420-414 bearing: complete specifications & equivalents
The 420-414 is a ANSI ABMA 19.2 radial bearing sized 40 x 88.5 x 26.988 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 40 mm |
| Outer diameter D | 88.5 mm |
| Width B | 26.988 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 106 kN |
| Basic static load rating C0 | 107 kN |
| Limiting speed (mechanical) | 4600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 817 g |
| Manufacturer designation | NTN 4T-420/414 |
| 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 | 1.575 in |
|---|---|
| Outer diameter D | 3.484 in |
| Width B | 1.063 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 24.3 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) | 44 of 148 |
| Bore above smallest 4t-inch-series size | 27.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 420 | 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 420-414 model number is decoded
For an inch shaft of 40 mm carrying combined radial and thrust load, NTN lists 4T-420/414, a single-row 4T tapered roller set of 106 kN C and 107 kN C0 inside the 88.5 mm OD cup. 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 420/414 without it. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 26.988 mm T of each 4T-420/414 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. Housing fitment sequence for 4T-420/414: press the 414 cup square into the 88.5 mm seat first, then bring the 420 cone (on its 40 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Fillet radii must clear the chamfers of the 420 cone and 414 cup; undercut shoulders seat the rings fully instead of bridging on a radius.
Typical equipment & failure modes
Common applications
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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 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
- Hub and pinion positions of this 40 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-420/414.
- The pure-numeric inch family at 40 mm bore (88.5×26.988 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 420/414 reference at purchase.
- ABMA makes the 40×88.5 mm envelope interchangeable, not the ratings: NTN prints 106/107 kN for this execution and another make of the same number can differ in roller complement.
- Quote the full 420/414 pair at ordering: the 420 cone also ships against sibling cups, and a cup from another reference changes the 26.988 mm assembled width and the rating.
- Shaft and housing fillets must clear the ring chamfers of 420 and 414; use undercut shoulders so the rings seat on the face, not on a radius.
- The 106/107 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-420/414; 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-420/414?
4T-420/414 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 40 mm bore (1.575 in), 88.5 mm outside diameter and 26.988 mm assembled width T (3.484 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 106 kN, C0 107 kN, grease limiting speed 4,600 r/min, oil speed 6,100 r/min, mass about 817 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-420/414 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 420 cone or the 414 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 106/107 kN ratings change with the cup.
What is the difference between 4T-420/414 and a metric ISO 355 tapered bearing?
4T-420/414 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 40×88.5×26.988 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-420/414 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 420/414 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-420/414 list two speeds, 4,600 and 6,100 r/min?
The lower figure, 4,600 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-420/414 at 6,100 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.