UCFL312 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 UCFL312 model number is decoded

NTN delivers UCFL312 as a matched unit — the UC312D1 insert is locked into the FL312 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL312 means the FL312 housing carrying the UC312D1 insert, with the last two digits denoting the 60 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 270 mm flange height, L 160 mm across the ears, J 212 mm between the 31 mm holes, and a 60 mm shaft through the 130 mm OD UC312D1 insert. 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. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC312D1 insert are 90.5 kN dynamic and 52 kN static; the assembled UCFL312 weighs about 5.7 kg.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• As a rhombus flange, UCFL312 pulls against the frame through only two M27 bolts on 212 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
• At replacement time, measure the 60 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCFL312 creep identically to the old one.
• UCFL312 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 60 mm journal over time.
• At 60 mm bore the 160 mm base of UCFL312 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.
• The 3-series insert makes UCFL312 the highest-rated unit at 60 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.