UCPX15 bearing: complete specifications & equivalents
The UCPX15 is a JIS B 1559 radial bearing sized 75 x 160 x 82.6 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 | 75 mm |
| Outer diameter D | 160 mm |
| Width B | 82.6 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 80.5 kN |
| Basic static load rating C0 | 53 kN |
| Fatigue load limit Pu | 3.95 kN |
| Mass | 10000 g |
| Housing height H | 88.9 mm |
| Housing overall length L | 330 mm |
| Mounting bolt center distance J | 229 mm |
| Mounting hole diameter N | 27 mm |
| Manufacturer designation | UCPX15 |
| 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 | 2.953 in |
|---|---|
| Outer diameter D | 6.299 in |
| Width B | 3.252 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 42.5 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) | 15 of 25 |
| Bore above smallest UCP-series size | 63 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCPX15 | 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 UCPX15 model number is decoded
A 75 mm bore upright mounted bearing, NTN UCPX15 combines the UCX15D1 self-aligning insert with the grey-iron PX15 pillow block base. NTN's numbering ties the unit to its components: UCPX15 means the PX15 housing carrying the UCX15D1 insert, with the last two digits denoting the 75 mm bore in the X-series duty class. The foundation drawing needs four numbers: H 88.9 mm centre height, L 330 mm total length, J 229 mm between the 27 mm bolt holes, and a 75 mm shaft passing through the 160 mm OD insert. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. 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. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UCX15D1 insert are 80.5 kN dynamic and 53 kN static; the assembled UCPX15 weighs about 10.0 kg.
Typical equipment & failure modes
Common applications
- sugar-mill and fertiliser plant drives
- heavy bulk-handling conveyors
- process fans and induced-draft drives
- vibrating feeder and screen-adjacent positions where setscrew retorque is routine
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, UCPX15 needs a prepared horizontal surface at the 88.9 mm centre height: shim both feet with full-width packs so the 330 mm base seats over its full area.
- The D1 suffix on UCX15D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCPX15 on site accepts relubrication.
- Self-aligning is not the same as free to move: the UCX15D1 insert of UCPX15 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.
- UCPX15 at 75 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 88.9 mm centre height and binds the insert.
- The X insert of UCPX15 is wider and rated above the 2-series part at 75 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.
Frequently asked questions
What does the UCPX15 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 75 mm bore. UCPX15 is built from housing PX15 plus insert UCX15D1 (D1 = greasable).
How is UCPX15 locked to the shaft, and how tight should the setscrews be?
The UCX15D1 insert uses two collar setscrews on the 75 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 UCPX15 instead of a flanged unit?
Choose the UCPX15 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 88.9 mm above the 330 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 UCPX15 bearing self-aligning?
Yes within limits. The UCX15D1 insert has a spherical outer diameter that pivots in the PX15 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 UCPX15 mounted bearing?
UCPX15 takes a 75 mm shaft (insert UCX15D1, 160 mm OD) and has a unit mass of about 10.0 kg. Housing figures: centre height H 88.9 mm, length L 330 mm, bolt centres J 229 mm, foot holes 27 mm for M22 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.