UCPX17 bearing: complete specifications & equivalents
The UCPX17 is a JIS B 1559 radial bearing sized 85 x 180 x 96 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 | 85 mm |
| Outer diameter D | 180 mm |
| Width B | 96 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 106 kN |
| Basic static load rating C0 | 71.5 kN |
| Fatigue load limit Pu | 5 kN |
| Mass | 15000 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 | UCPX17 |
| 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 | 3.346 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 3.78 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 47.5 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) | 17 of 25 |
| Bore above smallest UCP-series size | 73 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCPX17 | 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 UCPX17 model number is decoded
The NTN UCPX17 unit pairs a UCX17D1 sealed ball bearing insert with a one-piece PX17 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCPX17 number follows NTN's mounted-unit convention: housing letter P, X-series section, bore code for 85 mm; PX17 and UCX17D1 are the separate housing and insert part numbers inside. Shaft size is 85 mm; the cast base stands 101.6 mm to the shaft centre (H), is 381 mm long overall (L), and the two foundation holes on 283 mm centres (J) clear 27 mm M22 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. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. 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 UCX17D1 insert are 106 kN dynamic and 71.5 kN static; the assembled UCPX17 weighs about 15.0 kg.
Typical equipment & failure modes
Common applications
- process fans and induced-draft drives
- quarry feeder and transfer drives
- sawmill arbors and feed rolls
- long line-shafting where several units must share a straight reference
Known failure patterns
- insert brinelling from hammer mounting or from belt tension applied to a stationary unit
- over-greasing that churns the charge, overheats the bearing and blows the seal lip
- cracked cast ear from mounting on an uneven face and pulling one bolt fully first
Selection pitfalls — read before you substitute
- UCPX17 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 85 mm journal over time.
- At 85 mm bore the 381 mm base of UCPX17 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.
- The X insert of UCPX17 is wider and rated above the 2-series part at 85 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, UCPX17 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.
- At replacement time, measure the 85 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCPX17 creep identically to the old one.
Frequently asked questions
When should I choose a pillow block like UCPX17 instead of a flanged unit?
Choose the UCPX17 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 loads can the UCPX17 unit carry?
The UCX17D1 insert is rated at 106 kN dynamic and 71.5 kN basic static (fatigue load limit 5 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately.
What are the dimensions of an UCPX17 mounted bearing?
UCPX17 takes a 85 mm shaft (insert UCX17D1, 180 mm OD) and has a unit mass of about 15.0 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 UCPX17 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 85 mm bore. UCPX17 is built from housing PX17 plus insert UCX17D1 (D1 = greasable).
How is UCPX17 locked to the shaft, and how tight should the setscrews be?
The UCX17D1 insert uses two collar setscrews on the 85 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.
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.