32224U 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 32224U model number is decoded

32224U belongs to the NTN metric 4T tapered roller range (heavy-section 32200 family); the open bearing leaves sealing to the application and is normally ordered and mounted as an adjustable matched pair. The last two digits 24 are the ISO bore code, ×5 = 120 mm (codes 00–03 use the 10/12/15/17 exception table) under the ISO 355 numbering; the 61.5 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. Individually mounted, 32224U takes axial force in one direction only; two bearings are arranged face-to-face (X) or back-to-back (O) according to the moment stiffness and misalignment the shaft requires. Selection: C 510 kN against C0 680 kN gives a C0/C ratio of 1.33 for the 120 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 120 mm pair is misadjusted and the 61.5 mm T set will edge-load in service.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 120 mm bore the 32224U set is adjusted with hydraulic nuts on large mill and wind positions; follow the drive-up angle/end-play procedure, because manual torque methods cannot control preload at the 510 kN C level.
• The heavy-section 32200 family at 120 mm bore (215×61.5 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,200 r/min oil ceiling.
• The 47.5 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32224U or the ring will bottom out on the radius instead of the shoulder face.
• On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 120 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
• Never fit the 120 mm cone by hammering the 215 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
• The 510/680 kN ratings and 71.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32224U (ISO 355 4FD); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.