30219U bearing: complete specifications & equivalents
The 30219U is a ISO 355 radial bearing sized 95 x 170 x 34.5 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 95 mm |
| Outer diameter D | 170 mm |
| Width B | 34.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 250 kN |
| Basic static load rating C0 | 290 kN |
| Fatigue load limit Pu | 32.5 kN |
| Limiting speed (mechanical) | 2100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3120 g |
| Manufacturer designation | NTN 30219U |
| 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 & 30200-series range
| Bore d | 3.74 in |
|---|---|
| Outer diameter D | 6.693 in |
| Width B | 1.358 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 37.5 mm |
| Smallest bore in 30200-series | 15 mm |
| Largest outer diameter in 30200-series | 580 mm |
| Width range across 30200-series | 11.75–104 mm |
| Bore position in 30200-series (smallest first) | 19 of 37 |
| Bore above smallest 30200-series size | 80 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30219U | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 30219U model number is decoded
For a 95 mm shaft with a thrust component, NTN lists 30219U, a metric 4T tapered roller bearing of 250 kN C and 290 kN C0 inside the 170 mm OD, 34.5 mm-wide assembled set. Digit by digit, the bare number identifies the standard-section 30200 family and a bore code resolving to 95 mm; 170 mm OD and 34.5 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. NTN grades 4T metric bearings as open bearings without integral seals; at 95 mm bore the application supplies the seals and the grease fill or oil supply to the 3FB ISO 355 assembly. Catalogue mass of the 30219U set is 3120 g (0.123 lb cone + cup); abutment and shaft shoulder design must carry that mass square to the axis. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 95 mm pair is misadjusted and the 34.5 mm T set will edge-load in service.
Typical equipment & failure modes
Common applications
- heavy industrial gearboxes and crane travel drives
- rolling-mill auxiliary and pinion-stand shafts
- large conveyor and bucket-elevator pulleys
- mineral-processing feeder and crusher auxiliaries
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- water-induced pitting when the open bearing is exposed to washdown without external seals
Selection pitfalls — read before you substitute
- Mount the 95 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 3120 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The standard-section 30200 family at 95 mm bore (170×34.5 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,800 r/min oil ceiling.
- Do not confuse T (34.5 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.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 95 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The 37.5 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 30219U or the ring will bottom out on the radius instead of the shoulder face.
- The 250/290 kN ratings and 32.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 30219U (ISO 355 3FB); 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 30219U?
30219U is a metric 4T tapered roller bearing to ISO 355: 95 mm bore, 170 mm outside diameter and 34.5 mm assembled width T (3.74 × 6.693 × 1.358 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 250 kN, C0 290 kN, Pu 32.5 kN, grease limiting speed 2,100 r/min, oil speed 2,800 r/min, mass about 3120 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 30219U?
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 (30219U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 30219U designation encode the 95 mm bore and what is 3FB?
last two digits 19 are the ISO bore code, ×5 = 95 mm (codes 00–03 use the 10/12/15/17 exception table). The 170 mm OD and 34.5 mm assembled T follow the ISO 355 dimension-series plan. 3FB 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 30219U list two speeds, 2,100 and 2,800 r/min?
The lower figure, 2,100 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 30219U at 2,800 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 30219U mean?
Suffix reading on 30219U: 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.