HM617049-HM617010 bearing: complete specifications & equivalents
The HM617049-HM617010 is a ANSI ABMA 19.2 radial bearing sized 85.725 x 142.138 x 42.862 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 85.725 mm |
| Outer diameter D | 142.138 mm |
| Width B | 42.862 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 240 kN |
| Basic static load rating C0 | 350 kN |
| Limiting speed (mechanical) | 2500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2710 g |
| Manufacturer designation | NTN 4T-HM617049/HM617010 |
| 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 | 3.375 in |
|---|---|
| Outer diameter D | 5.596 in |
| Width B | 1.687 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 28.2 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) | 104 of 148 |
| Bore above smallest 4t-inch-series size | 73.02499999999999 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM617049 | 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 HM617049-HM617010 model number is decoded
For an inch shaft of 85.725 mm carrying combined radial and thrust load, NTN lists 4T-HM617049/HM617010, a single-row 4T tapered roller set of 240 kN C and 350 kN C0 inside the 142.138 mm OD cup. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: HM617049 identifies the cone of 85.725 mm (3.375 in) bore by catalogue lookup, and HM617010 fixes the 142.138 mm OD. Catalogue mass of the 4T-HM617049/HM617010 cone-plus-cup set is 2710 g; shaft and housing shoulders must carry that mass square to the axis during fitting. Housing fitment sequence for 4T-HM617049/HM617010: press the HM617010 cup square into the 142.138 mm seat first, then bring the HM617049 cone (on its 85.725 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Running clearance of 4T-HM617049/HM617010 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
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
- crusher and screening-plant eccentric shafts
- heavy truck and bus drive-axle differentials
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- cage fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Mount the 85.725 mm cone by induction heating (max 120 °C) and the 142.138 mm cup with a press sleeve; at 2710 g a cocked ring brinells the raceway directly.
- The heavy-medium HM family is proportioned for a high thrust share; swapping to a lighter LM or pure-numeric series at the same 85.725 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 85.725 mm shaft takes a k5/m5 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 HM617049 and HM617010; use undercut shoulders so the rings seat on the face, not on a radius.
- Inch and metric bores collide on paper — 85.725 mm is 3.375 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- The 240/350 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-HM617049/HM617010; 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-HM617049/HM617010?
4T-HM617049/HM617010 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 85.725 mm bore (3.375 in), 142.138 mm outside diameter and 42.862 mm assembled width T (5.596 × 1.687 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 240 kN, C0 350 kN, grease limiting speed 2,500 r/min, oil speed 3,300 r/min, mass about 2710 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-HM617049/HM617010 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the HM617049 cone or the HM617010 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 240/350 kN ratings change with the cup.
What is the difference between 4T-HM617049/HM617010 and a metric ISO 355 tapered bearing?
4T-HM617049/HM617010 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 85.725×142.138×42.862 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-HM617049/HM617010 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 HM617049/HM617010 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-HM617049/HM617010 list two speeds, 2,500 and 3,300 r/min?
The lower figure, 2,500 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-HM617049/HM617010 at 3,300 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.