N228 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 N228 model number is decoded

N228 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 140×250×42 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 250 mm OD and 42 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 2,700 r/min grease and 3,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. The 140 mm (5.512 in) bore and 250 mm (9.843 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 42 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 140 mm shaft.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g N228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• The 42 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 140 mm inner ring.
• Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for N228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
• Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for N228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
• If the shaft must be located both ways, do not use N228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
• The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N228 (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.