Mounted Bearings: Pillow Blocks, Flange Units & Take-Ups

Mounted bearings are ready-to-bolt units that combine a sealed bearing insert with a cast housing - pillow block, flange, or take-up frame - so a rotating shaft can be supported without a machined bore. Texas Belting stocks 3,200+ mounted units in Houston, TX, including our Turner carbon-steel and Mariner stainless washdown lines.

Shop mounted bearings by type

On this page: Size chart · Bore decoder · Housing styles · Locking styles · Interchange · Type-E units · Identify yours · FAQ

Pillow block bearing size chart (UCP200 series)

Three dimensions identify a pillow block bearing: shaft bore, center height from the mounting base to the shaft centerline, and bolt-hole center-to-center spacing. The UCP200 series is the industry-standard normal-duty pattern; the chart below covers the most common sizes, 3/4 in through 2-1/4 in (20-60 mm), and the series continues up to UCP218 for 3-1/2 in (90 mm) shafts. Match your measurements to a row below, or call for a size off the chart.

Dimensions are nominal ISO/JIS-pattern values; foundries vary by a few hundredths. Slotted base holes give roughly 5/16 to 3/8 in of play either side of nominal - a UCP205 accepts bolt centers from about 3-3/4 to 4-1/2 in. A 2 in shaft fits both UCP210-32 and the heavier UCP211-32, so you can step up capacity without touching the shaft.

What does the -16 in UCP205-16 mean?

The dash number is the shaft bore in sixteenths of an inch: -16 means 16/16 in, a 1 in shaft. No dash suffix means metric - a plain UCP205 has a 25 mm bore. The letters give housing and locking style (UCP = set-screw insert, pillow block housing); the middle digits set the size series.

Metric units skip the suffix; the series number itself sets the bore (last two digits times 5 for sizes 04 and up):

UCP vs UCF vs UCFL vs UCT: which housing style do you need?

The letters ahead of the size number set the housing. UCP is a two-bolt pillow block for surfaces parallel to the shaft. UCF is a four-bolt square flange and UCFL a two-bolt flange, both for walls the shaft passes through. UCT slides in a frame to tension a belt. All four take the same UC insert for a given size.

UCFB (three-bolt bracket) and UCFC (round piloted cartridge) variants live in the same flange bearing collection.

Set screw, eccentric collar, or concentric clamp?

The locking style is how the insert grips the shaft, and it is coded in the part number. Set-screw inserts (UC prefix) are the general-purpose default; eccentric locking collars (HC prefix) hold better in vibrating one-direction drives; concentric clamps grip evenly for reversing drives and best runout. All three fit the same housings.

Are mounted bearings interchangeable between brands?

Within the ISO/JIS UC pattern, yes: a UCP205-16 from AMI, FYH, NTN, or our Turner line shares the same nominal bore, center height, bolt spacing, and insert. Dodge, Sealmaster, Browning, and Link-Belt publish interchange lists mapping their proprietary numbers to the same unit. The 1 in two-bolt set-screw pillow block across major brands:

Interchange references are based on manufacturer-published equivalents. Verify dimensions before ordering.

Turner Type-E tapered roller units: when ball inserts are not enough

A UC-series ball insert covers most fan, conveyor, and pump duty, but heavy loads, frequent shock, or combined radial and thrust loads outrun it. Type-E mounted units use tapered roller elements in housings built to the industry-standard Type-E dimension pattern, in shaft sizes from 1-3/16 in up. Our Turner Type-E line covers two-bolt and four-bolt pillow blocks plus flange styles.

Typical published dynamic ratings (Cr) for UC200-series ball inserts - they vary slightly by maker:

If your load runs close to those numbers, or the drive sees regular shock (crushers, screens, aggregate conveyors) or real thrust, step up a series or move to Type-E. The pattern is shared across Dodge, Sealmaster, Browning, Moline, and Royersford, so a Turner Type-E unit drops into the same footprint.

Identify a worn mounted bearing in three measurements

With the machine locked out, calipers and a tape measure identify almost any mounted unit: shaft diameter, center height, and bolt spacing. Match all three to the size chart above and you have the unit number - no nameplate needed.

• 1. Mic the shaft, not the housing. The bore code follows shaft OD; a reading just under a round number (0.984, 1.181, 1.575) means a metric shaft.
• 2. Measure center height (H) from the mounting base to the shaft centerline - it must match the replacement exactly.
• 3. Measure bolt center-to-center. Slots forgive small differences; on flange units, count the holes (2, 3, or 4) to pick UCFL, UCFB, or UCF.

A legible insert stamp (UC205-16, HC206-20) gives bore and locking style directly.

Mounted bearing supplier in Houston, TX

Texas Belting stocks 3,200+ mounted bearing units - pillow blocks, flange units, take-ups, inserts, and stainless washdown styles - in our Houston, TX warehouse. Most stocked sizes ship same day, and cross-reference quotes typically turn around within one business day. We serve the Texas Gulf Coast and ship nationwide. Call (888) 203-2358 to confirm availability.

Common mounted bearing selection mistakes

• Measuring the housing instead of the shaft. The unit number keys off shaft OD; housing castings vary between foundries.
• Reading 0.984 in as 1 in. That is a 25 mm metric shaft - an inch insert will wobble, loosen, and wipe out the shaft.
• Ignoring center height. Bolt slots absorb spacing errors; center height has no slack.
• Dropping a new insert into a spun housing. A worn spherical seat spins the new insert too. Replace the complete unit.
• Set-screw locking on vibrating or reversing drives. Set screws back off under vibration; eccentric collars back off under reversal.
• Ordering by the housing casting number. P205 identifies only the empty housing, not bore or locking style.

When to call instead of ordering online

Call us when:

• The insert stamp is gone and the shaft mics to an odd decimal matching neither chart
• Loads, speed, or temperature push past typical UC ratings and you are weighing Type-E or spherical roller options
• You are picking between stainless, coated, and standard units for washdown or chemical exposure
• You need a take-up unit and frame sized to a conveyor's travel

Call (888) 203-2358 or send us what you have.

Frequently asked questions

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Last updated: July 2026