UCFL210 bearing: complete specifications & equivalents
The UCFL210 is a JIS B 1559 radial bearing sized 50 x 90 x 51.6 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 | 50 mm |
| Outer diameter D | 90 mm |
| Width B | 51.6 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 39 kN |
| Basic static load rating C0 | 23.2 kN |
| Fatigue load limit Pu | 1.82 kN |
| Mass | 2000 g |
| Housing height H | 197 mm |
| Housing overall length L | 115 mm |
| Mounting bolt center distance J | 157 mm |
| Mounting hole diameter N | 19 mm |
| Manufacturer designation | UCFL210 |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 2.031 in |
| ISO bore code | 10 |
| 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) | 10 of 25 |
| Bore above smallest UCFL-series size | 38 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL210 | 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 UCFL210 model number is decoded
UCFL210 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC210D1 ball bearing insert pre-assembled in a FL210 cast-iron flange housing. The UCFL210 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 50 mm; FL210 and UC210D1 are the separate housing and insert part numbers inside. Shaft size is 50 mm; the 197 mm overall-height flange is 115 mm long across the rhombus (L), with its two mounting holes on 157 mm centres (J) clearing 19 mm M16 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. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC210D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCFL210 weighs about 2.0 kg.
Typical equipment & failure modes
Common applications
- belt conveyor head, tail and bend pulleys
- industrial fans and blowers
- agricultural augers and bucket elevators
- low-speed heavily loaded pulleys where the static rating governs the selection
Known failure patterns
- fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep
- lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear
- spherical-seat fretting that welds insert to housing and destroys the self-aligning action
Selection pitfalls — read before you substitute
- The standard 2-series insert in UCFL210 is the lightest section at 50 mm — do not substitute it into a position that previously ran an X or 3 unit: the 157 mm mounting may match while the load rating does not.
- As a rhombus flange, UCFL210 pulls against the frame through only two M16 bolts on 157 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
- When ordering covers for UCFL210, note the steel and cast-iron cover executions change the unit mass and envelope but not the 157 mm mounting centres.
- With a 50 mm shaft the M16 foundation bolts of UCFL210 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.
Frequently asked questions
What are the dimensions of an UCFL210 mounted bearing?
UCFL210 takes a 50 mm shaft (insert UC210D1, 90 mm OD) and has a unit mass of about 2.0 kg. Flange figures: height H 197 mm, length L 115 mm, bolt centres J 157 mm, holes 19 mm for M16 bolts.
What does the UCFL210 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 50 mm bore. UCFL210 is built from housing FL210 plus insert UC210D1 (D1 = greasable).
How is UCFL210 locked to the shaft, and how tight should the setscrews be?
The UC210D1 insert uses two collar setscrews on the 50 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 UCFL210 instead of a pillow block?
Choose the UCFL210 two-bolt flange when the 50 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 157 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.