HH228349-HH228310 bearing: complete specifications & equivalents
The HH228349-HH228310 is a ANSI ABMA 19.2 radial bearing sized 127 x 254 x 77.788 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 127 mm |
| Outer diameter D | 254 mm |
| Width B | 77.788 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 8201 kN |
| Basic static load rating C0 | 70 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 18000 g |
| Manufacturer designation | NTN 4T-HH228349/HH228310 |
| 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 | 5 in |
|---|---|
| Outer diameter D | 10 in |
| Width B | 3.063 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 63.5 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) | 133 of 148 |
| Bore above smallest 4t-inch-series size | 114.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HH228349 | 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 HH228349-HH228310 model number is decoded
4T-HH228349/HH228310 is the NTN 4T catalogue entry for a 127×254×77.788 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: HH228349 identifies the cone of 127 mm (5 in) bore by catalogue lookup, and HH228310 fixes the 254 mm OD. The 63.5 mm radial section over the 127 mm bore positions the contact line of the pair; abutment shoulders and spacers are dimensioned from that geometry, not from the bore alone. Cup-side note for HH228310: within the extra-heavy HH family tables the HH228349 cone is listed against several cup options, and it is the cup that fixes the 254 mm OD and the 77.788 mm assembled width — quote the full HH228349/HH228310 pair, never the cone alone. The rollers run with their large ends against the cone's guide rib; lubricant must reach that rib face of 4T-HH228349/HH228310, not only the raceway, or the pair smears on the first overloaded start.
Typical equipment & failure modes
Common applications
- rolling-mill pinion stands and roll-neck auxiliaries
- mine hoist and dragline drum shafts
- heavy press and forging-machine drive shafts
- port-crane travel and hoist gearboxes
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- false brinelling on a stationary pair exposed to vibration during transport or standby
- cage fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- At 127 mm bore the 4T-HH228349/HH228310 set is adjusted with hydraulic nuts or measured shims on mill and crane positions; manual torque methods cannot control preload at the 8201 kN C level.
- The extra-heavy HH family is proportioned for a high thrust share; swapping to a lighter LM or pure-numeric series at the same 127 mm bore cuts axial capacity even when the envelope fits — re-verify the load split before downgrading.
- Fit selection follows the rotating ring: a rotating cone on a 127 mm shaft takes a m6/n6 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- Shaft and housing fillets must clear the ring chamfers of HH228349 and HH228310; use undercut shoulders so the rings seat on the face, not on a radius.
- Quote the full HH228349/HH228310 pair at ordering: the HH228349 cone also ships against sibling cups, and a cup from another reference changes the 77.788 mm assembled width and the rating.
- The 8201/70 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-HH228349/HH228310; 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-HH228349/HH228310?
4T-HH228349/HH228310 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 127 mm bore (5 in), 254 mm outside diameter and 77.788 mm assembled width T (10 × 3.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8201 kN, C0 70 kN, grease limiting speed 1,400 r/min, oil speed 1,900 r/min, mass about 18000 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-HH228349/HH228310 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the HH228349 cone or the HH228310 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 8201/70 kN ratings change with the cup.
What is the difference between 4T-HH228349/HH228310 and a metric ISO 355 tapered bearing?
4T-HH228349/HH228310 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 127×254×77.788 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-HH228349/HH228310 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 HH228349/HH228310 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-HH228349/HH228310 list two speeds, 1,400 and 1,900 r/min?
The lower figure, 1,400 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-HH228349/HH228310 at 1,900 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.