NJ234E 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 NJ234E model number is decoded

NJ234E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 670 kN dynamic rating in the 170 mm bore. Numbering ties NJ234E to its envelope: type code NJ, series NJ200, 170 mm bore; the 310×52 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NJ234E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 670 kN C assumes clean oil and adequate film; the 75 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 170 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 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NJ234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/800 kN pair here belongs to NJ234E as printed, not to the bare size.
• The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/800 kN pair here belongs to NJ234E as printed, not to the bare size.
• The 52 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 170 mm inner ring.
• Do not replace NJ234E with a deep-groove ball bearing on rating alone: line contact gives 670 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
• The 670/800 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ234E (E high-capacity 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.