NJ409-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 NJ409-NTN model number is decoded

For pure radial duty on a 45 mm shaft NTN supplies NJ409: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 5,100 r/min on grease and 6,000 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ409 floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NJ409 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 119 kN C assumes clean oil and adequate film; the 12.4 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NJ409; an oversized radius locks the ring on its face and tilts the 29 mm-wide seat.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 45 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 NJ409.
• Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NJ400 series code before substituting, because housing and shoulder geometry will not interchange.
• Open NJ409 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 45 mm contact.
• Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.
• Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NJ400 series code before substituting, because housing and shoulder geometry will not interchange.
• The 119/102 kN ratings, 12.4 kN Pu and 1580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ409 (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.