655-653 bearing: complete specifications & equivalents
The 655-653 is a ANSI ABMA 19.2 radial bearing sized 69.85 x 146.05 x 41.275 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 69.85 mm |
| Outer diameter D | 146.05 mm |
| Width B | 41.275 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 228 kN |
| Basic static load rating C0 | 295 kN |
| Limiting speed (mechanical) | 2500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3280 g |
| Manufacturer designation | NTN 4T-655/653 |
| 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 | 2.75 in |
|---|---|
| Outer diameter D | 5.75 in |
| Width B | 1.625 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 38.1 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) | 86 of 148 |
| Bore above smallest 4t-inch-series size | 57.14999999999999 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 655-652 | 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 655-653 model number is decoded
4T-655/653 is an NTN inch-series single-row tapered roller bearing: a separable cone-and-cup pair on the ABMA inch boundary plan, 69.85×146.05×41.275 mm (assembled width T), for a shaft of about 69.85 mm (2.75 in). Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 655 identifies the cone of 69.85 mm (2.75 in) bore by catalogue lookup, and 653 fixes the 146.05 mm OD. Selection: C 228 kN against C0 295 kN gives a C0/C ratio of 1.29 for the 69.85 mm bore; the pair is counted as one adjusted unit when checking L10 at the equivalent combined load. Housing fitment sequence for 4T-655/653: press the 653 cup square into the 146.05 mm seat first, then bring the 655 cone (on its 69.85 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Running clearance of 4T-655/653 is set at mounting by axial displacement of cone or cup — the catalogue does not ship a preloaded set, so the drawing must state end play or preload.
Typical equipment & failure modes
Common applications
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
- crusher and screening-plant eccentric shafts
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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
- cage fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Mount the 69.85 mm cone by induction heating (max 120 °C) and the 146.05 mm cup with a press sleeve; at 3280 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 69.85 mm bore (146.05×41.275 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 655/653 reference at purchase.
- Replacing one half of an adjusted pair without resetting end play negates the 41.275 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Quote the full 655/653 pair at ordering: the 655 cone also ships against sibling cups, and a cup from another reference changes the 41.275 mm assembled width and the rating.
- An unloaded 4T-655/653 near 2,500 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- The 228/295 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-655/653; 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-655/653?
4T-655/653 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 69.85 mm bore (2.75 in), 146.05 mm outside diameter and 41.275 mm assembled width T (5.75 × 1.625 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 228 kN, C0 295 kN, grease limiting speed 2,500 r/min, oil speed 3,300 r/min, mass about 3280 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-655/653 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 655 cone or the 653 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 228/295 kN ratings change with the cup.
What is the difference between 4T-655/653 and a metric ISO 355 tapered bearing?
4T-655/653 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 69.85×146.05×41.275 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-655/653 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 655/653 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-655/653 list two speeds, 2,500 and 3,300 r/min?
The lower figure, 2,500 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-655/653 at 3,300 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.