UCFLX10 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 UCFLX10 model number is decoded

For a 50 mm shaft ending at or passing through a vertical frame face, NTN UCFLX10 is the diamond-flange answer: UCX10D1 insert inside the FLX10 cast-iron housing. On the nameplate, UCFLX10 decodes as a UC wide-inner-ring insert in a FL diamond flange, X-series duty, 50 mm bore; the UCX10D1 designation shows the D1 greasable execution. Boundary data for the 50 mm bore: 216 mm high flange, 133 mm long over the rhombus, 184 mm hole centres for M16 fasteners through 19 mm holes; insert OD is 110 mm. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. 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. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UCX10D1 insert are 48 kN dynamic and 29.2 kN static; the assembled UCFLX10 weighs about 3.0 kg.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The lip seals and slingers on UCFLX10 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.
• Never weld a bracket to the FLX10 housing of UCFLX10: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
• The standard section of UCFLX10 can look adequate at 50 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.
• The X insert of UCFLX10 is wider and rated above the 2-series part at 50 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.
• As a rhombus flange, UCFLX10 pulls against the frame through only two M16 bolts on 184 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.