Product Categories / Mounted Bearings / Pillow Block Bearing / UGPU309

UGPU309

Name: UGPU309 Pillow Block Bearing
Brand: LILY

$50.02 /Each

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Overview
Part Number	UGPU309
Brand: LILY	Interchangeable With: AMI
Bearing Part Number	UG309
Housing Part Number	P-U309
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	Eccentric Collar Locking
Product Series	UGPU300
Lubrication Fitting Tap	1/8-27 NPT
Dimensions
Bore Dia	45 mm
Bore Dia Tolerance	-0.0005" to 0"
Hole Width	16 mm
Hole Length	28.5 mm
Overall Height	143 mm
Pillow Height	33.3 mm
Center Height	73 mm
Whole Length	261 mm
Hole Ctr-to-Ctr Min	194 mm
Hole Ctr-to-Ctr Max	225 mm
Width of Inner Ring	76 mm
Width with Eccentric Collar	58.7 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	4.7 kg

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What does UGPU309 mean?

UGPU309 is an AMI metric cast iron pillow block unit with a wide inner ring insert and eccentric collar locking, for a 45 mm shaft. The part number breaks down into 4 segments:

UG: Wide inner ring ball bearing insert, eccentric collar locking, spherical outer ring. Insert part number is UG309

PU: Housing style: cast iron pillow block. Housing part number is P-U309

3: 300 series (heavy duty)

09: Bore code: 09 × 5 = 45 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 UGPU309 mean?

UGPU309 is an AMI metric cast iron pillow block unit with a wide inner ring insert and eccentric collar locking, for a 45 mm shaft. UG = wide inner ring ball bearing insert, eccentric collar locking, spherical outer ring. Insert part number is UG309, PU = housing style: cast iron pillow block. Housing part number is P-U309, 3 = 300 series (heavy duty), 09 = bore code: 09 × 5 = 45 mm.

What is the bore size of UGPU309?

The bore of UGPU309 is 45 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 eccentric collar locking in this pillow block bearing unit, which secures the shaft reliably against moderate loads and intermittent vibration — provided the collar is rotated firmly in the direction of shaft rotation and the locking screw is fully tightened — 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 Eccentric Collar Locking to secure the shaft?

Eccentric collar locking works by rotating an offset collar in the direction of shaft rotation until it clamps firmly around the shaft, which makes it well suited to applications where the shaft surface must remain undamaged and load distribution needs to be more even. Its main advantage over other shaft locking methods is a broader contact area that reduces shaft stress, which matters most when the application involves intermittent loads, frequent starts and stops, or softer shaft materials.

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.