HM89249-HM89210 bearing: complete specifications & equivalents
The HM89249-HM89210 is a ANSI ABMA 19.2 radial bearing sized 36.512 x 79.375 x 29.37 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 36.512 mm |
| Outer diameter D | 79.375 mm |
| Width B | 29.37 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 95.5 kN |
| Basic static load rating C0 | 104 kN |
| Limiting speed (mechanical) | 5000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 689 g |
| Manufacturer designation | NTN 4T-HM89249/HM89210 |
| 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 | 1.437 in |
|---|---|
| Outer diameter D | 3.125 in |
| Width B | 1.156 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 21.4 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) | 40 of 148 |
| Bore above smallest 4t-inch-series size | 23.812 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM89249 | 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 HM89249-HM89210 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-HM89249/HM89210 denotes the heavy-medium HM family of NTN inch tapered roller bearings — cone HM89249 and cup HM89210 delivered as a matched, separable pair of 36.512 mm bore and 79.375 mm outside diameter. Cone and cup of 4T-HM89249/HM89210 are separately stocked parts: a worn HM89210 cup can be replaced against the existing HM89249 cone, provided the new cup carries the identical reference — pairing across references changes the 29.37 mm assembled width and the rating. Selection: C 95.5 kN against C0 104 kN gives a C0/C ratio of 1.09 for the 36.512 mm bore; the pair is counted as one adjusted unit when checking L10 at the equivalent combined load. Cup-side note for HM89210: within the heavy-medium HM family tables the HM89249 cone is listed against several cup options, and it is the cup that fixes the 79.375 mm OD and the 29.37 mm assembled width — quote the full HM89249/HM89210 pair, never the cone alone. Fillet radii must clear the chamfers of the HM89249 cone and HM89210 cup; undercut shoulders seat the rings fully instead of bridging on a radius.
Typical equipment & failure modes
Common applications
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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 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
- Hub and pinion positions of this 36.512 mm class are adjusted in pairs; verify end play against the axle or gearbox drawing and re-torque after bedding-in instead of trusting the first setting on 4T-HM89249/HM89210.
- The heavy-medium HM family is proportioned for a high thrust share; swapping to a lighter LM or pure-numeric series at the same 36.512 mm bore cuts axial capacity even when the envelope fits — re-verify the load split before downgrading.
- Quote the full HM89249/HM89210 pair at ordering: the HM89249 cone also ships against sibling cups, and a cup from another reference changes the 29.37 mm assembled width and the rating.
- Replacing one half of an adjusted pair without resetting end play negates the 29.37 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- ABMA makes the 36.512×79.375 mm envelope interchangeable, not the ratings: NTN prints 95.5/104 kN for this execution and another make of the same number can differ in roller complement.
- The 95.5/104 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-HM89249/HM89210; 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-HM89249/HM89210?
4T-HM89249/HM89210 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 36.512 mm bore (1.437 in), 79.375 mm outside diameter and 29.37 mm assembled width T (3.125 × 1.156 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 95.5 kN, C0 104 kN, grease limiting speed 5,000 r/min, oil speed 6,600 r/min, mass about 689 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-HM89249/HM89210 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the HM89249 cone or the HM89210 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 95.5/104 kN ratings change with the cup.
What is the difference between 4T-HM89249/HM89210 and a metric ISO 355 tapered bearing?
4T-HM89249/HM89210 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 36.512×79.375×29.37 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-HM89249/HM89210 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 HM89249/HM89210 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-HM89249/HM89210 list two speeds, 5,000 and 6,600 r/min?
The lower figure, 5,000 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-HM89249/HM89210 at 6,600 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.