28995-28920 bearing: complete specifications & equivalents
The 28995-28920 is a ANSI ABMA 19.2 radial bearing sized 62.738 x 101.6 x 25.4 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 62.738 mm |
| Outer diameter D | 101.6 mm |
| Width B | 25.4 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 100 kN |
| Basic static load rating C0 | 134 kN |
| Limiting speed (mechanical) | 3500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 762 g |
| Manufacturer designation | NTN 4T-28995/28920 |
| 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 | 2.47 in |
|---|---|
| Outer diameter D | 4 in |
| Width B | 1 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 19.4 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) | 80 of 148 |
| Bore above smallest 4t-inch-series size | 50.038 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 28995 | 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 28995-28920 model number is decoded
4T-28995/28920 belongs to the NTN inch 4T tapered roller range (pure-numeric inch family); cone and cup are ordered by their own references and are individually interchangeable with like-numbered parts. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 28995 identifies the cone of 62.738 mm (2.47 in) bore by catalogue lookup, and 28920 fixes the 101.6 mm OD. The 19.4 mm radial section over the 62.738 mm bore positions the contact line of the pair; abutment shoulders and spacers are dimensioned from that geometry, not from the bore alone. Cup-side note for 28920: within the pure-numeric inch family tables the 28995 cone is listed against several cup options, and it is the cup that fixes the 101.6 mm OD and the 25.4 mm assembled width — quote the full 28995/28920 pair, never the cone alone. After bedding-in, re-check the end play of the adjusted 4T-28995/28920 pair — initial seating of the ring faces relaxes the setting slightly.
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
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Mount the 62.738 mm cone by induction heating (max 120 °C) and the 101.6 mm cup with a press sleeve; at 762 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 62.738 mm bore (101.6×25.4 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 28995/28920 reference at purchase.
- Shaft and housing fillets must clear the ring chamfers of 28995 and 28920; use undercut shoulders so the rings seat on the face, not on a radius.
- Grease packs must leave free volume inside the 25.4 mm-wide set; over-greasing a pair churning near the oil-band speed of 4,700 r/min raises temperature and destroys the setting.
- ABMA makes the 62.738×101.6 mm envelope interchangeable, not the ratings: NTN prints 100/134 kN for this execution and another make of the same number can differ in roller complement.
- The 100/134 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-28995/28920; 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-28995/28920?
4T-28995/28920 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 62.738 mm bore (2.47 in), 101.6 mm outside diameter and 25.4 mm assembled width T (4 × 1 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 134 kN, grease limiting speed 3,500 r/min, oil speed 4,700 r/min, mass about 762 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-28995/28920 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 28995 cone or the 28920 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 100/134 kN ratings change with the cup.
What is the difference between 4T-28995/28920 and a metric ISO 355 tapered bearing?
4T-28995/28920 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 62.738×101.6×25.4 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-28995/28920 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 28995/28920 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-28995/28920 list two speeds, 3,500 and 4,700 r/min?
The lower figure, 3,500 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-28995/28920 at 4,700 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.