UCPX09 bearing: complete specifications & equivalents
The UCPX09 is a JIS B 1559 radial bearing sized 45 x 100 x 51.6 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 | 45 mm |
| Outer diameter D | 100 mm |
| Width B | 51.6 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 39 kN |
| Basic static load rating C0 | 23.2 kN |
| Fatigue load limit Pu | 1.82 kN |
| Mass | 3200 g |
| Housing height H | 58.7 mm |
| Housing overall length L | 222 mm |
| Mounting bolt center distance J | 156 mm |
| Mounting hole diameter N | 20 mm |
| Manufacturer designation | UCPX09 |
| 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 | 1.772 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 2.031 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 27.5 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) | 9 of 25 |
| Bore above smallest UCP-series size | 33 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCPX09 | 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 UCPX09 model number is decoded
In NTN's mounted-ball-bearing range, UCPX09 is the classic upright pillow block for a 45 mm shaft: insert UCX09D1, housing PX09, two foundation bolts. 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 45 mm bore. Key mounting figures: centre height H = 58.7 mm, overall base length L = 222 mm, bolt-hole spacing J = 156 mm, and each of the two feet takes a 20 mm (M16) fastener for the 45 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. 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. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UCX09D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCPX09 weighs about 3.2 kg.
Typical equipment & failure modes
Common applications
- agricultural augers and bucket elevators
- small crushers and screening feeds
- textile line-shafting
- continuous one-direction running where creep risk concentrates on the setscrew points
Known failure patterns
- spherical-seat fretting that welds insert to housing and destroys the self-aligning action
- water-emulsified grease after washdown with the fitting facing upward
- setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in
Selection pitfalls — read before you substitute
- UCPX09 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 45 mm journal over time.
- The standard section of UCPX09 can look adequate at 45 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 UCPX09 is wider and rated above the 2-series part at 45 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, UCPX09 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.
Frequently asked questions
How is UCPX09 locked to the shaft, and how tight should the setscrews be?
The UCX09D1 insert uses two collar setscrews on the 45 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 UCPX09 instead of a flanged unit?
Choose the UCPX09 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 58.7 mm above the 222 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 UCPX09 mounted bearing?
UCPX09 takes a 45 mm shaft (insert UCX09D1, 100 mm OD) and has a unit mass of about 3.2 kg. Housing figures: centre height H 58.7 mm, length L 222 mm, bolt centres J 156 mm, foot holes 20 mm for M16 bolts.
What does the UCPX09 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 45 mm bore. UCPX09 is built from housing PX09 plus insert UCX09D1 (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.