UCFL324 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 UCFL324 model number is decoded

UCFL324 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC324D1 ball bearing insert pre-assembled in a FL324 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 3 code identifies the duty series and the final two digits encode the 120 mm bore. Key mounting figures: flange height H = 520 mm, overall length L = 330 mm across the diamond, bolt centres J = 430 mm, and each ear takes a 47 mm (M42) fastener for the 120 mm shaft. 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. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. On industrial centrifugal fans this size is standard at both shaft ends; fan loads are light but belt tension is not, and the cast housing dissipates the heat conducted out of the insert. Shim under the feet, never file the sole: full-area shim packs on both sides keep the bolt clamp load spread across the base, while a single thin shim pivots the housing and preloads the bearing. Basic ratings of the UC324D1 insert are 229 kN dynamic and 185 kN static; the assembled UCFL324 weighs about 48.0 kg.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The 3-series insert makes UCFL324 the highest-rated unit at 120 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
• As a rhombus flange, UCFL324 pulls against the frame through only two M42 bolts on 430 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
• Self-aligning is not the same as free to move: the UC324D1 insert of UCFL324 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.
• At 120 mm bore, rigging and alignment dominate the UCFL324 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted.