NU2340 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 NU2340 model number is decoded

NTN lists NU2340 on the 200×420 mm envelope, 138 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,400 r/min. Numbering ties NU2340 to its envelope: type code NU, series NU2300, 200 mm bore; the 420×138 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2340. The 200 mm (7.874 in) bore and 420 mm (16.535 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 138 mm-wide ring. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 200 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 90700 g NU2340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.
• If the shaft must be located both ways, do not use NU2340 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
• Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.
• Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.
• The 1680/2240 kN ratings, 195 kN Pu and 90700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2340 (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.