NJ1052 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 NJ1052 model number is decoded

NJ1052 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 260×400×65 mm ISO 15 envelope. Numbering ties NJ1052 to its envelope: type code NJ, series NJ1000, 260 mm bore; the 400×65 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 715 kN and C0 1000 kN (C0/C ≈ 1.40) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,900 r/min for continuously high-duty 260 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 260 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 260 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 28700 g NJ1052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• Do not replace NJ1052 with a deep-groove ball bearing on rating alone: line contact gives 715 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
• If the shaft must be located both ways, do not use NJ1052 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
• The 65 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.
• Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1052 skids at 1,600 r/min and fails by smearing long before L10 fatigue.
• The 715/1000 kN ratings, 85 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1052 (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.