32018XU 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 32018XU model number is decoded

NTN supplies this 90 mm bore tapered roller position as 32018XU: one cone assembly, one cup, line-contact rollers and a steel cage, rated 187 kN basic dynamic and 270 kN static on the low-section 32000 family tuned for low friction. The last two digits 18 are the ISO bore code, ×5 = 90 mm (codes 00–03 use the 10/12/15/17 exception table) under the ISO 355 numbering; the 32 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. A tapered roller bearing reacts combined radial and one-direction axial load; NTN mounts 32018XU cone and cup separately and adjusts end play or preload against a second bearing, so the arrangement locates the shaft in both directions. Selection: C 187 kN against C0 270 kN gives a C0/C ratio of 1.44 for the 90 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. Open 4T bearings need application seals; without them the grease at the cone rib of 32018XU washes out and the rib/roller-end contact smears on the first wet or dusty shift.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 90 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 1780 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
• The thin 32 mm section of 32018XU is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 90 mm bore smears the roller ends against the rib.
• The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32018XU by size alone can deliver the wrong contact-angle execution for a pinion position.
• Replacing one half of an adjusted pair without resetting end play negates the 32 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
• Do not confuse T (32 mm assembled width of cone + cup) with the cone width when drawing spacers; an abutment sized to T instead of the ring width leaves the cup unseated.
• The 187/270 kN ratings and 31.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32018XU (ISO 355 3CC); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.