32914XU bearing: complete specifications & equivalents
The 32914XU is a ISO 355 radial bearing sized 70 x 100 x 20 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 70 mm |
| Outer diameter D | 100 mm |
| Width B | 20 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 76 kN |
| Basic static load rating C0 | 110 kN |
| Fatigue load limit Pu | 13.4 kN |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 475 g |
| Manufacturer designation | NTN 32914XU |
| 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 | 2.756 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 0.787 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 15 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) | 8 of 37 |
| Bore above smallest 32900-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32914XU | 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 32914XU model number is decoded
NTN supplies this 70 mm bore tapered roller position as 32914XU: one cone assembly, one cup, line-contact rollers and a steel cage, rated 76 kN basic dynamic and 110 kN static on the extra-light thin-section 32900 family. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 2BC, which is the maker-neutral cross-reference for the 70×100 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. NTN adjusts these bearings by cup or cone position rather than shipping a preloaded set; the mounting drawing must state end play or preload for 32914XU, since running clearance is set during assembly. The two speed columns differ by a factor of .74 (grease/limiting 3,400 vs oil 4,600 r/min); heat generation at the cone rib decides which lubrication a real 32914XU arrangement can sustain. Open 4T bearings need application seals; without them the grease at the cone rib of 32914XU washes out and the rib/roller-end contact smears on the first wet or dusty shift.
Typical equipment & failure modes
Common applications
- large conveyor and bucket-elevator pulleys
- mineral-processing feeder and crusher auxiliaries
- marine winch and deck-machinery shafts
- paper-machine press-section rolls
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- edge loading when shaft deflection exceeds the few arc-minutes of misalignment the adjusted pair allows
Selection pitfalls — read before you substitute
- Mount the 70 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 475 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The thin 20 mm section of 32914XU is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 70 mm bore smears the roller ends against the rib.
- Open 32914XU units have no seals: a wheel-hub or gearbox application needs external sealing or the 3,400 r/min grease figure is meaningless once water reaches the cone rib.
- Replacing one half of an adjusted pair without resetting end play negates the 20 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 70 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The 76/110 kN ratings and 13.4 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32914XU (ISO 355 2BC); 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 32914XU?
32914XU is a metric 4T tapered roller bearing to ISO 355: 70 mm bore, 100 mm outside diameter and 20 mm assembled width T (2.756 × 3.937 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 76 kN, C0 110 kN, Pu 13.4 kN, grease limiting speed 3,400 r/min, oil speed 4,600 r/min, mass about 475 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32914XU?
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 (32914XU); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32914XU designation encode the 70 mm bore and what is 2BC?
last two digits 14 are the ISO bore code, ×5 = 70 mm (codes 00–03 use the 10/12/15/17 exception table). The 100 mm OD and 20 mm assembled T follow the ISO 355 dimension-series plan. 2BC 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 32914XU list two speeds, 3,400 and 4,600 r/min?
The lower figure, 3,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32914XU at 4,600 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32914XU mean?
Suffix reading on 32914XU: XU combines the X ISO boundary section with the U uprated internal design; U marks the reinforced/uprated internal design of the bare number, a separate order number with higher load capacity than the basic execution; 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.