320-22X bearing: complete specifications & equivalents
The 320-22X is a ISO 355 radial bearing sized 22 x 44 x 15 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 22 mm |
| Outer diameter D | 44 mm |
| Width B | 15 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 30 kN |
| Basic static load rating C0 | 31.5 kN |
| Limiting speed (mechanical) | 8900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 105 g |
| Manufacturer designation | NTN 320/22X |
| 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 | 0.866 in |
|---|---|
| Outer diameter D | 1.732 in |
| Width B | 0.591 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 11 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) | 2 of 43 |
| Bore above smallest 32000-series size | 2 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 320-22 | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 320-28 | 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. |
| 320-32 | 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 320-22X model number is decoded
320/22X belongs to the NTN metric 4T tapered roller range (low-section 32000 family tuned for low friction); the open bearing leaves sealing to the application and is normally ordered and mounted as an adjustable matched pair. The 22 mm bore is printed directly after the slash in the slash-size convention under the ISO 355 numbering; the 15 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. Suffix reading on 320/22X: X marks the execution built to the ISO boundary-dimension section (interchangeable envelope, NTN internal geometry); the suffix is part of the order number and the variants are not interchangeable articles. 2203E does not print a Pu fatigue load limit for 320/22X; life work for this size uses the 30/31.5 kN C/C0 pair directly. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 320/22X arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- small automotive wheel hubs and trailer axles
- light-vehicle differential and pinion shafts
- agricultural implement hubs and ground-tool drives
- small gearbox input shafts with combined load
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- 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
- At 22 mm bore the thin section and small rollers are adjustment-sensitive: a quarter-turn of the locknut moves end play by more than on large bearings, so set the 320/22X pair with a dial indicator rather than by feel.
- The thin 15 mm section of 320/22X is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 22 mm bore smears the roller ends against the rib.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 320/22X by size alone can deliver the wrong contact-angle execution for a pinion position.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 320/22X by size alone can deliver the wrong contact-angle execution for a pinion position.
- ISO 355 makes the 22×44 mm envelope interchangeable but not the ratings: NTN prints 30/31.5 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 30/31.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 320/22X (ISO 355 3CC); 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 320/22X?
320/22X is a metric 4T tapered roller bearing to ISO 355: 22 mm bore, 44 mm outside diameter and 15 mm assembled width T (0.866 × 1.732 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 30 kN, C0 31.5 kN (2203E prints no Pu for this size), grease limiting speed 8,900 r/min, oil speed 12,000 r/min, mass about 105 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 320/22X?
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 (320/22X); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 320/22X designation encode the 22 mm bore and what is 3CC?
22 mm bore is printed directly after the slash in the slash-size convention. The 44 mm OD and 15 mm assembled T follow the ISO 355 dimension-series plan. 3CC 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 320/22X list two speeds, 8,900 and 12,000 r/min?
The lower figure, 8,900 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 320/22X at 12,000 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 320/22X mean?
Suffix reading on 320/22X: X marks the execution built to the ISO boundary-dimension section (interchangeable envelope, NTN internal geometry); 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.