UCFL204 bearing: complete specifications & equivalents

Specification table

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.

Cross references & equivalents

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 UCFL204 model number is decoded

NTN delivers UCFL204 as a matched unit — the UC204D1 insert is locked into the FL204 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL204 means the FL204 housing carrying the UC204D1 insert, with the last two digits denoting the 20 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 113 mm flange height, L 60 mm across the ears, J 90 mm between the 12 mm holes, and a 20 mm shaft through the 47 mm OD UC204D1 insert. 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. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC204D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL204 weighs about 0.4 kg.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• As a rhombus flange, UCFL204 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.
• Do not confuse UCFL204 with a bare UC204D1 bearing: replacing only the insert is possible, but the housing FL204 must be unworn and the spherical seat cleaned and coated with anti-seize.
• When ordering covers for UCFL204, note the steel and cast-iron cover executions change the unit mass and envelope but not the 90 mm mounting centres.
• Small units like UCFL204 are often over-tightened simply because they feel light in the hand — use the correct setscrew torque for the 20 mm bore or the points strip out of the shaft.
• The standard 2-series insert in UCFL204 is the lightest section at 20 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.