UCPX12 bearing: complete specifications & equivalents
The UCPX12 is a JIS B 1559 radial bearing sized 60 x 130 x 65.1 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 | 60 mm |
| Outer diameter D | 130 mm |
| Width B | 65.1 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 63.5 kN |
| Basic static load rating C0 | 40 kN |
| Fatigue load limit Pu | 3.15 kN |
| Mass | 6800 g |
| Housing height H | 76.2 mm |
| Housing overall length L | 286 mm |
| Mounting bolt center distance J | 203 mm |
| Mounting hole diameter N | 25 mm |
| Manufacturer designation | UCPX12 |
| 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 | 2.362 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 2.563 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 35 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) | 12 of 25 |
| Bore above smallest UCP-series size | 48 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCPX12 | 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 UCPX12 model number is decoded
In NTN's mounted-ball-bearing range, UCPX12 is the classic upright pillow block for a 60 mm shaft: insert UCX12D1, housing PX12, two foundation bolts. The UCPX12 number follows NTN's mounted-unit convention: housing letter P, X-series section, bore code for 60 mm; PX12 and UCX12D1 are the separate housing and insert part numbers inside. Shaft size is 60 mm; the cast base stands 76.2 mm to the shaft centre (H), is 286 mm long overall (L), and the two foundation holes on 203 mm centres (J) clear 25 mm M20 bolts. 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. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UCX12D1 insert are 63.5 kN dynamic and 40 kN static; the assembled UCPX12 weighs about 6.8 kg.
Typical equipment & failure modes
Common applications
- quarry feeder and transfer drives
- sawmill arbors and feed rolls
- cement and clinker handling
- continuous one-direction running where creep risk concentrates on the setscrew points
Known failure patterns
- fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep
- 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
Selection pitfalls — read before you substitute
- UCPX12 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 60 mm journal over time.
- UCPX12 at 60 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 76.2 mm centre height and binds the insert.
- The X insert of UCPX12 is wider and rated above the 2-series part at 60 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, UCPX12 needs a prepared horizontal surface at the 76.2 mm centre height: shim both feet with full-width packs so the 286 mm base seats over its full area.
Frequently asked questions
How is UCPX12 locked to the shaft, and how tight should the setscrews be?
The UCX12D1 insert uses two collar setscrews on the 60 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 UCPX12 instead of a flanged unit?
Choose the UCPX12 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 76.2 mm above the 286 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 UCPX12 mounted bearing?
UCPX12 takes a 60 mm shaft (insert UCX12D1, 130 mm OD) and has a unit mass of about 6.8 kg. Housing figures: centre height H 76.2 mm, length L 286 mm, bolt centres J 203 mm, foot holes 25 mm for M20 bolts.
What does the UCPX12 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 60 mm bore. UCPX12 is built from housing PX12 plus insert UCX12D1 (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.