432311U bearing: complete specifications & equivalents

Specification table

Source: catalog reference (NTN 2203E 2026-09-25) · extracted 2026-10-01

Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN 2203E 2026-09-25); 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 432311U model number is decoded

4T-432311U belongs to the heavy-duty 432-family TDO double-row series of NTN double-row tapered roller bearings; the unit is mounted as one article and its internal clearance is set at the factory, not on the shaft. Reading the designation: the last two digits 11 are the bore code, ×5 = 55 mm (codes 00–03 use the 10/12/15/17 exception table); the leading digits place the bearing in the heavy-duty 432-family TDO double-row series. Axial capacity is bidirectional because the rows are opposed: 4T-432311U locates the shaft in both directions with C0 550 kN behind the static check of the more heavily loaded row. TDO construction means the two cone assemblies of 4T-432311U face away from each other inside one double cup: the load lines diverge outward, giving a wide effective spread and high moment stiffness for the 55 mm shaft. The open unit carries no seals; the housing of 4T-432311U must provide sealing and the grease fill or oil feed to both rows.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Gearbox positions of this 55 mm class rely on the preset clearance of 4T-432311U; shimming or nut-tightening the unit like a single-row pair overruns the factory setting and runs the rows hot.
• The 432 heavy plan gives 4T-432311U its 97 mm width and 410 kN rating at the 55 mm bore; do not downgrade to a 430-family unit of the same bore without re-checking C, C0 and the 67 kN Cu.
• Never interchange a TDO double-row unit with two single-row bearings of similar size: the 97 mm width, load spread and clearance logic of 4T-432311U are unit-specific.
• Open 4T-432311U units have no seals: the housing must seal both rows or the 2,700 r/min grease figure is meaningless once contamination enters.
• An unloaded 4T-432311U near 2,700 r/min lets rollers skid; ensure a minimum load or light spring preload on high-speed positions.
• The 410/550 kN ratings and 67 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-432311U; internal geometry legitimately differs between manufacturers, so re-verify ratings, clearance class and suffix before substituting another make on a rated drive.