H715348-H715311 bearing: complete specifications & equivalents
The H715348-H715311 is a ANSI ABMA 19.2 radial bearing sized 77.788 x 136.525 x 46.038 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 77.788 mm |
| Outer diameter D | 136.525 mm |
| Width B | 46.038 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 248 kN |
| Basic static load rating C0 | 355 kN |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2840 g |
| Manufacturer designation | NTN 4T-H715348/H715311 |
| 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 | 3.063 in |
|---|---|
| Outer diameter D | 5.375 in |
| Width B | 1.813 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 29.4 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) | 95 of 148 |
| Bore above smallest 4t-inch-series size | 65.088 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| H715348 | 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 H715348-H715311 model number is decoded
4T-H715348/H715311 is the NTN 4T catalogue entry for a 77.788×136.525×46.038 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Cone and cup of 4T-H715348/H715311 are separately stocked parts: a worn H715311 cup can be replaced against the existing H715348 cone, provided the new cup carries the identical reference — pairing across references changes the 46.038 mm assembled width and the rating. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 46.038 mm T of each 4T-H715348/H715311 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. Cup-side note for H715311: within the heavy H family tables the H715348 cone is listed against several cup options, and it is the cup that fixes the 136.525 mm OD and the 46.038 mm assembled width — quote the full H715348/H715311 pair, never the cone alone. Running clearance of 4T-H715348/H715311 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
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
- crusher and screening-plant eccentric shafts
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cage damage from a mounting blow transmitted through the roller complement
- brinell marks on cone and cup raceways from impact during handling or hammer fitting
Selection pitfalls — read before you substitute
- Mount the 77.788 mm cone by induction heating (max 120 °C) and the 136.525 mm cup with a press sleeve; at 2840 g a cocked ring brinells the raceway directly.
- The heavy H family at 77.788 mm bore (136.525×46.038 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full H715348/H715311 reference at purchase.
- Do not confuse T (46.038 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Open 4T-H715348/H715311 sets have no seals: a hub or gearbox needs external sealing or the 2,600 r/min grease figure is meaningless once water reaches the cone rib.
- ABMA makes the 77.788×136.525 mm envelope interchangeable, not the ratings: NTN prints 248/355 kN for this execution and another make of the same number can differ in roller complement.
- The 248/355 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-H715348/H715311; 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-H715348/H715311?
4T-H715348/H715311 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 77.788 mm bore (3.063 in), 136.525 mm outside diameter and 46.038 mm assembled width T (5.375 × 1.813 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 248 kN, C0 355 kN, grease limiting speed 2,600 r/min, oil speed 3,500 r/min, mass about 2840 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-H715348/H715311 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the H715348 cone or the H715311 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 248/355 kN ratings change with the cup.
What is the difference between 4T-H715348/H715311 and a metric ISO 355 tapered bearing?
4T-H715348/H715311 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 77.788×136.525×46.038 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-H715348/H715311 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 H715348/H715311 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-H715348/H715311 list two speeds, 2,600 and 3,500 r/min?
The lower figure, 2,600 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-H715348/H715311 at 3,500 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.