32044XUUTG bearing: complete specifications & equivalents
The 32044XUUTG is a ISO 355 radial bearing sized 220 x 340 x 76 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 220 mm |
| Outer diameter D | 340 mm |
| Width B | 76 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1180 kN |
| Basic static load rating C0 | 1690 kN |
| Fatigue load limit Pu | 152 kN |
| Limiting speed (mechanical) | 960 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 24900 g |
| Manufacturer designation | NTN 32044XUUTG |
| Standard | ISO 355 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
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.
Dimensions in inches & 32000-series range
| Bore d | 8.661 in |
|---|---|
| Outer diameter D | 13.386 in |
| Width B | 2.992 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 60 mm |
| Smallest bore in 32000-series | 20 mm |
| Largest outer diameter in 32000-series | 650 mm |
| Width range across 32000-series | 15–130 mm |
| Bore position in 32000-series (smallest first) | 32 of 43 |
| Bore above smallest 32000-series size | 200 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32044XUUTG | 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 32044XUUTG model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 32044XUUTG denotes the low-section 32000 family tuned for low friction of metric tapered roller bearings, 220 mm bore, 340 mm outside diameter and 76 mm assembled width T (8.661 × 13.386 × 2.992 in) to the ISO 355 boundary plan. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 4FD, which is the maker-neutral cross-reference for the 220×340 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. The printed contact-angle geometry gives the low-section 32000 family tuned for low friction its characteristic load split — at 1180/1690 kN (C/C0) the static rating is about 1.43× C, typical of tapered bearings proportioned for heavy combined duty. The 5.4 kN-per-mm-bore capacity figure for 32044XUUTG summarises the 1180 kN rating over 220 mm bore; use it to sanity-check an interchange candidate before swapping brands. Mount the 220 mm-bore cone on the shaft first (induction heat, max 120 °C), fit the cup square in its housing, then set preload or end play; never drive the cup home through the rollers of 32044XUUTG.
Typical equipment & failure modes
Common applications
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- At 220 mm bore the 32044XUUTG set is adjusted with hydraulic nuts on large mill and wind positions; follow the drive-up angle/end-play procedure, because manual torque methods cannot control preload at the 1180 kN C level.
- The thin 76 mm section of 32044XUUTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 220 mm bore smears the roller ends against the rib.
- ISO 355 makes the 220×340 mm envelope interchangeable but not the ratings: NTN prints 1180/1690 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- Minimum load matters at high speed: an unloaded 32044XUUTG at a large fraction of 960 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- Minimum load matters at high speed: an unloaded 32044XUUTG at a large fraction of 960 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- The 1180/1690 kN ratings and 152 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32044XUUTG (ISO 355 4FD); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 32044XUUTG?
32044XUUTG is a metric 4T tapered roller bearing to ISO 355: 220 mm bore, 340 mm outside diameter and 76 mm assembled width T (8.661 × 13.386 × 2.992 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 1690 kN, Pu 152 kN, grease limiting speed 960 r/min, oil speed 1,400 r/min, mass about 24900 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32044XUUTG?
4T is NTN's tapered roller bearing brand mark, stamped on the cone and cup in the factory. It identifies the NTN 4T programme and is not a dimension, so the catalogue and this page list the bare ISO 355 number (32044XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32044XUUTG designation encode the 220 mm bore and what is 4FD?
last two digits 44 are the ISO bore code, ×5 = 220 mm (codes 00–03 use the 10/12/15/17 exception table). The 340 mm OD and 76 mm assembled T follow the ISO 355 dimension-series plan. 4FD is the maker-neutral ISO 355 abbreviation for this dimension series (the same code other manufacturers print); 4T is NTN's own brand mark.
Why does 32044XUUTG list two speeds, 960 and 1,400 r/min?
The lower figure, 960 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32044XUUTG at 1,400 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32044XUUTG mean?
Suffix reading on 32044XUUTG: the XUUTG suffix marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design for longer life inside the unchanged ISO 355 envelope; XU combines the X ISO boundary section with the U uprated internal design; the suffix is part of the order number and the variants are not interchangeable articles.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.