HH224334-HH224310 bearing: complete specifications & equivalents
The HH224334-HH224310 is a ANSI ABMA 19.2 radial bearing sized 99.974 x 212.725 x 66.675 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 99.974 mm |
| Outer diameter D | 212.725 mm |
| Width B | 66.675 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 635 kN |
| Basic static load rating C0 | 810 kN |
| Limiting speed (mechanical) | 1700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 11500 g |
| Manufacturer designation | NTN 4T-HH224334/HH224310 |
| 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 | 3.936 in |
|---|---|
| Outer diameter D | 8.375 in |
| Width B | 2.625 in |
| ISO bore code | 34 |
| Radial section height (D−d)/2 | 56.4 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) | 116 of 148 |
| Bore above smallest 4t-inch-series size | 87.274 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HH224334-310 | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
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 HH224334-HH224310 model number is decoded
4T-HH224334/HH224310 is an NTN inch-series single-row tapered roller bearing: a separable cone-and-cup pair on the ABMA inch boundary plan, 99.974×212.725×66.675 mm (assembled width T), for a shaft of about 99.974 mm (3.936 in). The 4T prefix is NTN's tapered roller quality mark stamped on both parts; it is a brand mark, not a size code, so cross-references quote HH224334/HH224310 without it. Speed planning uses both catalogue columns: grease 1,700 r/min is the mechanical ceiling for 4T-HH224334/HH224310, oil 2,300 r/min with circulating oil — a 600 r/min margin at this size. Cup-side note for HH224310: within the extra-heavy HH family tables the HH224334 cone is listed against several cup options, and it is the cup that fixes the 212.725 mm OD and the 66.675 mm assembled width — quote the full HH224334/HH224310 pair, never the cone alone. Fillet radii must clear the chamfers of the HH224334 cone and HH224310 cup; undercut shoulders seat the rings fully instead of bridging on a radius.
Typical equipment & failure modes
Common applications
- large conveyor head pulleys in bulk-handling plant
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- 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
- Mount the 99.974 mm cone by induction heating (max 120 °C) and the 212.725 mm cup with a press sleeve; at 11500 g a cocked ring brinells the raceway directly.
- The extra-heavy HH family is proportioned for a high thrust share; swapping to a lighter LM or pure-numeric series at the same 99.974 mm bore cuts axial capacity even when the envelope fits — re-verify the load split before downgrading.
- Do not confuse T (66.675 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- An unloaded 4T-HH224334/HH224310 near 1,700 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- Grease packs must leave free volume inside the 66.675 mm-wide set; over-greasing a pair churning near the oil-band speed of 2,300 r/min raises temperature and destroys the setting.
- The 635/810 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-HH224334/HH224310; 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-HH224334/HH224310?
4T-HH224334/HH224310 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 99.974 mm bore (3.936 in), 212.725 mm outside diameter and 66.675 mm assembled width T (8.375 × 2.625 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 635 kN, C0 810 kN, grease limiting speed 1,700 r/min, oil speed 2,300 r/min, mass about 11500 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-HH224334/HH224310 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the HH224334 cone or the HH224310 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 635/810 kN ratings change with the cup.
What is the difference between 4T-HH224334/HH224310 and a metric ISO 355 tapered bearing?
4T-HH224334/HH224310 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 99.974×212.725×66.675 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-HH224334/HH224310 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 HH224334/HH224310 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-HH224334/HH224310 list two speeds, 1,700 and 2,300 r/min?
The lower figure, 1,700 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-HH224334/HH224310 at 2,300 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.