HM926747-HM926710 bearing: complete specifications & equivalents
The HM926747-HM926710 is a ANSI ABMA 19.2 radial bearing sized 127 x 228.6 x 53.975 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 | 228.6 mm |
| Width B | 53.975 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 475 kN |
| Basic static load rating C0 | 620 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 8830 g |
| Manufacturer designation | NTN 4T-HM926747/HM926710 |
| 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 | 9 in |
| Width B | 2.125 in |
| ISO bore code | 47 |
| Radial section height (D−d)/2 | 50.8 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 |
|---|---|---|---|
| HM926747 | 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 HM926747-HM926710 model number is decoded
4T-HM926747/HM926710 belongs to the NTN inch 4T tapered roller range (heavy-medium HM family); cone and cup are ordered by their own references and are individually interchangeable with like-numbered parts. Letter prefixes inherited from the inch convention mark the load family: LM reads as light-medium, HM as heavy-medium, LL as extra-light, J-prefixed codes as metric-envelope families — HM926747 sits in the heavy-medium HM family. Catalogue mass of the 4T-HM926747/HM926710 cone-plus-cup set is 8830 g; shaft and housing shoulders must carry that mass square to the axis during fitting. The printed 475/620 kN ratings belong to the assembled HM926747+HM926710 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. With a rotating shaft a m6/n6 cone seat and an easy-push cup seat are typical practice for 4T-HM926747/HM926710; reverse the fit logic when the cup rotates.
Typical equipment & failure modes
Common applications
- large shredder and recycler main shafts
- power-plant coal-mill and fan shafts
- rolling-mill pinion stands and roll-neck auxiliaries
- mine hoist and dragline drum shafts
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- At 127 mm bore the 4T-HM926747/HM926710 set is adjusted with hydraulic nuts or measured shims on mill and crane positions; manual torque methods cannot control preload at the 475 kN C level.
- The heavy-medium HM 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.
- An unloaded 4T-HM926747/HM926710 near 1,400 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- Inch and metric bores collide on paper — 127 mm is 5 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- The 475/620 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-HM926747/HM926710; 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-HM926747/HM926710?
4T-HM926747/HM926710 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 127 mm bore (5 in), 228.6 mm outside diameter and 53.975 mm assembled width T (9 × 2.125 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 620 kN, grease limiting speed 1,400 r/min, oil speed 1,900 r/min, mass about 8830 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-HM926747/HM926710 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the HM926747 cone or the HM926710 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 475/620 kN ratings change with the cup.
What is the difference between 4T-HM926747/HM926710 and a metric ISO 355 tapered bearing?
4T-HM926747/HM926710 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 127×228.6×53.975 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-HM926747/HM926710 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 HM926747/HM926710 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-HM926747/HM926710 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-HM926747/HM926710 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.