UCPX16 bearing: complete specifications & equivalents
The UCPX16 is a JIS B 1559 radial bearing sized 80 x 170 x 85.7 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 | 80 mm |
| Outer diameter D | 170 mm |
| Width B | 85.7 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 92 kN |
| Basic static load rating C0 | 64 kN |
| Fatigue load limit Pu | 4.6 kN |
| Mass | 14000 g |
| Housing height H | 101.6 mm |
| Housing overall length L | 381 mm |
| Mounting bolt center distance J | 283 mm |
| Mounting hole diameter N | 27 mm |
| Manufacturer designation | UCPX16 |
| 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 | 3.15 in |
|---|---|
| Outer diameter D | 6.693 in |
| Width B | 3.374 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 45 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) | 16 of 25 |
| Bore above smallest UCP-series size | 68 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCPX16 | 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 UCPX16 model number is decoded
UCPX16 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UCX16D1) pre-assembled in a PX16 two-bolt plummer housing. On the nameplate, UCPX16 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 80 mm bore; the UCX16D1 designation shows the D1 greasable execution. Boundary data for the 80 mm bore: housing centre height 101.6 mm, base 381 mm, mounting centres 283 mm for M22 fasteners through 27 mm holes; the UCX16D1 insert itself is 170 mm OD. 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. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UCX16D1 insert are 92 kN dynamic and 64 kN static; the assembled UCPX16 weighs about 14.0 kg.
Typical equipment & failure modes
Common applications
- heavy bulk-handling conveyors
- process fans and induced-draft drives
- quarry feeder and transfer drives
- wet, abrasive or chemically aggressive environments relying on the lip seals and slingers
Known failure patterns
- 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
- fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep
Selection pitfalls — read before you substitute
- Never weld a bracket to the PX16 housing of UCPX16: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- Heavy drives on UCPX16 should have the setscrews re-torqued after the first day; at 80 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.
- The X insert of UCPX16 is wider and rated above the 2-series part at 80 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, UCPX16 needs a prepared horizontal surface at the 101.6 mm centre height: shim both feet with full-width packs so the 381 mm base seats over its full area.
Frequently asked questions
How is UCPX16 locked to the shaft, and how tight should the setscrews be?
The UCX16D1 insert uses two collar setscrews on the 80 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 UCPX16 instead of a flanged unit?
Choose the UCPX16 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 101.6 mm above the 381 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 UCPX16 mounted bearing?
UCPX16 takes a 80 mm shaft (insert UCX16D1, 170 mm OD) and has a unit mass of about 14.0 kg. Housing figures: centre height H 101.6 mm, length L 381 mm, bolt centres J 283 mm, foot holes 27 mm for M22 bolts.
What does the UCPX16 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 80 mm bore. UCPX16 is built from housing PX16 plus insert UCX16D1 (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.