HM803149-HM803110 bearing: complete specifications & equivalents
The HM803149-HM803110 is a ANSI ABMA 19.2 radial bearing sized 44.45 x 88.9 x 30.162 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 44.45 mm |
| Outer diameter D | 88.9 mm |
| Width B | 30.162 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 104 kN |
| Basic static load rating C0 | 125 kN |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 850 g |
| Manufacturer designation | NTN 4T-HM803149/HM803110 |
| 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 | 1.75 in |
|---|---|
| Outer diameter D | 3.5 in |
| Width B | 1.187 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 22.2 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) | 51 of 148 |
| Bore above smallest 4t-inch-series size | 31.750000000000004 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM803149-110 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 44.45×88.9×30.162 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
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 HM803149-HM803110 model number is decoded
The NTN 2203E inch table prints 4T-HM803149/HM803110 at 44.45 mm bore (1.75 in), 88.9 mm cup OD and 30.162 mm assembled T, with a grease limiting speed of 4,300 r/min and an oil ceiling of 5,800 r/min. Cone and cup of 4T-HM803149/HM803110 are separately stocked parts: a worn HM803110 cup can be replaced against the existing HM803149 cone, provided the new cup carries the identical reference — pairing across references changes the 30.162 mm assembled width and the rating. Catalogue mass of the 4T-HM803149/HM803110 cone-plus-cup set is 850 g; shaft and housing shoulders must carry that mass square to the axis during fitting. Housing fitment sequence for 4T-HM803149/HM803110: press the HM803110 cup square into the 88.9 mm seat first, then bring the HM803149 cone (on its 44.45 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Mount the 44.45 mm cone with an induction heater (max 120 °C) and press the 88.9 mm cup with a sleeve; driving either ring through the rollers brinells the raceways.
Typical equipment & failure modes
Common applications
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel 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
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 44.45 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-HM803149/HM803110.
- The heavy-medium HM family is proportioned for a high thrust share; swapping to a lighter LM or pure-numeric series at the same 44.45 mm bore cuts axial capacity even when the envelope fits — re-verify the load split before downgrading.
- Grease packs must leave free volume inside the 30.162 mm-wide set; over-greasing a pair churning near the oil-band speed of 5,800 r/min raises temperature and destroys the setting.
- Open 4T-HM803149/HM803110 sets have no seals: a hub or gearbox needs external sealing or the 4,300 r/min grease figure is meaningless once water reaches the cone rib.
- Replacing one half of an adjusted pair without resetting end play negates the 30.162 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 104/125 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-HM803149/HM803110; 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-HM803149/HM803110?
4T-HM803149/HM803110 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 44.45 mm bore (1.75 in), 88.9 mm outside diameter and 30.162 mm assembled width T (3.5 × 1.187 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 104 kN, C0 125 kN, grease limiting speed 4,300 r/min, oil speed 5,800 r/min, mass about 850 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-HM803149/HM803110 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the HM803149 cone or the HM803110 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 104/125 kN ratings change with the cup.
What is the difference between 4T-HM803149/HM803110 and a metric ISO 355 tapered bearing?
4T-HM803149/HM803110 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 44.45×88.9×30.162 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-HM803149/HM803110 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 HM803149/HM803110 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-HM803149/HM803110 list two speeds, 4,300 and 5,800 r/min?
The lower figure, 4,300 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 4T-HM803149/HM803110 at 5,800 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.