UCFL218 bearing: complete specifications & equivalents
The UCFL218 is a JIS B 1559 radial bearing sized 90 x 160 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 | 90 mm |
| Outer diameter D | 160 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 | 11000 g |
| Housing height H | 320 mm |
| Housing overall length L | 205 mm |
| Mounting bolt center distance J | 265 mm |
| Mounting hole diameter N | 25 mm |
| Manufacturer designation | UCFL218 |
| 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 | 3.543 in |
|---|---|
| Outer diameter D | 6.299 in |
| Width B | 3.78 in |
| ISO bore code | 18 |
| Radial section height (D−d)/2 | 35 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) | 18 of 25 |
| Bore above smallest UCFL-series size | 78 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL218 | 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 UCFL218 model number is decoded
In NTN's mounted-bearing range, UCFL218 is the two-bolt rhombus flange option for a 90 mm shaft: insert UC218D1, housing FL218, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL218 means the FL218 housing carrying the UC218D1 insert, with the last two digits denoting the 90 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 320 mm flange height, L 205 mm across the ears, J 265 mm between the 25 mm holes, and a 90 mm shaft through the 160 mm OD UC218D1 insert. 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. 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. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC218D1 insert are 106 kN dynamic and 71.5 kN static; the assembled UCFL218 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
- fan drives where belt tension, not transmitted torque, sets the radial load
Known failure patterns
- 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
- housing-foot cracking beside an over-torqued or under-supported foundation bolt
Selection pitfalls — read before you substitute
- The standard 2-series insert in UCFL218 is the lightest section at 90 mm — do not substitute it into a position that previously ran an X or 3 unit: the 265 mm mounting may match while the load rating does not.
- As a rhombus flange, UCFL218 pulls against the frame through only two M22 bolts on 265 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
- When ordering covers for UCFL218, note the steel and cast-iron cover executions change the unit mass and envelope but not the 265 mm mounting centres.
- UCFL218 at 90 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 320 mm centre height and binds the insert.
Frequently asked questions
What are the dimensions of an UCFL218 mounted bearing?
UCFL218 takes a 90 mm shaft (insert UC218D1, 160 mm OD) and has a unit mass of about 11.0 kg. Flange figures: height H 320 mm, length L 205 mm, bolt centres J 265 mm, holes 25 mm for M22 bolts.
What does the UCFL218 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 90 mm bore. UCFL218 is built from housing FL218 plus insert UC218D1 (D1 = greasable).
How is UCFL218 locked to the shaft, and how tight should the setscrews be?
The UC218D1 insert uses two collar setscrews on the 90 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 UCFL218 instead of a pillow block?
Choose the UCFL218 two-bolt flange when the 90 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 265 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
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.