332-32 bearing: complete specifications & equivalents
The 332-32 is a ISO 355 radial bearing sized 32 x 65 x 26 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 32 mm |
| Outer diameter D | 65 mm |
| Width B | 26 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 78.5 kN |
| Basic static load rating C0 | 85 kN |
| Limiting speed (mechanical) | 6000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 394 g |
| Manufacturer designation | NTN 332/32 |
| 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 & 33200-series range
| Bore d | 1.26 in |
|---|---|
| Outer diameter D | 2.559 in |
| Width B | 1.024 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 16.5 mm |
| Smallest bore in 33200-series | 25 mm |
| Largest outer diameter in 33200-series | 180 mm |
| Width range across 33200-series | 22–63 mm |
| Bore position in 33200-series (smallest first) | 4 of 18 |
| Bore above smallest 33200-series size | 7 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 332 | 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 332-32 model number is decoded
332/32 belongs to the NTN metric 4T tapered roller range (medium-wide 33200 family); the open bearing leaves sealing to the application and is normally ordered and mounted as an adjustable matched pair. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 332/32 by the metric ISO 355 number (ISO series abbreviation 2DE): 32 mm bore, 65 mm OD. The pressed-steel cage and surface-finished roller ends are standard 4T execution; ULTAGE-marked variants use upgraded material and internal geometry aimed at longer rating life with the same ISO 355 envelope. Selection: C 78.5 kN against C0 85 kN gives a C0/C ratio of 1.08 for the 32 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 332/32 arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- industrial gearbox and speed-reducer shafts
- bevel and helical pinion drives with high thrust component
- pump and compressor drive shafts carrying combined load
- machine-tool gearbox and headstock shafts
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
Selection pitfalls — read before you substitute
- Hub and pinion bearings of this 32 mm bore class are commonly adjusted in pairs; verify end play against the axle drawing and re-torque after bedding-in rather than trusting the initial preload on 332/32.
- The medium-wide 33200 family at 32 mm bore (65×26 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 8,000 r/min oil ceiling.
- ISO 355 makes the 32×65 mm envelope interchangeable but not the ratings: NTN prints 78.5/85 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 32 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- Replacing one half of an adjusted pair without resetting end play negates the 26 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 78.5/85 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 332/32 (ISO 355 2DE); 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 332/32?
332/32 is a metric 4T tapered roller bearing to ISO 355: 32 mm bore, 65 mm outside diameter and 26 mm assembled width T (1.26 × 2.559 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 78.5 kN, C0 85 kN (2203E prints no Pu for this size), grease limiting speed 6,000 r/min, oil speed 8,000 r/min, mass about 394 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 332/32?
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 (332/32); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 332/32 designation encode the 32 mm bore and what is 2DE?
32 mm bore is printed directly after the slash in the slash-size convention. The 65 mm OD and 26 mm assembled T follow the ISO 355 dimension-series plan. 2DE 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 332/32 list two speeds, 6,000 and 8,000 r/min?
The lower figure, 6,000 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 332/32 at 8,000 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 332/32 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.