UCP205 bearing: complete specifications & equivalents
The UCP205 is a JIS B 1559 radial bearing sized 25 x 52 x 34.1 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 | 52 mm |
| Width B | 34.1 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 15.5 kN |
| Basic static load rating C0 | 7.85 kN |
| Fatigue load limit Pu | 0.55 kN |
| Mass | 800 g |
| Housing height H | 36.5 mm |
| Housing overall length L | 140 mm |
| Mounting bolt center distance J | 105 mm |
| Mounting hole diameter N | 13 mm |
| Manufacturer designation | UCP205 |
| 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 | 2.047 in |
| Width B | 1.343 in |
| ISO bore code | 05 |
| Radial section height (D−d)/2 | 13.5 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 |
|---|---|---|---|
| UCP205 | 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 UCP205 model number is decoded
A 25 mm bore upright mounted bearing, NTN UCP205 combines the UC205D1 self-aligning insert with the grey-iron P205 pillow block base. NTN's numbering ties the unit to its components: UCP205 means the P205 housing carrying the UC205D1 insert, with the last two digits denoting the 25 mm bore in the 2-series duty class. The foundation drawing needs four numbers: H 36.5 mm centre height, L 140 mm total length, J 105 mm between the 13 mm bolt holes, and a 25 mm shaft passing through the 52 mm OD insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. 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. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UC205D1 insert are 15.5 kN dynamic and 7.85 kN static; the assembled UCP205 weighs about 0.8 kg.
Typical equipment & failure modes
Common applications
- machine-tool chip conveyors
- belt conveyor head, tail and bend pulleys
- industrial fans and blowers
- elevated-temperature positions where grease life, not bearing rating, sets the interval
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, UCP205 needs a prepared horizontal surface at the 36.5 mm centre height: shim both feet with full-width packs so the 140 mm base seats over its full area.
- At replacement time, measure the 25 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCP205 creep identically to the old one.
- UCP205 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 25 mm journal over time.
- The standard section of UCP205 can look adequate at 25 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.
- The standard 2-series insert in UCP205 is the lightest section at 25 mm — do not substitute it into a position that previously ran an X or 3 unit: the 105 mm mounting may match while the load rating does not.
Frequently asked questions
What does the UCP205 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 25 mm bore. UCP205 is built from housing P205 plus insert UC205D1 (D1 = greasable).
How is UCP205 locked to the shaft, and how tight should the setscrews be?
The UC205D1 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 UCP205 instead of a flanged unit?
Choose the UCP205 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 36.5 mm above the 140 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 UCP205 bearing self-aligning?
Yes within limits. The UC205D1 insert has a spherical outer diameter that pivots in the P205 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 UCP205 mounted bearing?
UCP205 takes a 25 mm shaft (insert UC205D1, 52 mm OD) and has a unit mass of about 0.8 kg. Housing figures: centre height H 36.5 mm, length L 140 mm, bolt centres J 105 mm, foot holes 13 mm for M10 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.