32220U bearing: complete specifications & equivalents
The 32220U is a ISO 355 radial bearing sized 100 x 180 x 49 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 | 180 mm |
| Width B | 49 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 365 kN |
| Basic static load rating C0 | 465 kN |
| Fatigue load limit Pu | 51 kN |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5110 g |
| Manufacturer designation | NTN 32220U |
| 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 & 32200-series range
| Bore d | 3.937 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 1.929 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 32200-series | 17 mm |
| Largest outer diameter in 32200-series | 580 mm |
| Width range across 32200-series | 17.25–159 mm |
| Bore position in 32200-series (smallest first) | 19 of 36 |
| Bore above smallest 32200-series size | 83 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32220U | 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 32220U model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 32220U denotes the heavy-section 32200 family of metric tapered roller bearings, 100 mm bore, 180 mm outside diameter and 49 mm assembled width T (3.937 × 7.087 × 1.929 in) to the ISO 355 boundary plan. Digit by digit, the bare number identifies the heavy-section 32200 family and a bore code resolving to 100 mm; 180 mm OD and 49 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. 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 32220U, since running clearance is set during assembly. Grease relubrication at 2,000 r/min limiting speed targets the rib contact; if the drive needs 2,700 r/min it must be arranged for oil lubrication with a defined flow to the large roller ends. When pairing 32220U 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
- rolling-mill auxiliary and pinion-stand shafts
- large conveyor and bucket-elevator pulleys
- mineral-processing feeder and crusher auxiliaries
- marine winch and deck-machinery shafts
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- false brinelling on a stationary paired set exposed to external vibration
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 5110 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The heavy-section 32200 family at 100 mm bore (180×49 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,700 r/min oil ceiling.
- Minimum load matters at high speed: an unloaded 32220U at a large fraction of 2,000 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- ISO 355 makes the 100×180 mm envelope interchangeable but not the ratings: NTN prints 365/465 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 100 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The 365/465 kN ratings and 51 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32220U (ISO 355 3FC); 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 32220U?
32220U is a metric 4T tapered roller bearing to ISO 355: 100 mm bore, 180 mm outside diameter and 49 mm assembled width T (3.937 × 7.087 × 1.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 365 kN, C0 465 kN, Pu 51 kN, grease limiting speed 2,000 r/min, oil speed 2,700 r/min, mass about 5110 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32220U?
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 (32220U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32220U designation encode the 100 mm bore and what is 3FC?
last two digits 20 are the ISO bore code, ×5 = 100 mm (codes 00–03 use the 10/12/15/17 exception table). The 180 mm OD and 49 mm assembled T follow the ISO 355 dimension-series plan. 3FC 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 32220U list two speeds, 2,000 and 2,700 r/min?
The lower figure, 2,000 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32220U at 2,700 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32220U mean?
Suffix reading on 32220U: 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.