UCP322 bearing: complete specifications & equivalents
The UCP322 is a JIS B 1559 radial bearing sized 110 x 240 x 117 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 110 mm |
| Outer diameter D | 240 mm |
| Width B | 117 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 227 kN |
| Basic static load rating C0 | 179 kN |
| Fatigue load limit Pu | 10.5 kN |
| Mass | 43000 g |
| Housing height H | 150 mm |
| Housing overall length L | 520 mm |
| Mounting bolt center distance J | 400 mm |
| Mounting hole diameter N | 40 mm |
| Manufacturer designation | UCP322 |
| Standard | JIS B 1559 |
| Catalog version | CAT. No. 2203-3/E 2024 |
| Last verified | 2026-09-25 |
Source: catalog reference (CAT. No. 2203-3/E 2024) · extracted 2026-09-25
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (CAT. No. 2203-3/E 2024); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & UCP-series range
| Bore d | 4.331 in |
|---|---|
| Outer diameter D | 9.449 in |
| Width B | 4.606 in |
| ISO bore code | 22 |
| Radial section height (D−d)/2 | 65 mm |
| Smallest bore in UCP-series | 12 mm |
| Largest outer diameter in UCP-series | 300 mm |
| Width range across UCP-series | 31–145 mm |
| Bore position in UCP-series (smallest first) | 22 of 25 |
| Bore above smallest UCP-series size | 98 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP322 | ISO 15 | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the UCP322 model number is decoded
A 110 mm bore upright mounted bearing, NTN UCP322 combines the UC322D1 self-aligning insert with the grey-iron P322 pillow block base. NTN's numbering ties the unit to its components: UCP322 means the P322 housing carrying the UC322D1 insert, with the last two digits denoting the 110 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 150 mm centre height, L 520 mm total length, J 400 mm between the 40 mm bolt holes, and a 110 mm shaft passing through the 240 mm OD insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC322D1 insert are 227 kN dynamic and 179 kN static; the assembled UCP322 weighs about 43.0 kg.
Typical equipment & failure modes
Common applications
- ship-loader and stacker drives
- mining and port conveyor pulleys
- primary crusher feeders
- wet, abrasive or chemically aggressive environments relying on the lip seals and slingers
Known failure patterns
- lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear
- spherical-seat fretting that welds insert to housing and destroys the self-aligning action
- water-emulsified grease after washdown with the fitting facing upward
Selection pitfalls — read before you substitute
- As a pillow block, UCP322 needs a prepared horizontal surface at the 150 mm centre height: shim both feet with full-width packs so the 520 mm base seats over its full area.
- The lip seals and slingers on UCP322 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.
- Never weld a bracket to the P322 housing of UCP322: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- Foundation design for UCP322 must resist the belt-pull reaction at 150 mm centre height — a moment arm this large walks an inadequately anchored base under load.
- The 3-series insert makes UCP322 the highest-rated unit at 110 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
Frequently asked questions
What does the UCP322 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 110 mm bore. UCP322 is built from housing P322 plus insert UC322D1 (D1 = greasable).
How is UCP322 locked to the shaft, and how tight should the setscrews be?
The UC322D1 insert uses two collar setscrews on the 110 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated.
When should I choose a pillow block like UCP322 instead of a flanged unit?
Choose the UCP322 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 150 mm above the 520 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
Is the UCP322 bearing self-aligning?
Yes within limits. The UC322D1 insert has a spherical outer diameter that pivots in the P322 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running.
What are the dimensions of an UCP322 mounted bearing?
UCP322 takes a 110 mm shaft (insert UC322D1, 240 mm OD) and has a unit mass of about 43.0 kg. Housing figures: centre height H 150 mm, length L 520 mm, bolt centres J 400 mm, foot holes 40 mm for M33 bolts.
Reviewed & verified by the MPN Base engineering desk against source catalog CAT. No. 2203-3/E 2024 on 2026-09-25. Read our editorial & correction policy.