45287-45220 bearing: complete specifications & equivalents
The 45287-45220 is a ANSI ABMA 19.2 radial bearing sized 53.975 x 104.775 x 30.162 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 53.975 mm |
| Outer diameter D | 104.775 mm |
| Width B | 30.162 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 144 kN |
| Basic static load rating C0 | 169 kN |
| Limiting speed (mechanical) | 3500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1170 g |
| Manufacturer designation | NTN 4T-45287/45220 |
| 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 | 2.125 in |
|---|---|
| Outer diameter D | 4.125 in |
| Width B | 1.187 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25.4 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) | 67 of 148 |
| Bore above smallest 4t-inch-series size | 41.275000000000006 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 45287 | 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 45287-45220 model number is decoded
For an inch shaft of 53.975 mm carrying combined radial and thrust load, NTN lists 4T-45287/45220, a single-row 4T tapered roller set of 144 kN C and 169 kN C0 inside the 104.775 mm OD cup. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 45287 identifies the cone of 53.975 mm (2.125 in) bore by catalogue lookup, and 45220 fixes the 104.775 mm OD. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 30.162 mm T of each 4T-45287/45220 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. Housing fitment sequence for 4T-45287/45220: press the 45220 cup square into the 104.775 mm seat first, then bring the 45287 cone (on its 53.975 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. NTN grades inch 4T bearings as open bearings without integral seals; at 53.975 mm bore the application supplies sealing and the grease fill or oil feed.
Typical equipment & failure modes
Common applications
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
- truck and trailer axle hubs on inch-dimensioned axles
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- 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
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 53.975 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-45287/45220.
- The pure-numeric inch family at 53.975 mm bore (104.775×30.162 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 45287/45220 reference at purchase.
- Never drive the 104.775 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.
- Fit selection follows the rotating ring: a rotating cone on a 53.975 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- Shaft and housing fillets must clear the ring chamfers of 45287 and 45220; use undercut shoulders so the rings seat on the face, not on a radius.
- The 144/169 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-45287/45220; 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-45287/45220?
4T-45287/45220 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 53.975 mm bore (2.125 in), 104.775 mm outside diameter and 30.162 mm assembled width T (4.125 × 1.187 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 144 kN, C0 169 kN, grease limiting speed 3,500 r/min, oil speed 4,700 r/min, mass about 1170 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-45287/45220 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 45287 cone or the 45220 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 144/169 kN ratings change with the cup.
What is the difference between 4T-45287/45220 and a metric ISO 355 tapered bearing?
4T-45287/45220 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 53.975×104.775×30.162 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-45287/45220 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 45287/45220 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-45287/45220 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-45287/45220 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.