NU411-NTN bearing: complete specifications & equivalents

Specification table

Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01

Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); 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 NU411-NTN model number is decoded

In NTN Ball and Roller Bearings CAT.No.2203E, NU411 appears as a 55 mm bore single-row cylindrical roller bearing (154 kN C / 138 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 4,300 r/min grease and 5,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 55 mm bore. Rating life at 154 kN C assumes clean oil and adequate film; the 16.9 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU411.
• If the shaft must be located both ways, do not use NU411 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
• The NU rib arrangement is not interchangeable with another prefix on the same 55 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.
• Open NU411 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.
• If the shaft must be located both ways, do not use NU411 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
• The 154/138 kN ratings, 16.9 kN Pu and 2420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU411 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives.