UCPX13 bearing: complete specifications & equivalents
The UCPX13 is a JIS B 1559 radial bearing sized 65 x 140 x 74.6 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 | 65 mm |
| Outer diameter D | 140 mm |
| Width B | 74.6 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 69 kN |
| Basic static load rating C0 | 44 kN |
| Fatigue load limit Pu | 3.45 kN |
| Mass | 7100 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 | UCPX13 |
| 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 | 2.559 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 2.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 37.5 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) | 13 of 25 |
| Bore above smallest UCP-series size | 53 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCPX13 | 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 UCPX13 model number is decoded
NTN ships the UCPX13 as a matched assembly — UCX13D1 insert swaged into the PX13 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the X code identifies the duty series and the final two digits encode the 65 mm bore. Key mounting figures: centre height H = 76.2 mm, overall base length L = 286 mm, bolt-hole spacing J = 203 mm, and each of the two feet takes a 25 mm (M20) fastener for the 65 mm shaft. 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. 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. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UCX13D1 insert are 69 kN dynamic and 44 kN static; the assembled UCPX13 weighs about 7.1 kg.
Typical equipment & failure modes
Common applications
- sawmill arbors and feed rolls
- cement and clinker handling
- sugar-mill and fertiliser plant drives
- elevated-temperature positions where grease life, not bearing rating, sets the interval
Known failure patterns
- cracked cast ear from mounting on an uneven face and pulling one bolt fully first
- 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
Selection pitfalls — read before you substitute
- Heavy drives on UCPX13 should have the setscrews re-torqued after the first day; at 65 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.
- The X insert of UCPX13 is wider and rated above the 2-series part at 65 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, UCPX13 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.
- The lip seals and slingers on UCPX13 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.
- Never weld a bracket to the PX13 housing of UCPX13: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
Frequently asked questions
Does UCPX13 interchange with other brands at the same size?
Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 203 mm bolt centres of UCPX13 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match.
What are the dimensions of an UCPX13 mounted bearing?
UCPX13 takes a 65 mm shaft (insert UCX13D1, 140 mm OD) and has a unit mass of about 7.1 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 UCPX13 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 65 mm bore. UCPX13 is built from housing PX13 plus insert UCX13D1 (D1 = greasable).
How is UCPX13 locked to the shaft, and how tight should the setscrews be?
The UCX13D1 insert uses two collar setscrews on the 65 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 UCPX13 instead of a flanged unit?
Choose the UCPX13 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.
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.