UCFL209 bearing: complete specifications & equivalents
The UCFL209 is a JIS B 1559 radial bearing sized 45 x 85 x 49.2 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 | 45 mm |
| Outer diameter D | 85 mm |
| Width B | 49.2 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 36 kN |
| Basic static load rating C0 | 20.4 kN |
| Fatigue load limit Pu | 1.6 kN |
| Mass | 1800 g |
| Housing height H | 188 mm |
| Housing overall length L | 108 mm |
| Mounting bolt center distance J | 148 mm |
| Mounting hole diameter N | 19 mm |
| Manufacturer designation | UCFL209 |
| 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 | 1.772 in |
|---|---|
| Outer diameter D | 3.346 in |
| Width B | 1.937 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 20 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) | 9 of 25 |
| Bore above smallest UCFL-series size | 33 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL209 | 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 UCFL209 model number is decoded
In NTN's mounted-bearing range, UCFL209 is the two-bolt rhombus flange option for a 45 mm shaft: insert UC209D1, housing FL209, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL209 means the FL209 housing carrying the UC209D1 insert, with the last two digits denoting the 45 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 188 mm flange height, L 108 mm across the ears, J 148 mm between the 19 mm holes, and a 45 mm shaft through the 85 mm OD UC209D1 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. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. 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 UC209D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCFL209 weighs about 1.8 kg.
Typical equipment & failure modes
Common applications
- agricultural augers and bucket elevators
- small crushers and screening feeds
- textile line-shafting
- continuous one-direction running where creep risk concentrates on the setscrew points
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
- Never weld a bracket to the FL209 housing of UCFL209: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- The standard section of UCFL209 can look adequate at 45 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.
- The standard 2-series insert in UCFL209 is the lightest section at 45 mm — do not substitute it into a position that previously ran an X or 3 unit: the 148 mm mounting may match while the load rating does not.
- As a rhombus flange, UCFL209 pulls against the frame through only two M16 bolts on 148 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
Frequently asked questions
How is UCFL209 locked to the shaft, and how tight should the setscrews be?
The UC209D1 insert uses two collar setscrews on the 45 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 UCFL209 instead of a pillow block?
Choose the UCFL209 two-bolt flange when the 45 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 148 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
What are the dimensions of an UCFL209 mounted bearing?
UCFL209 takes a 45 mm shaft (insert UC209D1, 85 mm OD) and has a unit mass of about 1.8 kg. Flange figures: height H 188 mm, length L 108 mm, bolt centres J 148 mm, holes 19 mm for M16 bolts.
What does the UCFL209 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 45 mm bore. UCFL209 is built from housing FL209 plus insert UC209D1 (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.