432317U bearing: complete specifications & equivalents
The 432317U is a ANSI ABMA 19.2 radial bearing sized 85 x 180 x 137 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 85 mm |
| Outer diameter D | 180 mm |
| Width B | 137 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 765 kN |
| Basic static load rating C0 | 1050 kN |
| Fatigue load limit Pu | 118 kN |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 15400 g |
| Manufacturer designation | NTN 4T-432317U |
| 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 | 3.346 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 5.394 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 47.5 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) | 10 of 39 |
| Bore above smallest 4t-432-series size | 45 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 432317U | 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 432317U model number is decoded
4T-432317U is the NTN 4T catalogue entry for a 85×180×137 mm double-row tapered roller bearing — the TDO arrangement reacts radial load plus thrust in both directions without a second bearing. Suffix reading on 432317U: 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. The 9.0 kN of dynamic capacity per millimetre of bore summarises the 765 kN rating over the 85 mm bore — compare substitution candidates on this ratio and on the 137 mm width. TDO construction means the two cone assemblies of 4T-432317U 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 85 mm shaft. Moment loads are reacted by the wide row spread of the TDO unit; if the shaft also carries a floating bearing, keep the float clear of 4T-432317U's locating position.
Typical equipment & failure modes
Common applications
- steel-plant roller table and conveyor drives
- marine winch and deck-machinery shafts
- bulk-handling stacker/reclaimer travel drives
- large mixer and agitator shafts
Known failure patterns
- roller large-end smearing against the cone ribs when one row of the unit runs starved of lubricant
- 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 85 mm unit by induction heating (max 120 °C); at 15.4 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 432 heavy plan gives 4T-432317U its 137 mm width and 765 kN rating at the 85 mm bore; do not downgrade to a 430-family unit of the same bore without re-checking C, C0 and the 118 kN Cu.
- Clamping the double cup with a cocked end cover pinches one row: tighten the 180 mm OD clamping uniformly around the circumference.
- The 47.5 mm section leaves little room for oversized shaft fillets; follow the 2203E chamfer table for 4T-432317U or the cones bottom out on the radius.
- The 765 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 765/1050 kN ratings and 118 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-432317U; 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-432317U?
4T-432317U is a double-row tapered roller bearing of TDO (back-to-back) construction: 85 mm bore, 180 mm outside diameter and 137 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 765 kN, C0 1050 kN, Cu 118 kN, grease limiting speed 1,800 r/min, oil speed 2,400 r/min, mass about 15.4 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 85 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-432317U 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-432317U 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 137 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 432317U mean?
Suffix reading on 432317U: 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-432317U list two speeds, 1,800 and 2,400 r/min?
The lower figure, 1,800 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-432317U at 2,400 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.