432320U bearing: complete specifications & equivalents
The 432320U is a ANSI ABMA 19.2 radial bearing sized 100 x 215 x 162 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 100 mm |
| Outer diameter D | 215 mm |
| Width B | 162 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1090 kN |
| Basic static load rating C0 | 1540 kN |
| Fatigue load limit Pu | 164 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 26800 g |
| Manufacturer designation | NTN 4T-432320U |
| Standard | ANSI ABMA 19.2 |
| Catalog version | NTN 2203E 2026-09-25 |
| Last verified | 2026-10-01 |
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.
Dimensions in inches & 4t-432-series range
| Bore d | 3.937 in |
|---|---|
| Outer diameter D | 8.465 in |
| Width B | 6.378 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 57.5 mm |
| Smallest bore in 4t-432-series | 40 mm |
| Largest outer diameter in 4t-432-series | 790 mm |
| Width range across 4t-432-series | 46–266 mm |
| Bore position in 4t-432-series (smallest first) | 13 of 39 |
| Bore above smallest 4t-432-series size | 60 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 432320U | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 432320U model number is decoded
For a 100 mm shaft needing a compact two-direction thrust location, NTN lists 4T-432320U, a TDO double-row 4T unit of 1090 kN C and 1540 kN C0 in the heavy-duty 432-family TDO double-row series. Reading the designation: the last two digits 20 are the bore code, ×5 = 100 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. Selection: C 1090 kN against C0 1540 kN gives a C0/C ratio of 1.41; the two rows of 4T-432320U share the combined load as one bearing position. TDO construction means the two cone assemblies of 4T-432320U 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 100 mm shaft. With a rotating shaft a k5/m5 seat on the 100 mm journal and a located cup in the housing are typical practice for 4T-432320U.
Typical equipment & failure modes
Common applications
- crusher and screening-plant main shafts
- large fan and blower shafts with thrust reversal
- steel-plant roller table and conveyor drives
- marine winch and deck-machinery shafts
Known failure patterns
- edge loading on one row when the housing seats the double cup cocked across its width
- preload loss and hammering noise when the cup clamping loosens and the unit gains axial float
- brinelling of both rows from a mounting blow transmitted through the roller complements
- cage fatigue after continuous running near the grease limiting speed without oil cooling
- water-induced pitting when washdown reaches the open unit without external seals
Selection pitfalls — read before you substitute
- Mount the 100 mm unit by induction heating (max 120 °C); at 26.8 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 432 heavy plan gives 4T-432320U its 162 mm width and 1090 kN rating at the 100 mm bore; do not downgrade to a 430-family unit of the same bore without re-checking C, C0 and the 164 kN Cu.
- Grease packs must leave free volume across the 162 mm width; over-greasing a unit churning near the 2,000 r/min oil-band speed raises temperature and expels the grease.
- The 1090 kN C already includes two-row load sharing — do not double it when pairing the unit with a floating bearing in the L10 calculation.
- The 1090 kN C already includes two-row load sharing — do not double it when pairing the unit with a floating bearing in the L10 calculation.
- The 1090/1540 kN ratings and 164 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-432320U; internal geometry legitimately differs between manufacturers, so re-verify ratings, clearance class and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 4T-432320U?
4T-432320U is a double-row tapered roller bearing of TDO (back-to-back) construction: 100 mm bore, 215 mm outside diameter and 162 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 1090 kN, C0 1540 kN, Cu 164 kN, grease limiting speed 1,500 r/min, oil speed 2,000 r/min, mass about 26.8 kg. It is an open, preset-clearance unit with pressed-steel cages.
What is the difference between the NTN 430 and 432 double-row series at 100 mm bore?
Both are TDO double-row tapered roller units, but 430 is the light plan and 432 the heavy plan: at the same bore the 432 execution is wider and heavier with higher load ratings. 4T-432320U belongs to the heavy-duty 432-family TDO double-row series. Large sizes continue the plans as 4130/4131/4230/4231 (430 family) and 3230/3231 (432 family).
Can the internal clearance of 4T-432320U be adjusted at mounting?
No. The TDO unit — two cone assemblies against one double cup — is ground and set by NTN at the factory, and the 162 mm overall width is the finished dimension. Mounting sets no end play: seat the unit square, clamp the cup uniformly and verify free rotation. Field re-adjustment overloads one row.
What do the suffix letters on 432320U mean?
Suffix reading on 432320U: U marks the uprated/reinforced internal design, a separate order number with higher capacity than the basic execution; suffixed variants are separate order numbers and are not interchangeable articles.
Why does 4T-432320U list two speeds, 1,500 and 2,000 r/min?
The lower figure, 1,500 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-432320U at 2,000 r/min because oil removes heat from both roller rows better — the housing feed must reach both rows through the double cup.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN 2203E 2026-09-25 on 2026-10-01. Read our editorial & correction policy.