N326 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 N326 model number is decoded

N326 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 130×280×58 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 130 mm, with 280 mm OD and 58 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 167 mm and Ew 243 mm — the envelope inside the 130/280 mm bore/OD where the rollers actually run. The 4.8 kN-per-mm-bore figure (620 kN over 130 mm) lets a N326 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N326 non-locating position preloads the bearing when the shaft grows.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g N326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.
• Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.
• Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for N326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
• The N rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.
• The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N326 (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.