UCPX08 bearing: complete specifications & equivalents

Specification table

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.

Cross references & equivalents

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 UCPX08 model number is decoded

The NTN UCPX08 unit pairs a UCX08D1 sealed ball bearing insert with a one-piece PX08 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCPX08 number follows NTN's mounted-unit convention: housing letter P, X-series section, bore code for 40 mm; PX08 and UCX08D1 are the separate housing and insert part numbers inside. Shaft size is 40 mm; the cast base stands 58.7 mm to the shaft centre (H), is 222 mm long overall (L), and the two foundation holes on 156 mm centres (J) clear 20 mm M16 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. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UCX08D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCPX08 weighs about 2.9 kg.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• When ordering covers for UCPX08, note the steel and cast-iron cover executions change the unit mass and envelope but not the 156 mm mounting centres.
• In this bore band the temptation is to choose UCPX08 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.
• The X insert of UCPX08 is wider and rated above the 2-series part at 40 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, UCPX08 needs a prepared horizontal surface at the 58.7 mm centre height: shim both feet with full-width packs so the 222 mm base seats over its full area.
• Do not confuse UCPX08 with a bare UCX08D1 bearing: replacing only the insert is possible, but the housing PX08 must be unworn and the spherical seat cleaned and coated with anti-seize.