09078-09195 bearing: complete specifications & equivalents
The 09078-09195 is a ANSI ABMA 19.2 radial bearing sized 19.05 x 49.225 x 19.845 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 19.05 mm |
| Outer diameter D | 49.225 mm |
| Width B | 19.845 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 42.5 kN |
| Basic static load rating C0 | 39 kN |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 190 g |
| Manufacturer designation | NTN 4T-09078/09195 |
| Standard | ANSI ABMA 19.2 |
| Catalog version | NTN 2203E 2026-09-25 |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN 2203E 2026-09-25) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN 2203E 2026-09-25); 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 & 4t-inch-series range
| Bore d | 0.75 in |
|---|---|
| Outer diameter D | 1.938 in |
| Width B | 0.781 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 15.1 mm |
| Smallest bore in 4t-inch-series | 12.7 mm |
| Largest outer diameter in 4t-inch-series | 260 mm |
| Width range across 4t-inch-series | 10.998–77.788 mm |
| Bore position in 4t-inch-series (smallest first) | 6 of 148 |
| Bore above smallest 4t-inch-series size | 6.350000000000001 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 09078 | 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 09078-09195 model number is decoded
4T-09078/09195 belongs to the NTN inch 4T tapered roller range (pure-numeric inch family); cone and cup are ordered by their own references and are individually interchangeable with like-numbered parts. Cone and cup of 4T-09078/09195 are separately stocked parts: a worn 09195 cup can be replaced against the existing 09078 cone, provided the new cup carries the identical reference — pairing across references changes the 19.845 mm assembled width and the rating. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 19.845 mm T of each 4T-09078/09195 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. The printed 42.5/39 kN ratings belong to the assembled 09078+09195 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. Running clearance of 4T-09078/09195 is set at mounting by axial displacement of cone or cup — the catalogue does not ship a preloaded set, so the drawing must state end play or preload.
Typical equipment & failure modes
Common applications
- small machine-tool feed and spindle counter-supports
- light trailer and boat-trailer wheel hubs
- small agricultural implement wheels and auger drives
- lawn, garden and powersport axle positions
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- false brinelling on a stationary pair exposed to vibration during transport or standby
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- cage damage from a mounting blow transmitted through the roller complement
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- At 19.05 mm (0.75 in) bore the thin cone and cup distort under an over-tight shaft nut; set the 4T-09078/09195 pair with a dial indicator on end play rather than by locknut feel.
- The pure-numeric inch family at 19.05 mm bore (49.225×19.845 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 09078/09195 reference at purchase.
- Grease packs must leave free volume inside the 19.845 mm-wide set; over-greasing a pair churning near the oil-band speed of 11,000 r/min raises temperature and destroys the setting.
- ABMA makes the 19.05×49.225 mm envelope interchangeable, not the ratings: NTN prints 42.5/39 kN for this execution and another make of the same number can differ in roller complement.
- Quote the full 09078/09195 pair at ordering: the 09078 cone also ships against sibling cups, and a cup from another reference changes the 19.845 mm assembled width and the rating.
- The 42.5/39 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-09078/09195; internal geometry legitimately differs between inch-series makers, so re-verify ratings, adjustment and the exact cone/cup references before substituting another brand on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 4T-09078/09195?
4T-09078/09195 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 19.05 mm bore (0.75 in), 49.225 mm outside diameter and 19.845 mm assembled width T (1.938 × 0.781 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 42.5 kN, C0 39 kN, grease limiting speed 8,500 r/min, oil speed 11,000 r/min, mass about 190 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-09078/09195 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 09078 cone or the 09195 cup can be replaced by an identical reference from NTN or another ABMA-dimensioned maker. Pairing the cone with a different cup reference is a different catalogue row: OD, assembled T and the 42.5/39 kN ratings change with the cup.
What is the difference between 4T-09078/09195 and a metric ISO 355 tapered bearing?
4T-09078/09195 follows the ABMA inch boundary plan with cone/cup references; ISO 355 bearings use metric dimension-series numbers (302, 322, …). Even where a metric size looks close to 19.05×49.225×19.845 mm, the envelopes and contact angles differ — the two systems are not drop-in interchangeable; check every boundary value before substituting.
What does the 4T prefix on 4T-09078/09195 mean?
4T is NTN's tapered roller bearing quality mark, stamped on cone and cup in the factory. It identifies NTN's 4T programme and is not a dimension or variant code, so interchange lists quote the bare 09078/09195 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-09078/09195 list two speeds, 8,500 and 11,000 r/min?
The lower figure, 8,500 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 4T-09078/09195 at 11,000 r/min because oil removes rib-contact heat better. Real limits still depend on pair adjustment, oil flow and cooling.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN 2203E 2026-09-25 on 2026-10-01. Read our editorial & correction policy.