HM926740-HM926710 bearing: complete specifications & equivalents
The HM926740-HM926710 is a ANSI ABMA 19.2 radial bearing sized 114.3 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 | 114.3 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 | 9760 g |
| Manufacturer designation | NTN 4T-HM926740/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 | 4.5 in |
|---|---|
| Outer diameter D | 9 in |
| Width B | 2.125 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 57.1 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) | 127 of 148 |
| Bore above smallest 4t-inch-series size | 101.6 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM926740 | 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 HM926740-HM926710 model number is decoded
4T-HM926740/HM926710 is the NTN 4T catalogue entry for a 114.3×228.6×53.975 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: HM926740 identifies the cone of 114.3 mm (4.5 in) bore by catalogue lookup, and HM926710 fixes the 228.6 mm OD. Contact-angle geometry of the heavy-medium HM family gives 4T-HM926740/HM926710 its radial/axial load split — at 475/620 kN the static rating is about 1.31× C, typical of inch tapered sets proportioned for combined duty. Housing fitment sequence for 4T-HM926740/HM926710: press the HM926710 cup square into the 228.6 mm seat first, then bring the HM926740 cone (on its 114.3 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. After bedding-in, re-check the end play of the adjusted 4T-HM926740/HM926710 pair — initial seating of the ring faces relaxes the setting slightly.
Typical equipment & failure modes
Common applications
- power-plant coal-mill and fan shafts
- rolling-mill pinion stands and roll-neck auxiliaries
- mine hoist and dragline drum shafts
- heavy press and forging-machine drive 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
- 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
- At 114.3 mm bore the 4T-HM926740/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 114.3 mm bore cuts axial capacity even when the envelope fits — re-verify the load split before downgrading.
- Open 4T-HM926740/HM926710 sets have no seals: a hub or gearbox needs external sealing or the 1,400 r/min grease figure is meaningless once water reaches the cone rib.
- Shaft and housing fillets must clear the ring chamfers of HM926740 and HM926710; use undercut shoulders so the rings seat on the face, not on a radius.
- Grease packs must leave free volume inside the 53.975 mm-wide set; over-greasing a pair churning near the oil-band speed of 1,900 r/min raises temperature and destroys the setting.
- The 475/620 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-HM926740/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-HM926740/HM926710?
4T-HM926740/HM926710 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 114.3 mm bore (4.5 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 9760 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-HM926740/HM926710 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the HM926740 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-HM926740/HM926710 and a metric ISO 355 tapered bearing?
4T-HM926740/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 114.3×228.6×53.975 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-HM926740/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 HM926740/HM926710 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-HM926740/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-HM926740/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.