33019U bearing: complete specifications & equivalents
The 33019U is a ISO 355 radial bearing sized 95 x 145 x 39 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 | 145 mm |
| Width B | 39 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 243 kN |
| Basic static load rating C0 | 375 kN |
| Fatigue load limit Pu | 43 kN |
| Limiting speed (mechanical) | 2300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2300 g |
| Manufacturer designation | NTN 33019U |
| 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 & 33000-series range
| Bore d | 3.74 in |
|---|---|
| Outer diameter D | 5.709 in |
| Width B | 1.535 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25 mm |
| Smallest bore in 33000-series | 25 mm |
| Largest outer diameter in 33000-series | 225 mm |
| Width range across 33000-series | 17–59 mm |
| Bore position in 33000-series (smallest first) | 17 of 24 |
| Bore above smallest 33000-series size | 70 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33019U | 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 33019U model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 33019U denotes the slim 33000 family of metric tapered roller bearings, 95 mm bore, 145 mm outside diameter and 39 mm assembled width T (3.74 × 5.709 × 1.535 in) to the ISO 355 boundary plan. Digit by digit, the bare number identifies the slim 33000 family and a bore code resolving to 95 mm; 145 mm OD and 39 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. 2203E lists two speed ceilings for 33019U: 2,300 r/min with grease lubrication (the limiting speed) and 3,100 r/min with oil, the higher oil value reflecting better heat removal from the cone rib. The 25.0 mm section height over the 95 mm bore positions the load centre; axial location of the pair depends on that contact line, so spacer faces must be square within the P0 tolerance of the bearing. 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 39 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
- 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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- indentation of the raceways by hard particles in unsealed open arrangements
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 2300 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The thin 39 mm section of 33019U is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 95 mm bore smears the roller ends against the rib.
- The 25.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 33019U or the ring will bottom out on the radius instead of the shoulder face.
- The 25.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 33019U or the ring will bottom out on the radius instead of the shoulder face.
- Grease packs must leave free volume in the 39 mm-wide set; over-greasing a paired bearing churning at the 3,100 r/min oil-band speed raises temperature and destroys the preload setting.
- The 243/375 kN ratings and 43 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33019U (ISO 355 2CE); 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 33019U?
33019U is a metric 4T tapered roller bearing to ISO 355: 95 mm bore, 145 mm outside diameter and 39 mm assembled width T (3.74 × 5.709 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 243 kN, C0 375 kN, Pu 43 kN, grease limiting speed 2,300 r/min, oil speed 3,100 r/min, mass about 2300 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33019U?
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 (33019U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33019U designation encode the 95 mm bore and what is 2CE?
last two digits 19 are the ISO bore code, ×5 = 95 mm (codes 00–03 use the 10/12/15/17 exception table). The 145 mm OD and 39 mm assembled T follow the ISO 355 dimension-series plan. 2CE 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 33019U list two speeds, 2,300 and 3,100 r/min?
The lower figure, 2,300 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33019U at 3,100 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33019U mean?
Suffix reading on 33019U: 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.