UCP210 bearing: complete specifications & equivalents
The UCP210 is a JIS B 1559 radial bearing sized 50 x 90 x 51.6 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 | 50 mm |
| Outer diameter D | 90 mm |
| Width B | 51.6 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 39 kN |
| Basic static load rating C0 | 23.2 kN |
| Fatigue load limit Pu | 1.82 kN |
| Mass | 2700 g |
| Housing height H | 57.2 mm |
| Housing overall length L | 206 mm |
| Mounting bolt center distance J | 159 mm |
| Mounting hole diameter N | 20 mm |
| Manufacturer designation | UCP210 |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 2.031 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 20 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) | 10 of 25 |
| Bore above smallest UCP-series size | 38 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP210 | 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 UCP210 model number is decoded
The NTN UCP210 unit pairs a UC210D1 sealed ball bearing insert with a one-piece P210 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCP210 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 50 mm bore; the UC210D1 designation shows the D1 greasable execution. Boundary data for the 50 mm bore: housing centre height 57.2 mm, base 206 mm, mounting centres 159 mm for M16 fasteners through 20 mm holes; the UC210D1 insert itself is 90 mm OD. 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. 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. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC210D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCP210 weighs about 2.7 kg.
Typical equipment & failure modes
Common applications
- industrial fans and blowers
- agricultural augers and bucket elevators
- small crushers and screening feeds
- vibrating feeder and screen-adjacent positions where setscrew retorque is routine
Known failure patterns
- water-emulsified grease after washdown with the fitting facing upward
- 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
Selection pitfalls — read before you substitute
- Do not confuse UCP210 with a bare UC210D1 bearing: replacing only the insert is possible, but the housing P210 must be unworn and the spherical seat cleaned and coated with anti-seize.
- When ordering covers for UCP210, note the steel and cast-iron cover executions change the unit mass and envelope but not the 159 mm mounting centres.
- In this bore band the temptation is to choose UCP210 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 standard 2-series insert in UCP210 is the lightest section at 50 mm — do not substitute it into a position that previously ran an X or 3 unit: the 159 mm mounting may match while the load rating does not.
- As a pillow block, UCP210 needs a prepared horizontal surface at the 57.2 mm centre height: shim both feet with full-width packs so the 206 mm base seats over its full area.
Frequently asked questions
How is UCP210 locked to the shaft, and how tight should the setscrews be?
The UC210D1 insert uses two collar setscrews on the 50 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 UCP210 instead of a flanged unit?
Choose the UCP210 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 57.2 mm above the 206 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
Can I replace just the insert inside an UCP210 unit?
Yes — UCP210 is an assembly of the P210 housing and UC210D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 50 mm shaft are not the reason the old insert failed.
What are the dimensions of an UCP210 mounted bearing?
UCP210 takes a 50 mm shaft (insert UC210D1, 90 mm OD) and has a unit mass of about 2.7 kg. Housing figures: centre height H 57.2 mm, length L 206 mm, bolt centres J 159 mm, foot holes 20 mm for M16 bolts.
What does the UCP210 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 50 mm bore. UCP210 is built from housing P210 plus insert UC210D1 (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.