UCFL322 bearing: complete specifications & equivalents
The UCFL322 is a JIS B 1559 radial bearing sized 110 x 240 x 117 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 | 110 mm |
| Outer diameter D | 240 mm |
| Width B | 117 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 227 kN |
| Basic static load rating C0 | 179 kN |
| Fatigue load limit Pu | 10.5 kN |
| Mass | 34000 g |
| Housing height H | 470 mm |
| Housing overall length L | 300 mm |
| Mounting bolt center distance J | 390 mm |
| Mounting hole diameter N | 44 mm |
| Manufacturer designation | UCFL322 |
| 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 | 4.331 in |
|---|---|
| Outer diameter D | 9.449 in |
| Width B | 4.606 in |
| ISO bore code | 22 |
| Radial section height (D−d)/2 | 65 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) | 22 of 25 |
| Bore above smallest UCFL-series size | 98 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL322 | 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 UCFL322 model number is decoded
UCFL322 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC322D1 insert in a JIS B 1559 FL322 housing. On the nameplate, UCFL322 decodes as a UC wide-inner-ring insert in a FL diamond flange, 3-series duty, 110 mm bore; the UC322D1 designation shows the D1 greasable execution. Boundary data for the 110 mm bore: 470 mm high flange, 300 mm long over the rhombus, 390 mm hole centres for M39 fasteners through 44 mm holes; insert OD is 240 mm. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. 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. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UC322D1 insert are 227 kN dynamic and 179 kN static; the assembled UCFL322 weighs about 34.0 kg.
Typical equipment & failure modes
Common applications
- quarry and aggregate screens
- ship-loader and stacker drives
- mining and port conveyor pulleys
- cold-store and winter-outdoor service needing low-temperature grease
Known failure patterns
- housing-foot cracking beside an over-torqued or under-supported foundation bolt
- 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
Selection pitfalls — read before you substitute
- Never weld a bracket to the FL322 housing of UCFL322: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- XL units like UCFL322 (110 mm bore, M39 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.
- The 3-series insert makes UCFL322 the highest-rated unit at 110 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
- As a rhombus flange, UCFL322 pulls against the frame through only two M39 bolts on 390 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
Frequently asked questions
How is UCFL322 locked to the shaft, and how tight should the setscrews be?
The UC322D1 insert uses two collar setscrews on the 110 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 UCFL322 instead of a pillow block?
Choose the UCFL322 two-bolt flange when the 110 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M39 bolts on 390 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
What are the dimensions of an UCFL322 mounted bearing?
UCFL322 takes a 110 mm shaft (insert UC322D1, 240 mm OD) and has a unit mass of about 34.0 kg. Flange figures: height H 470 mm, length L 300 mm, bolt centres J 390 mm, holes 44 mm for M39 bolts.
What does the UCFL322 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 110 mm bore. UCFL322 is built from housing FL322 plus insert UC322D1 (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.