UCPX06 bearing: complete specifications & equivalents
The UCPX06 is a JIS B 1559 radial bearing sized 30 x 72 x 42.9 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 | 72 mm |
| Width B | 42.9 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 28.4 kN |
| Basic static load rating C0 | 15.3 kN |
| Fatigue load limit Pu | 1.09 kN |
| Mass | 1800 g |
| Housing height H | 47.6 mm |
| Housing overall length L | 175 mm |
| Mounting bolt center distance J | 127 mm |
| Mounting hole diameter N | 17 mm |
| Manufacturer designation | UCPX06 |
| 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 | 2.835 in |
| Width B | 1.689 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 21 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 |
|---|---|---|---|
| UCPX06 | 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 UCPX06 model number is decoded
A 30 mm bore upright mounted bearing, NTN UCPX06 combines the UCX06D1 self-aligning insert with the grey-iron PX06 pillow block base. NTN's numbering ties the unit to its components: UCPX06 means the PX06 housing carrying the UCX06D1 insert, with the last two digits denoting the 30 mm bore in the X-series duty class. The foundation drawing needs four numbers: H 47.6 mm centre height, L 175 mm total length, J 127 mm between the 17 mm bolt holes, and a 30 mm shaft passing through the 72 mm OD insert. 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. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UCX06D1 insert are 28.4 kN dynamic and 15.3 kN static; the assembled UCPX06 weighs about 1.8 kg.
Typical equipment & failure modes
Common applications
- machine-tool chip conveyors
- belt conveyor head, tail and bend pulleys
- industrial fans and blowers
- frequent stop-start and reversing duty such as shuttle and tripper conveyors
Known failure patterns
- 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
- water-emulsified grease after washdown with the fitting facing upward
Selection pitfalls — read before you substitute
- As a pillow block, UCPX06 needs a prepared horizontal surface at the 47.6 mm centre height: shim both feet with full-width packs so the 175 mm base seats over its full area.
- At replacement time, measure the 30 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCPX06 creep identically to the old one.
- UCPX06 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 30 mm journal over time.
- The standard section of UCPX06 can look adequate at 30 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.
- The X insert of UCPX06 is wider and rated above the 2-series part at 30 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.
Frequently asked questions
What does the UCPX06 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 30 mm bore. UCPX06 is built from housing PX06 plus insert UCX06D1 (D1 = greasable).
How is UCPX06 locked to the shaft, and how tight should the setscrews be?
The UCX06D1 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 UCPX06 instead of a flanged unit?
Choose the UCPX06 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 47.6 mm above the 175 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
Is the UCPX06 bearing self-aligning?
Yes within limits. The UCX06D1 insert has a spherical outer diameter that pivots in the PX06 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running.
What are the dimensions of an UCPX06 mounted bearing?
UCPX06 takes a 30 mm shaft (insert UCX06D1, 72 mm OD) and has a unit mass of about 1.8 kg. Housing figures: centre height H 47.6 mm, length L 175 mm, bolt centres J 127 mm, foot holes 17 mm for M14 bolts.
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.