NU236 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 NU236 model number is decoded

NTN lists NU236 on the 180×320 mm envelope, 52 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,000 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU236 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU236 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 17300 g for the 180×320×52 mm NU236 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU236.

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 NU236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• Open NU236 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.
• 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.
• 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 NU236 as printed, not to the bare size.
• Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.
• The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU236 (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.