 08 × 5 = 40 mm.

What is the bore size of UCP208?

The bore of UCP208 is 40 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 M14 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. A less common transitional size between M12 and M16, used where the standard M12 falls marginally short of the required clamping force without necessitating the larger footprint of an M16 housing.

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 M14 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. An M14 bolt corresponds to a transitional hole pattern between M12 and M16, used where standard M12 falls marginally short of the required clamping force, 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.