1380-1329 bearing: complete specifications & equivalents
The 1380-1329 is a ANSI ABMA 19.2 radial bearing sized 22.225 x 53.975 x 19.368 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 22.225 mm |
| Outer diameter D | 53.975 mm |
| Width B | 19.368 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 45 kN |
| Basic static load rating C0 | 43 kN |
| Limiting speed (mechanical) | 7600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 220 g |
| Manufacturer designation | NTN 4T-1380/1329 |
| 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 | 0.875 in |
|---|---|
| Outer diameter D | 2.125 in |
| Width B | 0.763 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 15.9 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) | 13 of 148 |
| Bore above smallest 4t-inch-series size | 9.525000000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 1380-1328-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN cone 4T-1380 paired with a different cup (1328): cone interchangeable, cup differs — OD, assembled width T and ratings follow the cup. Verify the full cone/cup reference before substituting. |
| 1380-1328 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
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 1380-1329 model number is decoded
For an inch shaft of 22.225 mm carrying combined radial and thrust load, NTN lists 4T-1380/1329, a single-row 4T tapered roller set of 45 kN C and 43 kN C0 inside the 53.975 mm OD cup. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 1380 identifies the cone of 22.225 mm (0.875 in) bore by catalogue lookup, and 1329 fixes the 53.975 mm OD. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 19.368 mm T of each 4T-1380/1329 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. Housing fitment sequence for 4T-1380/1329: press the 1329 cup square into the 53.975 mm seat first, then bring the 1380 cone (on its 22.225 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. A single-row tapered bearing reacts thrust in one direction only; 4T-1380/1329 is adjusted against a second bearing so the shaft is located in both directions.
Typical equipment & failure modes
Common applications
- utility-vehicle differential and pinion supports
- small machine-tool feed and spindle counter-supports
- light trailer and boat-trailer wheel hubs
- small agricultural implement wheels and auger drives
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- false brinelling on a stationary pair exposed to vibration during transport or standby
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- 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
- At 22.225 mm (0.875 in) bore the thin cone and cup distort under an over-tight shaft nut; set the 4T-1380/1329 pair with a dial indicator on end play rather than by locknut feel.
- The pure-numeric inch family at 22.225 mm bore (53.975×19.368 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 1380/1329 reference at purchase.
- Replacing one half of an adjusted pair without resetting end play negates the 19.368 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Inch and metric bores collide on paper — 22.225 mm is 0.875 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- Open 4T-1380/1329 sets have no seals: a hub or gearbox needs external sealing or the 7,600 r/min grease figure is meaningless once water reaches the cone rib.
- The 45/43 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-1380/1329; 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-1380/1329?
4T-1380/1329 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 22.225 mm bore (0.875 in), 53.975 mm outside diameter and 19.368 mm assembled width T (2.125 × 0.763 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 45 kN, C0 43 kN, grease limiting speed 7,600 r/min, oil speed 10,000 r/min, mass about 220 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-1380/1329 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 1380 cone or the 1329 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 45/43 kN ratings change with the cup.
What is the difference between 4T-1380/1329 and a metric ISO 355 tapered bearing?
4T-1380/1329 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 22.225×53.975×19.368 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-1380/1329 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 1380/1329 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-1380/1329 list two speeds, 7,600 and 10,000 r/min?
The lower figure, 7,600 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-1380/1329 at 10,000 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.