UCPX07 bearing: complete specifications & equivalents
The UCPX07 is a JIS B 1559 radial bearing sized 35 x 80 x 49.2 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 | 35 mm |
| Outer diameter D | 80 mm |
| Width B | 49.2 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 32.5 kN |
| Basic static load rating C0 | 17.8 kN |
| Fatigue load limit Pu | 1.24 kN |
| Mass | 2400 g |
| Housing height H | 54 mm |
| Housing overall length L | 203 mm |
| Mounting bolt center distance J | 144 mm |
| Mounting hole diameter N | 17 mm |
| Manufacturer designation | UCPX07 |
| 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 | 1.378 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 1.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 22.5 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) | 7 of 25 |
| Bore above smallest UCP-series size | 23 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCPX07 | 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 UCPX07 model number is decoded
UCPX07 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UCX07D1) pre-assembled in a PX07 two-bolt plummer housing. On the nameplate, UCPX07 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 35 mm bore; the UCX07D1 designation shows the D1 greasable execution. Boundary data for the 35 mm bore: housing centre height 54 mm, base 203 mm, mounting centres 144 mm for M14 fasteners through 17 mm holes; the UCX07D1 insert itself is 80 mm OD. 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. 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. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UCX07D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCPX07 weighs about 2.4 kg.
Typical equipment & failure modes
Common applications
- belt conveyor head, tail and bend pulleys
- industrial fans and blowers
- agricultural augers and bucket elevators
- 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
- The X insert of UCPX07 is wider and rated above the 2-series part at 35 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, UCPX07 needs a prepared horizontal surface at the 54 mm centre height: shim both feet with full-width packs so the 203 mm base seats over its full area.
- Self-aligning is not the same as free to move: the UCX07D1 insert of UCPX07 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.
- With a 35 mm shaft the M14 foundation bolts of UCPX07 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 UCPX07 mounted bearing?
UCPX07 takes a 35 mm shaft (insert UCX07D1, 80 mm OD) and has a unit mass of about 2.4 kg. Housing figures: centre height H 54 mm, length L 203 mm, bolt centres J 144 mm, foot holes 17 mm for M14 bolts.
What does the UCPX07 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 35 mm bore. UCPX07 is built from housing PX07 plus insert UCX07D1 (D1 = greasable).
How is UCPX07 locked to the shaft, and how tight should the setscrews be?
The UCX07D1 insert uses two collar setscrews on the 35 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 UCPX07 instead of a flanged unit?
Choose the UCPX07 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 54 mm above the 203 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.