UCP206 bearing: complete specifications & equivalents
The UCP206 is a JIS B 1559 radial bearing sized 30 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 | 30 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 | 42.9 mm |
| Housing overall length L | 165 mm |
| Mounting bolt center distance J | 121 mm |
| Mounting hole diameter N | 17 mm |
| Manufacturer designation | UCP206 |
| 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 | 1.181 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 1.5 in |
| ISO bore code | 06 |
| Radial section height (D−d)/2 | 16 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) | 6 of 25 |
| Bore above smallest UCP-series size | 18 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP206 | 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 UCP206 model number is decoded
UCP206 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC206D1) pre-assembled in a P206 two-bolt plummer housing. On the nameplate, UCP206 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 30 mm bore; the UC206D1 designation shows the D1 greasable execution. Boundary data for the 30 mm bore: housing centre height 42.9 mm, base 165 mm, mounting centres 121 mm for M14 fasteners through 17 mm holes; the UC206D1 insert itself is 62 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. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UC206D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCP206 weighs about 1.4 kg.
Typical equipment & failure modes
Common applications
- belt conveyor head, tail and bend pulleys
- industrial fans and blowers
- agricultural augers and bucket elevators
- washdown-duty food and pharmaceutical areas using purge relubrication
Known failure patterns
- housing-foot cracking beside an over-torqued or under-supported foundation bolt
- grease starvation on long intervals in hot positions, with the ball set running on dried thickener
- fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep
Selection pitfalls — read before you substitute
- The standard 2-series insert in UCP206 is the lightest section at 30 mm — do not substitute it into a position that previously ran an X or 3 unit: the 121 mm mounting may match while the load rating does not.
- As a pillow block, UCP206 needs a prepared horizontal surface at the 42.9 mm centre height: shim both feet with full-width packs so the 165 mm base seats over its full area.
- Self-aligning is not the same as free to move: the UC206D1 insert of UCP206 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.
- With a 30 mm shaft the M14 foundation bolts of UCP206 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.
Frequently asked questions
What are the dimensions of an UCP206 mounted bearing?
UCP206 takes a 30 mm shaft (insert UC206D1, 62 mm OD) and has a unit mass of about 1.4 kg. Housing figures: centre height H 42.9 mm, length L 165 mm, bolt centres J 121 mm, foot holes 17 mm for M14 bolts.
What does the UCP206 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 30 mm bore. UCP206 is built from housing P206 plus insert UC206D1 (D1 = greasable).
How is UCP206 locked to the shaft, and how tight should the setscrews be?
The UC206D1 insert uses two collar setscrews on the 30 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 UCP206 instead of a flanged unit?
Choose the UCP206 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 42.9 mm above the 165 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
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.