30322U 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 30322U model number is decoded

For a 110 mm shaft with a thrust component, NTN lists 30322U, a metric 4T tapered roller bearing of 530 kN C and 585 kN C0 inside the 240 mm OD, 54.5 mm-wide assembled set. The last two digits 22 are the ISO bore code, ×5 = 110 mm (codes 00–03 use the 10/12/15/17 exception table) under the ISO 355 numbering; the 54.5 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. The 65.0 mm radial section carries the roller complement across the 110–240 mm envelope; section and contact angle differ between NTN metric families even at the same bore, so 302/322/323 are not drop-in swaps. The fatigue load limit Pu printed for 30322U is 60 kN; in the adjusted-life equation that is the equivalent-load floor below which high reliability is expected even under contamination. When pairing 30322U with a second tapered bearing, keep the matched arrangement clean: a single stray grit particle between cup and housing changes preload faster than the adjustment range can correct.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 110 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 11100 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
• The steeper contact angle of the large-OD 30300 family with the steeper contact angle raises axial capacity but lowers the speed ceiling against a 302/322 bearing at 110 mm bore; do not swap to the lighter family without re-checking the 1,600 r/min grease limit and the thrust load split.
• ISO 355 makes the 110×240 mm envelope interchangeable but not the ratings: NTN prints 530/585 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
• Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 110 mm shoulder geometry, because retrofitting flips the cups.
• The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 30322U by size alone can deliver the wrong contact-angle execution for a pinion position.
• The 530/585 kN ratings and 60 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 30322U (ISO 355 2GB); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.