UCPX05 bearing: complete specifications & equivalents
The UCPX05 is a JIS B 1559 radial bearing sized 25 x 62 x 38.1 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 | 25 mm |
| Outer diameter D | 62 mm |
| Width B | 38.1 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 21.6 kN |
| Basic static load rating C0 | 11.3 kN |
| Fatigue load limit Pu | 0.795 kN |
| Mass | 1400 g |
| Housing height H | 44.4 mm |
| Housing overall length L | 159 mm |
| Mounting bolt center distance J | 119 mm |
| Mounting hole diameter N | 17 mm |
| Manufacturer designation | UCPX05 |
| 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 | 0.984 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 1.5 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 18.5 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) | 5 of 25 |
| Bore above smallest UCP-series size | 13 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCPX05 | 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 UCPX05 model number is decoded
UCPX05 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UCX05D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series X, bore code ending in the 25 mm shaft size; the unit is built from insert UCX05D1 and housing PX05. For layout work on UCPX05: the 25 mm shaft centre sits 44.4 mm above the sole (H), the footprint is 159 mm long (L), bolt centres are 119 mm (J), and the foot holes suit M14 (17 mm) bolts. 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. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UCX05D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCPX05 weighs about 1.4 kg.
Typical equipment & failure modes
Common applications
- textile line-shafting
- machine-tool chip conveyors
- belt conveyor head, tail and bend pulleys
- fan drives where belt tension, not transmitted torque, sets the radial load
Known failure patterns
- setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in
- insert brinelling from hammer mounting or from belt tension applied to a stationary unit
- over-greasing that churns the charge, overheats the bearing and blows the seal lip
Selection pitfalls — read before you substitute
- Never weld a bracket to the PX05 housing of UCPX05: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- In this bore band the temptation is to choose UCPX05 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.
- The X insert of UCPX05 is wider and rated above the 2-series part at 25 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.
- As a pillow block, UCPX05 needs a prepared horizontal surface at the 44.4 mm centre height: shim both feet with full-width packs so the 159 mm base seats over its full area.
Frequently asked questions
How is UCPX05 locked to the shaft, and how tight should the setscrews be?
The UCX05D1 insert uses two collar setscrews on the 25 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 UCPX05 instead of a flanged unit?
Choose the UCPX05 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 44.4 mm above the 159 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
What are the dimensions of an UCPX05 mounted bearing?
UCPX05 takes a 25 mm shaft (insert UCX05D1, 62 mm OD) and has a unit mass of about 1.4 kg. Housing figures: centre height H 44.4 mm, length L 159 mm, bolt centres J 119 mm, foot holes 17 mm for M14 bolts.
What does the UCPX05 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 25 mm bore. UCPX05 is built from housing PX05 plus insert UCX05D1 (D1 = greasable).
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.