31322XU 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 31322XU model number is decoded

31322XU is the NTN 4T catalogue entry for a 110×240×63 mm metric tapered roller bearing — separable cone and cup, designed for combined radial and axial load as an individually adjusted bearing. Reading the designation: the leading five digits follow the ISO 355 metric plan (dimension family plus two-digit bore code), and 31322XU resolves to 110 mm bore; the NTN factory mark 4T is stamped on cone and cup but is a brand mark, not a size code, so the catalogue sku is printed without it. Suffix reading on 31322XU: XU combines the X ISO boundary section with the U uprated internal design; U marks the reinforced/uprated internal design of the bare number, a separate order number with higher load capacity than the basic execution; the suffix is part of the order number and the variants are not interchangeable articles. Selection: C 480 kN against C0 535 kN gives a C0/C ratio of 1.11 for the 110 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. Mount the 110 mm-bore cone on the shaft first (induction heat, max 120 °C), fit the cup square in its housing, then set preload or end play; never drive the cup home through the rollers of 31322XU.

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 11900 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
• The steeper contact angle of the steep-angle 31300 family for high axial load share 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.
• Open 31322XU units have no seals: a wheel-hub or gearbox application needs external sealing or the 1,600 r/min grease figure is meaningless once water reaches the cone rib.
• The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 31322XU by size alone can deliver the wrong contact-angle execution for a pinion position.
• ISO 355 makes the 110×240 mm envelope interchangeable but not the ratings: NTN prints 480/535 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
• The 480/535 kN ratings and 55 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 31322XU (ISO 355 7GB); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.