N236 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 N236 model number is decoded

In NTN Ball and Roller Bearings CAT.No.2203E, N236 appears as a 180 mm bore single-row cylindrical roller bearing (550 kN C / 675 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. 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 180 mm, with 320 mm OD and 52 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 2,000 r/min grease and 2,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. The 3.1 kN-per-mm-bore figure (550 kN over 180 mm) lets a N236 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g N236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• The 70.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.
• Do not replace N236 with a deep-groove ball bearing on rating alone: line contact gives 550 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 EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 550/675 kN pair here belongs to N236 as printed, not to the bare size.
• If the shaft must be located both ways, do not use N236 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
• The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N236 (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.