HM88547-HM88510 bearing: complete specifications & equivalents
The HM88547-HM88510 is a ANSI ABMA 19.2 radial bearing sized 33.338 x 73.025 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 | 33.338 mm |
| Outer diameter D | 73.025 mm |
| Width B | 29.37 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 80 kN |
| Basic static load rating C0 | 97 kN |
| Limiting speed (mechanical) | 5400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 603 g |
| Manufacturer designation | NTN 4T-HM88547/HM88510 |
| 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 | 1.313 in |
|---|---|
| Outer diameter D | 2.875 in |
| Width B | 1.156 in |
| ISO bore code | 47 |
| Radial section height (D−d)/2 | 19.8 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) | 33 of 148 |
| Bore above smallest 4t-inch-series size | 20.638 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM88547 | 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 HM88547-HM88510 model number is decoded
4T-HM88547/HM88510 is an NTN inch-series single-row tapered roller bearing: a separable cone-and-cup pair on the ABMA inch boundary plan, 33.338×73.025×29.37 mm (assembled width T), for a shaft of about 33.338 mm (1.313 in). Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: HM88547 identifies the cone of 33.338 mm (1.313 in) bore by catalogue lookup, and HM88510 fixes the 73.025 mm OD. Contact-angle geometry of the heavy-medium HM family gives 4T-HM88547/HM88510 its radial/axial load split — at 80/97 kN the static rating is about 1.21× C, typical of inch tapered sets proportioned for combined duty. Cup-side note for HM88510: within the heavy-medium HM family tables the HM88547 cone is listed against several cup options, and it is the cup that fixes the 73.025 mm OD and the 29.37 mm assembled width — quote the full HM88547/HM88510 pair, never the cone alone. Mount the 33.338 mm cone with an induction heater (max 120 °C) and press the 73.025 mm cup with a sleeve; driving either ring through the rollers brinells the raceways.
Typical equipment & failure modes
Common applications
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
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 damage from a mounting blow transmitted through the roller complement
- 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 33.338 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-HM88547/HM88510.
- The heavy-medium HM family is proportioned for a high thrust share; swapping to a lighter LM or pure-numeric series at the same 33.338 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 29.37 mm-wide set; over-greasing a pair churning near the oil-band speed of 7,100 r/min raises temperature and destroys the setting.
- An unloaded 4T-HM88547/HM88510 near 5,400 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- An unloaded 4T-HM88547/HM88510 near 5,400 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- The 80/97 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-HM88547/HM88510; 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-HM88547/HM88510?
4T-HM88547/HM88510 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 33.338 mm bore (1.313 in), 73.025 mm outside diameter and 29.37 mm assembled width T (2.875 × 1.156 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 80 kN, C0 97 kN, grease limiting speed 5,400 r/min, oil speed 7,100 r/min, mass about 603 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-HM88547/HM88510 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the HM88547 cone or the HM88510 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 80/97 kN ratings change with the cup.
What is the difference between 4T-HM88547/HM88510 and a metric ISO 355 tapered bearing?
4T-HM88547/HM88510 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 33.338×73.025×29.37 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-HM88547/HM88510 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 HM88547/HM88510 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-HM88547/HM88510 list two speeds, 5,400 and 7,100 r/min?
The lower figure, 5,400 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-HM88547/HM88510 at 7,100 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.