UCP215 bearing: complete specifications & equivalents
The UCP215 is a JIS B 1559 radial bearing sized 75 x 130 x 77.8 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 | 130 mm |
| Width B | 77.8 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 73.5 kN |
| Basic static load rating C0 | 49.5 kN |
| Fatigue load limit Pu | 3.8 kN |
| Mass | 7200 g |
| Housing height H | 82.6 mm |
| Housing overall length L | 275 mm |
| Mounting bolt center distance J | 217 mm |
| Mounting hole diameter N | 25 mm |
| Manufacturer designation | UCP215 |
| 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 | 5.118 in |
| Width B | 3.063 in |
| ISO bore code | 15 |
| Radial section height (D−d)/2 | 27.5 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 |
|---|---|---|---|
| UCP215 | 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 UCP215 model number is decoded
UCP215 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC215D1) pre-assembled in a P215 two-bolt plummer housing. On the nameplate, UCP215 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 75 mm bore; the UC215D1 designation shows the D1 greasable execution. Boundary data for the 75 mm bore: housing centre height 82.6 mm, base 275 mm, mounting centres 217 mm for M20 fasteners through 25 mm holes; the UC215D1 insert itself is 130 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. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. 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 UC215D1 insert are 73.5 kN dynamic and 49.5 kN static; the assembled UCP215 weighs about 7.2 kg.
Typical equipment & failure modes
Common applications
- heavy bulk-handling conveyors
- process fans and induced-draft drives
- quarry feeder and transfer drives
- low-speed heavily loaded pulleys where the static rating governs the selection
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
- Never weld a bracket to the P215 housing of UCP215: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- Heavy drives on UCP215 should have the setscrews re-torqued after the first day; at 75 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.
- The standard 2-series insert in UCP215 is the lightest section at 75 mm — do not substitute it into a position that previously ran an X or 3 unit: the 217 mm mounting may match while the load rating does not.
- As a pillow block, UCP215 needs a prepared horizontal surface at the 82.6 mm centre height: shim both feet with full-width packs so the 275 mm base seats over its full area.
Frequently asked questions
How is UCP215 locked to the shaft, and how tight should the setscrews be?
The UC215D1 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 UCP215 instead of a flanged unit?
Choose the UCP215 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 82.6 mm above the 275 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 UCP215 mounted bearing?
UCP215 takes a 75 mm shaft (insert UC215D1, 130 mm OD) and has a unit mass of about 7.2 kg. Housing figures: centre height H 82.6 mm, length L 275 mm, bolt centres J 217 mm, foot holes 25 mm for M20 bolts.
What does the UCP215 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 75 mm bore. UCP215 is built from housing P215 plus insert UC215D1 (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.