UCFL310 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 UCFL310 model number is decoded

The NTN UCFL310 flanged unit combines a sealed UC310D1 insert with a diamond-shaped FL310 cast-iron housing that bolts flat against a machine frame. 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 50 mm bore. Key mounting figures: flange height H = 240 mm, overall length L = 140 mm across the diamond, bolt centres J = 187 mm, and each ear takes a 25 mm (M22) fastener for the 50 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. 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. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UC310D1 insert are 68.5 kN dynamic and 38.5 kN static; the assembled UCFL310 weighs about 4.1 kg.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The standard section of UCFL310 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 3-series insert makes UCFL310 the highest-rated unit at 50 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
• As a rhombus flange, UCFL310 pulls against the frame through only two M22 bolts on 187 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
• The D1 suffix on UC310D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL310 on site accepts relubrication.
• Self-aligning is not the same as free to move: the UC310D1 insert of UCFL310 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.