32920-NTN bearing: complete specifications & equivalents
The 32920-NTN is a ISO 355 radial bearing sized 100 x 140 x 25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 100 mm |
| Outer diameter D | 140 mm |
| Width B | 25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 108 kN |
| Basic static load rating C0 | 162 kN |
| Fatigue load limit Pu | 18.6 kN |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1080 g |
| Manufacturer designation | NTN 32920 |
| 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 | 3.937 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 0.984 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 20 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) | 14 of 37 |
| Bore above smallest 32900-series size | 65 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32920 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 100×140×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 32920-DF | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
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 32920-NTN model number is decoded
32920 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 100×140 mm ISO 355 envelope, with 25 mm overall assembled width T. Digit by digit, the bare number identifies the extra-light thin-section 32900 family and a bore code resolving to 100 mm; 140 mm OD and 25 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. With no letter after the number, 32920 is the basic open 4T execution: steel cage, normal adjustment, no seal or special internal-design suffix in the order code. The two speed columns differ by a factor of .75 (grease/limiting 2,400 vs oil 3,200 r/min); heat generation at the cone rib decides which lubrication a real 32920 arrangement can sustain. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 100 mm pair is misadjusted and the 25 mm T set will edge-load in service.
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 damage from a mounting blow delivered through the roller complement instead of the ring face
- edge loading when shaft deflection exceeds the few arc-minutes of misalignment the adjusted pair allows
Selection pitfalls — read before you substitute
- Mount the 100 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 1080 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The thin 25 mm section of 32920 is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 100 mm bore smears the roller ends against the rib.
- Do not confuse T (25 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 U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32920 by size alone can deliver the wrong contact-angle execution for a pinion position.
- ISO 355 makes the 100×140 mm envelope interchangeable but not the ratings: NTN prints 108/162 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 108/162 kN ratings and 18.6 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32920; 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 32920?
32920 is a metric 4T tapered roller bearing to ISO 355: 100 mm bore, 140 mm outside diameter and 25 mm assembled width T (3.937 × 5.512 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 108 kN, C0 162 kN, Pu 18.6 kN, grease limiting speed 2,400 r/min, oil speed 3,200 r/min, mass about 1080 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32920?
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 (32920); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32920 designation encode the 100 mm bore?
last two digits 20 are the ISO bore code, ×5 = 100 mm (codes 00–03 use the 10/12/15/17 exception table). The 140 mm OD and 25 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32920 list two speeds, 2,400 and 3,200 r/min?
The lower figure, 2,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32920 at 3,200 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32920 mean?
It is the basic open 4T execution — steel cage, adjusted mounting, no seal or feature suffix. NTN uses U for the uprated design, UTG for ULTAGE large-bearing specs, X for the ISO boundary section, and C/CA/D/A for contact-angle or internal-design variants; all are separate order numbers.
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.