28150-28300 bearing: complete specifications & equivalents
The 28150-28300 is a ANSI ABMA 19.2 radial bearing sized 38.1 x 76.2 x 20.638 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 | 76.2 mm |
| Width B | 20.638 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 61.5 kN |
| Basic static load rating C0 | 63 kN |
| Limiting speed (mechanical) | 5000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 406 g |
| Manufacturer designation | NTN 4T-28150/28300 |
| 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 in |
| Width B | 0.813 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 19.1 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) | 42 of 148 |
| Bore above smallest 4t-inch-series size | 25.400000000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 28150-28315 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN cone 4T-28150 paired with a different cup (28315): cone interchangeable, cup differs — OD, assembled width T and ratings follow the cup. Verify the full cone/cup reference 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 28150-28300 model number is decoded
4T-28150/28300 is an NTN inch-series single-row tapered roller bearing: a separable cone-and-cup pair on the ABMA inch boundary plan, 38.1×76.2×20.638 mm (assembled width T), for a shaft of about 38.1 mm (1.5 in). Cone and cup of 4T-28150/28300 are separately stocked parts: a worn 28300 cup can be replaced against the existing 28150 cone, provided the new cup carries the identical reference — pairing across references changes the 20.638 mm assembled width and the rating. The 1.6 kN of dynamic capacity per millimetre of bore summarises the 61.5 kN rating over the 38.1 mm bore — sanity-check any interchange candidate against this ratio and the 20.638 mm T. Housing fitment sequence for 4T-28150/28300: press the 28300 cup square into the 76.2 mm seat first, then bring the 28150 cone (on its 38.1 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Back-to-back (O) and face-to-face (X) arrangements of two 4T-28150/28300 sets react differently to shaft bending; choose the orientation for the moment load before locking shoulder geometry.
Typical equipment & failure modes
Common applications
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- edge loading when shaft deflection exceeds the few arc-minutes an adjusted pair tolerates
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-28150/28300.
- The pure-numeric inch family at 38.1 mm bore (76.2×20.638 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 28150/28300 reference at purchase.
- Inch and metric bores collide on paper — 38.1 mm is 1.5 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- Quote the full 28150/28300 pair at ordering: the 28150 cone also ships against sibling cups, and a cup from another reference changes the 20.638 mm assembled width and the rating.
- Fit selection follows the rotating ring: a rotating cone on a 38.1 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- The 61.5/63 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-28150/28300; 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-28150/28300?
4T-28150/28300 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 38.1 mm bore (1.5 in), 76.2 mm outside diameter and 20.638 mm assembled width T (3 × 0.813 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 61.5 kN, C0 63 kN, grease limiting speed 5,000 r/min, oil speed 6,700 r/min, mass about 406 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-28150/28300 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 28150 cone or the 28300 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 61.5/63 kN ratings change with the cup.
What is the difference between 4T-28150/28300 and a metric ISO 355 tapered bearing?
4T-28150/28300 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 38.1×76.2×20.638 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-28150/28300 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 28150/28300 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-28150/28300 list two speeds, 5,000 and 6,700 r/min?
The lower figure, 5,000 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-28150/28300 at 6,700 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.