UCFL314 bearing: complete specifications & equivalents
The UCFL314 is a JIS B 1559 radial bearing sized 70 x 150 x 78 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 | 70 mm |
| Outer diameter D | 150 mm |
| Width B | 78 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 115 kN |
| Basic static load rating C0 | 68 kN |
| Fatigue load limit Pu | 5.1 kN |
| Mass | 8600 g |
| Housing height H | 315 mm |
| Housing overall length L | 185 mm |
| Mounting bolt center distance J | 250 mm |
| Mounting hole diameter N | 35 mm |
| Manufacturer designation | UCFL314 |
| 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 | 2.756 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 3.071 in |
| ISO bore code | 14 |
| Radial section height (D−d)/2 | 40 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) | 14 of 25 |
| Bore above smallest UCFL-series size | 58 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL314 | 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 UCFL314 model number is decoded
For a 70 mm shaft ending at or passing through a vertical frame face, NTN UCFL314 is the diamond-flange answer: UC314D1 insert inside the FL314 cast-iron housing. The UCFL314 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 70 mm; FL314 and UC314D1 are the separate housing and insert part numbers inside. Shaft size is 70 mm; the 315 mm overall-height flange is 185 mm long across the rhombus (L), with its two mounting holes on 250 mm centres (J) clearing 35 mm M30 bolts. 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. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Textile and fibre-processing machines use these units on long line-shafting; several bearings share one shaft, and the self-aligning feature prevents one poor bracket from loading its neighbours. A film of anti-seize on the spherical surfaces at assembly prevents fretting corrosion welding insert to housing — the failure mode that turns a five-minute insert swap into a housing replacement. Basic ratings of the UC314D1 insert are 115 kN dynamic and 68 kN static; the assembled UCFL314 weighs about 8.6 kg.
Typical equipment & failure modes
Common applications
- sugar-mill and fertiliser plant drives
- heavy bulk-handling conveyors
- process fans and induced-draft drives
- wet, abrasive or chemically aggressive environments relying on the lip seals and slingers
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 UCFL314, note the steel and cast-iron cover executions change the unit mass and envelope but not the 250 mm mounting centres.
- Heavy drives on UCFL314 should have the setscrews re-torqued after the first day; at 70 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.
- The 3-series insert makes UCFL314 the highest-rated unit at 70 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
- As a rhombus flange, UCFL314 pulls against the frame through only two M30 bolts on 250 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
- Do not confuse UCFL314 with a bare UC314D1 bearing: replacing only the insert is possible, but the housing FL314 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 UCFL314 instead of a pillow block?
Choose the UCFL314 two-bolt flange when the 70 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M30 bolts on 250 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
What loads can the UCFL314 unit carry?
The UC314D1 insert is rated at 115 kN dynamic and 68 kN basic static (fatigue load limit 5.1 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 UCFL314 mounted bearing?
UCFL314 takes a 70 mm shaft (insert UC314D1, 150 mm OD) and has a unit mass of about 8.6 kg. Flange figures: height H 315 mm, length L 185 mm, bolt centres J 250 mm, holes 35 mm for M30 bolts.
What does the UCFL314 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 70 mm bore. UCFL314 is built from housing FL314 plus insert UC314D1 (D1 = greasable).
How is UCFL314 locked to the shaft, and how tight should the setscrews be?
The UC314D1 insert uses two collar setscrews on the 70 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.