UGSAO311-35

UGSAO311-35 Pillow Block Bearing
$230.70 /Each    info

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Overview

Part Number UGSAO311-35
Brand: LILY Brand: LILY Interchangeable With: AMI
Bearing Part Number UG311-35
Housing Part Number SAO311
Product Series UGSAO300

Characteristics

System of Measurement Inch
Housing Style Pillow Block Bearing
Bearing Type Ball Bearing
Bearing Duty Heavy Duty
Expansion Type Non-Expansion Bearing (Fixed)
Bore Type Round
Inner Ring Type Wide Inner Ring
Shaft Mount Type Eccentric Collar Locking
Bearing Seal Type Double Sealed
Number of Mounting Holes 2

Dimensions

Shaft Diameter 2.1875"
Bore Dia 2.1875"
Width of Inner Ring 3.5"
Whole Length 12.5938"
Overall Height 6.7031"
Center Height 3.75"
Pillow Height 1.4063"
Mounting Bolt Size 0.75"
Hole Ctr-to-Ctr Min 9.5"
Hole Ctr-to-Ctr Max 11"
Bore Dia Tolerance -0.0005" to 0"
Base Width 3.5 "
Hole Length 1.375"
Hole Width 0.875"
Width with Eccentric Collar 2.874"

Material

Bearings Material AISI 52100 Steel
Housing Material Cast Iron

Performance

Dynamic Radial Load 16100 lbf
Static Radial Load 10100 lbf
Temperature Range -30° to 110 °C

Properties

Lubrication Required
Lubrication Fitting Tap 1/8-27 NPT
RoHS Compliant
REACH Compliant
Weight 19.72 lbs

What does UGSAO311-35 mean?

UGSAO311-35 is an AMI inch cast iron pillow block unit with a wide inner ring insert and eccentric collar locking, for a 2 3/16" (55.56 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 UG311-35
SAO
Housing style: cast iron pillow block. Housing part number is SAO311
311
Frame size 311, 300 series (heavy duty)
-35
Bore in sixteenths of an inch: 35/16" = 2 3/16" (55.56 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 UGSAO311-35 mean?

UGSAO311-35 is an AMI inch cast iron pillow block unit with a wide inner ring insert and eccentric collar locking, for a 2 3/16" (55.56 mm) shaft. UG = wide inner ring ball bearing insert, eccentric collar locking, spherical outer ring. Insert part number is UG311-35, SAO = housing style: cast iron pillow block. Housing part number is SAO311, 311 = frame size 311, 300 series (heavy duty), -35 = bore in sixteenths of an inch: 35/16" = 2 3/16" (55.56 mm).

What is the bore size of UGSAO311-35?

The bore of UGSAO311-35 is 2 3/16" (55.56 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 0.75 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. A heavy-duty fastener size associated with large-frame pillow blocks, designed to anchor housings that carry significant shaft loads under continuous or demanding operating conditions.

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 0.75 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 0.75 inch bolt corresponds to a heavy-duty hole pattern associated with large-frame housings carrying significant shaft loads, 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.

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