418-414-NTN bearing: complete specifications & equivalents
The 418-414-NTN is a ANSI ABMA 19.2 radial bearing sized 38.1 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 | 38.1 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 | 843 g |
| Manufacturer designation | NTN 4T-418/414 |
| 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 | 1.5 in |
|---|---|
| Outer diameter D | 3.484 in |
| Width B | 1.063 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25.2 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) | 42 of 148 |
| Bore above smallest 4t-inch-series size | 25.400000000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 418-414 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 38.1×88.5×26.988 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
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 418-414-NTN model number is decoded
4T-418/414 is the NTN 4T catalogue entry for a 38.1×88.5×26.988 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Cone and cup of 4T-418/414 are separately stocked parts: a worn 414 cup can be replaced against the existing 418 cone, provided the new cup carries the identical reference — pairing across references changes the 26.988 mm assembled width and the rating. The 25.2 mm radial section over the 38.1 mm bore positions the contact line of the pair; abutment shoulders and spacers are dimensioned from that geometry, not from the bore alone. The printed 106/107 kN ratings belong to the assembled 418+414 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. Fillet radii must clear the chamfers of the 418 cone and 414 cup; undercut shoulders seat the rings fully instead of bridging on a radius.
Typical equipment & failure modes
Common applications
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO 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
- indentation of the raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 38.1 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-418/414.
- The pure-numeric inch family at 38.1 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 418/414 reference at purchase.
- ABMA makes the 38.1×88.5 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.
- Never drive the 88.5 mm cup home through the rollers: fitting force goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Do not confuse T (26.988 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- The 106/107 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-418/414; 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-418/414?
4T-418/414 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 38.1 mm bore (1.5 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 843 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-418/414 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 418 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-418/414 and a metric ISO 355 tapered bearing?
4T-418/414 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 38.1×88.5×26.988 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-418/414 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 418/414 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-418/414 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-418/414 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.