28150-28315 bearing: complete specifications & equivalents
The 28150-28315 is a ANSI ABMA 19.2 radial bearing sized 38.1 x 80 x 21.006 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 | 80 mm |
| Width B | 21.006 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 | 467 g |
| Manufacturer designation | NTN 4T-28150/28315 |
| 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 | 3.15 in |
| Width B | 0.827 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 20.9 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) | 42 of 148 |
| Bore above smallest 4t-inch-series size | 25.400000000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 28150-28300 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN cone 4T-28150 paired with a different cup (28300): 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 28150-28315 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-28150/28315 denotes the pure-numeric inch family of NTN inch tapered roller bearings — cone 28150 and cup 28315 delivered as a matched, separable pair of 38.1 mm bore and 80 mm outside diameter. 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 28150/28315 without it. 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 21.006 mm T. Housing fitment sequence for 4T-28150/28315: press the 28315 cup square into the 80 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. After bedding-in, re-check the end play of the adjusted 4T-28150/28315 pair — initial seating of the ring faces relaxes the setting slightly.
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
- 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-28150/28315.
- The pure-numeric inch family at 38.1 mm bore (80×21.006 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 28150/28315 reference at purchase.
- Grease packs must leave free volume inside the 21.006 mm-wide set; over-greasing a pair churning near the oil-band speed of 6,700 r/min raises temperature and destroys the setting.
- Do not confuse T (21.006 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Do not confuse T (21.006 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- The 61.5/63 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-28150/28315; 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-28150/28315?
4T-28150/28315 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 38.1 mm bore (1.5 in), 80 mm outside diameter and 21.006 mm assembled width T (3.15 × 0.827 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 467 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-28150/28315 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 28150 cone or the 28315 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-28150/28315 and a metric ISO 355 tapered bearing?
4T-28150/28315 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 38.1×80×21.006 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-28150/28315 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 28150/28315 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-28150/28315 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-28150/28315 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.