NJ352 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 NJ352 model number is decoded

NJ352 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 260×540×102 mm ISO 15 envelope. Numbering ties NJ352 to its envelope: type code NJ, series NJ300, 260 mm bore; the 540×102 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 1790 kN and C0 2230 kN (C0/C ≈ 1.25) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Rating life at 1790 kN C assumes clean oil and adequate film; the 180 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ352 non-locating position preloads the bearing when the shaft grows.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NJ352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• The NJ rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 540×102 mm envelope matches.
• The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.
• Do not replace NJ352 with a deep-groove ball bearing on rating alone: line contact gives 1790 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
• Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.
• The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ352 (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.