UCFL215 bearing: complete specifications & equivalents
The UCFL215 is a JIS B 1559 radial bearing sized 75 x 130 x 77.8 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 | 75 mm |
| Outer diameter D | 130 mm |
| Width B | 77.8 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 73.5 kN |
| Basic static load rating C0 | 49.5 kN |
| Fatigue load limit Pu | 3.8 kN |
| Mass | 6000 g |
| Housing height H | 275 mm |
| Housing overall length L | 165 mm |
| Mounting bolt center distance J | 225 mm |
| Mounting hole diameter N | 23 mm |
| Manufacturer designation | UCFL215 |
| 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 | 2.953 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 3.063 in |
| ISO bore code | 15 |
| Radial section height (D−d)/2 | 27.5 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) | 15 of 25 |
| Bore above smallest UCFL-series size | 63 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL215 | 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 UCFL215 model number is decoded
For a 75 mm shaft ending at or passing through a vertical frame face, NTN UCFL215 is the diamond-flange answer: UC215D1 insert inside the FL215 cast-iron housing. The UCFL215 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 75 mm; FL215 and UC215D1 are the separate housing and insert part numbers inside. Shaft size is 75 mm; the 275 mm overall-height flange is 165 mm long across the rhombus (L), with its two mounting holes on 225 mm centres (J) clearing 23 mm M20 bolts. 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. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC215D1 insert are 73.5 kN dynamic and 49.5 kN static; the assembled UCFL215 weighs about 6.0 kg.
Typical equipment & failure modes
Common applications
- sugar-mill and fertiliser plant drives
- heavy bulk-handling conveyors
- process fans and induced-draft drives
- vibrating feeder and screen-adjacent positions where setscrew retorque is routine
Known failure patterns
- insert brinelling from hammer mounting or from belt tension applied to a stationary unit
- 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
Selection pitfalls — read before you substitute
- When ordering covers for UCFL215, note the steel and cast-iron cover executions change the unit mass and envelope but not the 225 mm mounting centres.
- UCFL215 at 75 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 275 mm centre height and binds the insert.
- The standard 2-series insert in UCFL215 is the lightest section at 75 mm — do not substitute it into a position that previously ran an X or 3 unit: the 225 mm mounting may match while the load rating does not.
- As a rhombus flange, UCFL215 pulls against the frame through only two M20 bolts on 225 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
- Do not confuse UCFL215 with a bare UC215D1 bearing: replacing only the insert is possible, but the housing FL215 must be unworn and the spherical seat cleaned and coated with anti-seize.
Frequently asked questions
When should I choose a rhombus flange unit like UCFL215 instead of a pillow block?
Choose the UCFL215 two-bolt flange when the 75 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 225 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
What loads can the UCFL215 unit carry?
The UC215D1 insert is rated at 73.5 kN dynamic and 49.5 kN basic static (fatigue load limit 3.8 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately.
What are the dimensions of an UCFL215 mounted bearing?
UCFL215 takes a 75 mm shaft (insert UC215D1, 130 mm OD) and has a unit mass of about 6.0 kg. Flange figures: height H 275 mm, length L 165 mm, bolt centres J 225 mm, holes 23 mm for M20 bolts.
What does the UCFL215 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 75 mm bore. UCFL215 is built from housing FL215 plus insert UC215D1 (D1 = greasable).
How is UCFL215 locked to the shaft, and how tight should the setscrews be?
The UC215D1 insert uses two collar setscrews on the 75 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.
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.