UCFL201 bearing: complete specifications & equivalents
The UCFL201 is a JIS B 1559 radial bearing sized 12 x 32 x 31 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 | 12 mm |
| Outer diameter D | 32 mm |
| Width B | 31 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 14.2 kN |
| Basic static load rating C0 | 6.65 kN |
| Fatigue load limit Pu | 0.505 kN |
| Mass | 500 g |
| Housing height H | 113 mm |
| Housing overall length L | 60 mm |
| Mounting bolt center distance J | 90 mm |
| Mounting hole diameter N | 12 mm |
| Manufacturer designation | UCFL201 |
| 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 | 0.472 in |
|---|---|
| Outer diameter D | 1.26 in |
| Width B | 1.22 in |
| ISO bore code | 01 |
| Radial section height (D−d)/2 | 10 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) | 1 of 25 |
| Bore above smallest UCFL-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL201 | 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 UCFL201 model number is decoded
UCFL201 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC201D1 ball bearing insert pre-assembled in a FL204 cast-iron flange housing. The UCFL201 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 12 mm; FL204 and UC201D1 are the separate housing and insert part numbers inside. Shaft size is 12 mm; the 113 mm overall-height flange is 60 mm long across the rhombus (L), with its two mounting holes on 90 mm centres (J) clearing 12 mm M10 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. In this smallest bore class the units appear on light belt conveyors, food-packaging tables and small fans; the emphasis is on quick bolting-down rather than rating calculations. 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 UC201D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL201 weighs about 0.5 kg.
Typical equipment & failure modes
Common applications
- light belt and roller conveyors
- small packaging and labelling machines
- appliance and HVAC OEM drives
- washdown-duty food and pharmaceutical areas using purge relubrication
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
- Never weld a bracket to the FL204 housing of UCFL201: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- Small units like UCFL201 are often over-tightened simply because they feel light in the hand — use the correct setscrew torque for the 12 mm bore or the points strip out of the shaft.
- The standard 2-series insert in UCFL201 is the lightest section at 12 mm — do not substitute it into a position that previously ran an X or 3 unit: the 90 mm mounting may match while the load rating does not.
- As a rhombus flange, UCFL201 pulls against the frame through only two M10 bolts on 90 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
Frequently asked questions
How is UCFL201 locked to the shaft, and how tight should the setscrews be?
The UC201D1 insert uses two collar setscrews on the 12 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 UCFL201 instead of a pillow block?
Choose the UCFL201 two-bolt flange when the 12 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 90 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
What are the dimensions of an UCFL201 mounted bearing?
UCFL201 takes a 12 mm shaft (insert UC201D1, 32 mm OD) and has a unit mass of about 0.5 kg. Flange figures: height H 113 mm, length L 60 mm, bolt centres J 90 mm, holes 12 mm for M10 bolts.
What does the UCFL201 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 12 mm bore. UCFL201 is built from housing FL204 plus insert UC201D1 (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.