H414245-H414210 bearing: complete specifications & equivalents
The H414245-H414210 is a ANSI ABMA 19.2 radial bearing sized 68.262 x 136.525 x 41.275 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 68.262 mm |
| Outer diameter D | 136.525 mm |
| Width B | 41.275 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 251 kN |
| Basic static load rating C0 | 293 kN |
| Limiting speed (mechanical) | 2700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2700 g |
| Manufacturer designation | NTN 4T-H414245/H414210 |
| 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 | 2.687 in |
|---|---|
| Outer diameter D | 5.375 in |
| Width B | 1.625 in |
| ISO bore code | 45 |
| Radial section height (D−d)/2 | 34.1 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) | 85 of 148 |
| Bore above smallest 4t-inch-series size | 55.562 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| H414245 | 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 H414245-H414210 model number is decoded
4T-H414245/H414210 belongs to the NTN inch 4T tapered roller range (heavy H 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 — H414245 sits in the heavy H family. The 3.7 kN of dynamic capacity per millimetre of bore summarises the 251 kN rating over the 68.262 mm bore — sanity-check any interchange candidate against this ratio and the 41.275 mm T. The printed 251/293 kN ratings belong to the assembled H414245+H414210 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. Back-to-back (O) and face-to-face (X) arrangements of two 4T-H414245/H414210 sets react differently to shaft bending; choose the orientation for the moment load before locking shoulder geometry.
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
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- false brinelling on a stationary pair exposed to vibration during transport or standby
- cage fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- indentation of the raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- Mount the 68.262 mm cone by induction heating (max 120 °C) and the 136.525 mm cup with a press sleeve; at 2700 g a cocked ring brinells the raceway directly.
- The heavy H family at 68.262 mm bore (136.525×41.275 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full H414245/H414210 reference at purchase.
- Open 4T-H414245/H414210 sets have no seals: a hub or gearbox needs external sealing or the 2,700 r/min grease figure is meaningless once water reaches the cone rib.
- ABMA makes the 68.262×136.525 mm envelope interchangeable, not the ratings: NTN prints 251/293 kN for this execution and another make of the same number can differ in roller complement.
- Open 4T-H414245/H414210 sets have no seals: a hub or gearbox needs external sealing or the 2,700 r/min grease figure is meaningless once water reaches the cone rib.
- The 251/293 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-H414245/H414210; 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-H414245/H414210?
4T-H414245/H414210 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 68.262 mm bore (2.687 in), 136.525 mm outside diameter and 41.275 mm assembled width T (5.375 × 1.625 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 251 kN, C0 293 kN, grease limiting speed 2,700 r/min, oil speed 3,700 r/min, mass about 2700 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-H414245/H414210 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the H414245 cone or the H414210 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 251/293 kN ratings change with the cup.
What is the difference between 4T-H414245/H414210 and a metric ISO 355 tapered bearing?
4T-H414245/H414210 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 68.262×136.525×41.275 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-H414245/H414210 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 H414245/H414210 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-H414245/H414210 list two speeds, 2,700 and 3,700 r/min?
The lower figure, 2,700 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-H414245/H414210 at 3,700 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.