32940XUUTG bearing: complete specifications & equivalents
The 32940XUUTG is a ISO 355 radial bearing sized 200 x 280 x 51 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 200 mm |
| Outer diameter D | 280 mm |
| Width B | 51 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 620 kN |
| Basic static load rating C0 | 895 kN |
| Fatigue load limit Pu | 84 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9280 g |
| Manufacturer designation | NTN 32940XUUTG |
| 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 & 32900-series range
| Bore d | 7.874 in |
|---|---|
| Outer diameter D | 11.024 in |
| Width B | 2.008 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 32900-series | 35 mm |
| Largest outer diameter in 32900-series | 600 mm |
| Width range across 32900-series | 14–100 mm |
| Bore position in 32900-series (smallest first) | 25 of 37 |
| Bore above smallest 32900-series size | 165 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32940XUUTG | 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 32940XUUTG model number is decoded
32940XUUTG is a metric single-row tapered roller bearing in the NTN 4T programme: a pressed-steel cage guides profiled rollers between a separable cone and cup on the 200×280 mm ISO 355 envelope, with 51 mm overall assembled width T. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32940XUUTG by the metric ISO 355 number (ISO series abbreviation 3EC): 200 mm bore, 280 mm OD. A tapered roller bearing reacts combined radial and one-direction axial load; NTN mounts 32940XUUTG cone and cup separately and adjusts end play or preload against a second bearing, so the arrangement locates the shaft in both directions. The 40.0 mm section height over the 200 mm bore positions the load centre; axial location of the pair depends on that contact line, so spacer faces must be square within the P0 tolerance of the bearing. When pairing 32940XUUTG with a second tapered bearing, keep the matched arrangement clean: a single stray grit particle between cup and housing changes preload faster than the adjustment range can correct.
Typical equipment & failure modes
Common applications
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
- rolling-mill roll-neck and gearbox positions
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- 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
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- indentation of the raceways by hard particles in unsealed open arrangements
Selection pitfalls — read before you substitute
- At 200 mm bore the 32940XUUTG 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 620 kN C level.
- The thin 51 mm section of 32940XUUTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 200 mm bore smears the roller ends against the rib.
- Replacing one half of an adjusted pair without resetting end play negates the 51 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Minimum load matters at high speed: an unloaded 32940XUUTG at a large fraction of 1,100 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- Do not confuse T (51 mm assembled width of cone + cup) with the cone width when drawing spacers; an abutment sized to T instead of the ring width leaves the cup unseated.
- The 620/895 kN ratings and 84 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32940XUUTG (ISO 355 3EC); 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 32940XUUTG?
32940XUUTG is a metric 4T tapered roller bearing to ISO 355: 200 mm bore, 280 mm outside diameter and 51 mm assembled width T (7.874 × 11.024 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 895 kN, Pu 84 kN, grease limiting speed 1,100 r/min, oil speed 1,600 r/min, mass about 9280 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32940XUUTG?
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 (32940XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32940XUUTG designation encode the 200 mm bore and what is 3EC?
last two digits 40 are the ISO bore code, ×5 = 200 mm (codes 00–03 use the 10/12/15/17 exception table). The 280 mm OD and 51 mm assembled T follow the ISO 355 dimension-series plan. 3EC 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 32940XUUTG list two speeds, 1,100 and 1,600 r/min?
The lower figure, 1,100 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32940XUUTG at 1,600 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32940XUUTG mean?
Suffix reading on 32940XUUTG: 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.