323164UTG bearing: complete specifications & equivalents
The 323164UTG is a ANSI ABMA 19.2 radial bearing sized 320 x 540 x 176 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 320 mm |
| Outer diameter D | 540 mm |
| Width B | 176 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 3200 kN |
| Basic static load rating C0 | 4900 kN |
| Fatigue load limit Pu | 385 kN |
| Limiting speed (mechanical) | 500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 170000 g |
| Manufacturer designation | NTN 4T-323164UTG |
| 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 | 12.598 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 6.929 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 110 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) | 30 of 39 |
| Bore above smallest 4t-432-series size | 280 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 323164UTG | 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 323164UTG model number is decoded
NTN supplies this 320 mm shaft position as 4T-323164UTG: a factory-adjusted double-row tapered roller bearing whose two roller rows share one double cup, overall width 176 mm. Unlike a pair of single-row bearings, the TDO unit of 4T-323164UTG integrates both rows in one article: the 176 mm overall width and the internal clearance are ground and set by NTN, so there is no field adjustment dimension. Axial capacity is bidirectional because the rows are opposed: 4T-323164UTG locates the shaft in both directions with C0 4900 kN behind the static check of the more heavily loaded row. Because the unit is preset, mounting 4T-323164UTG resembles mounting a double-row spherical or cylindrical bearing: seat the unit, clamp axially to the stated end cover torque, and verify rotation — no end-play measurement is required. The preset clearance suits the standard temperature range; unusual thermal gradients between shaft and housing call for a clearance review against the 320 mm size before ordering 4T-323164UTG.
Typical equipment & failure modes
Common applications
- port-crane hoist and luffing gearboxes
- heavy press and forging-machine drives
- large shredder and recycler main shafts
- power-plant mill and fan shafts
Known failure patterns
- edge loading on one row when the housing seats the double cup cocked across its width
- one-row flaking when a bent shaft concentrates the combined load on a single row of the pair
- overheated running after a field attempt to "tighten up" the factory-set internal clearance
- cage fatigue after continuous running near the grease limiting speed without oil cooling
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- At 320 mm bore the 4T-323164UTG unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 3200 kN C level.
- The 432 heavy plan gives 4T-323164UTG its 176 mm width and 3200 kN rating at the 320 mm bore; do not downgrade to a 430-family unit of the same bore without re-checking C, C0 and the 385 kN Cu.
- Clamping the double cup with a cocked end cover pinches one row: tighten the 540 mm OD clamping uniformly around the circumference.
- Grease packs must leave free volume across the 176 mm width; over-greasing a unit churning near the 710 r/min oil-band speed raises temperature and expels the grease.
- Order by the full 323164UTG code including suffixes — U, X, DX, E1 and UTG variants share the 320 mm bore but are different articles with different internal geometry.
- The 3200/4900 kN ratings and 385 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-323164UTG; 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-323164UTG?
4T-323164UTG is a double-row tapered roller bearing of TDO (back-to-back) construction: 320 mm bore, 540 mm outside diameter and 176 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 3200 kN, C0 4900 kN, Cu 385 kN, grease limiting speed 500 r/min, oil speed 710 r/min, mass about 170 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 320 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-323164UTG 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-323164UTG 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 176 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 323164UTG mean?
Suffix reading on 323164UTG: UTG marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design, printed with the ＊ symbol ahead of the order number; suffixed variants are separate order numbers and are not interchangeable articles.
Why does 4T-323164UTG list two speeds, 500 and 710 r/min?
The lower figure, 500 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-323164UTG at 710 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.