UCP217 bearing: complete specifications & equivalents
The UCP217 is a JIS B 1559 radial bearing sized 85 x 150 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 | 85 mm |
| Outer diameter D | 150 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 | 11000 g |
| Housing height H | 95.2 mm |
| Housing overall length L | 310 mm |
| Mounting bolt center distance J | 247 mm |
| Mounting hole diameter N | 25 mm |
| Manufacturer designation | UCP217 |
| 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 | 5.906 in |
| Width B | 3.374 in |
| ISO bore code | 17 |
| Radial section height (D−d)/2 | 32.5 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 |
|---|---|---|---|
| UCP217 | 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 UCP217 model number is decoded
In NTN's mounted-ball-bearing range, UCP217 is the classic upright pillow block for a 85 mm shaft: insert UC217D1, housing P217, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 85 mm bore. Key mounting figures: centre height H = 95.2 mm, overall base length L = 310 mm, bolt-hole spacing J = 247 mm, and each of the two feet takes a 25 mm (M20) fastener for the 85 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. 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. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC217D1 insert are 92 kN dynamic and 64 kN static; the assembled UCP217 weighs about 11.0 kg.
Typical equipment & failure modes
Common applications
- quarry feeder and transfer drives
- sawmill arbors and feed rolls
- cement and clinker handling
- 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
- The standard 2-series insert in UCP217 is the lightest section at 85 mm — do not substitute it into a position that previously ran an X or 3 unit: the 247 mm mounting may match while the load rating does not.
- As a pillow block, UCP217 needs a prepared horizontal surface at the 95.2 mm centre height: shim both feet with full-width packs so the 310 mm base seats over its full area.
- Self-aligning is not the same as free to move: the UC217D1 insert of UCP217 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.
- UCP217 at 85 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 95.2 mm centre height and binds the insert.
Frequently asked questions
What are the dimensions of an UCP217 mounted bearing?
UCP217 takes a 85 mm shaft (insert UC217D1, 150 mm OD) and has a unit mass of about 11.0 kg. Housing figures: centre height H 95.2 mm, length L 310 mm, bolt centres J 247 mm, foot holes 25 mm for M20 bolts.
What does the UCP217 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 85 mm bore. UCP217 is built from housing P217 plus insert UC217D1 (D1 = greasable).
How is UCP217 locked to the shaft, and how tight should the setscrews be?
The UC217D1 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.
When should I choose a pillow block like UCP217 instead of a flanged unit?
Choose the UCP217 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 95.2 mm above the 310 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.