UCFL217 bearing: complete specifications & equivalents
The UCFL217 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 | 8800 g |
| Housing height H | 305 mm |
| Housing overall length L | 190 mm |
| Mounting bolt center distance J | 248 mm |
| Mounting hole diameter N | 25 mm |
| Manufacturer designation | UCFL217 |
| 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 & UCFL-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 UCFL-series | 12 mm |
| Largest outer diameter in UCFL-series | 300 mm |
| Width range across UCFL-series | 31–145 mm |
| Bore position in UCFL-series (smallest first) | 17 of 25 |
| Bore above smallest UCFL-series size | 73 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL217 | 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 UCFL217 model number is decoded
The NTN UCFL217 flanged unit combines a sealed UC217D1 insert with a diamond-shaped FL217 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 2, bore code ending in the 85 mm shaft size; the unit is built from insert UC217D1 and housing FL217. For the frame-face drawing of UCFL217: the two holes are 248 mm apart (J), the rhombus spans 190 mm (L) and 305 mm (H), and M22 (25 mm) bolts clamp it around 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 diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. 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. 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 UC217D1 insert are 92 kN dynamic and 64 kN static; the assembled UCFL217 weighs about 8.8 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
- 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
- lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear
Selection pitfalls — read before you substitute
- The standard 2-series insert in UCFL217 is the lightest section at 85 mm — do not substitute it into a position that previously ran an X or 3 unit: the 248 mm mounting may match while the load rating does not.
- As a rhombus flange, UCFL217 pulls against the frame through only two M22 bolts on 248 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
- The lip seals and slingers on UCFL217 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 FL217 housing of UCFL217: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- At 85 mm bore the 190 mm base of UCFL217 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.
Frequently asked questions
What are the dimensions of an UCFL217 mounted bearing?
UCFL217 takes a 85 mm shaft (insert UC217D1, 150 mm OD) and has a unit mass of about 8.8 kg. Flange figures: height H 305 mm, length L 190 mm, bolt centres J 248 mm, holes 25 mm for M22 bolts.
What does the UCFL217 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 85 mm bore. UCFL217 is built from housing FL217 plus insert UC217D1 (D1 = greasable).
How is UCFL217 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 rhombus flange unit like UCFL217 instead of a pillow block?
Choose the UCFL217 two-bolt flange when the 85 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 248 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
How often should I relubricate an UCFL217 unit?
There is no single interval for UCFL217: the UC217D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy.
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.