29585-29520 bearing: complete specifications & equivalents
The 29585-29520 is a ANSI ABMA 19.2 radial bearing sized 63.5 x 107.95 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 | 63.5 mm |
| Outer diameter D | 107.95 mm |
| Width B | 25.4 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 101 kN |
| Basic static load rating C0 | 140 kN |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 924 g |
| Manufacturer designation | NTN 4T-29585/29520 |
| 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 | 2.5 in |
|---|---|
| Outer diameter D | 4.25 in |
| Width B | 1 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 22.2 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) | 81 of 148 |
| Bore above smallest 4t-inch-series size | 50.8 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29585-29521 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN cone 4T-29585 paired with a different cup (29521): 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 29585-29520 model number is decoded
4T-29585/29520 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. Reading the designation: 4T-29585/29520 follows the ABMA inch convention — the number before the slash is the cone (inner ring with roller set and cage), the number after the slash is the cup (outer ring), and the pure-numeric inch family lettering ties the pair to its boundary plan. Selection: C 101 kN against C0 140 kN gives a C0/C ratio of 1.39 for the 63.5 mm bore; the pair is counted as one adjusted unit when checking L10 at the equivalent combined load. Cup-side note for 29520: within the pure-numeric inch family tables the 29585 cone is listed against several cup options, and it is the cup that fixes the 107.95 mm OD and the 25.4 mm assembled width — quote the full 29585/29520 pair, never the cone alone. Minimum load matters at speed: an unloaded 4T-29585/29520 run near 3,200 r/min lets the rollers skid; lightly spring-preload high-speed pair arrangements.
Typical equipment & failure modes
Common applications
- large conveyor head pulleys in bulk-handling plant
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- false brinelling on a stationary pair exposed to vibration during transport or standby
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- 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 63.5 mm cone by induction heating (max 120 °C) and the 107.95 mm cup with a press sleeve; at 924 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 63.5 mm bore (107.95×25.4 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 29585/29520 reference at purchase.
- Inch and metric bores collide on paper — 63.5 mm is 2.5 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- Replacing one half of an adjusted pair without resetting end play negates the 25.4 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Inch and metric bores collide on paper — 63.5 mm is 2.5 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- The 101/140 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-29585/29520; 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-29585/29520?
4T-29585/29520 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 63.5 mm bore (2.5 in), 107.95 mm outside diameter and 25.4 mm assembled width T (4.25 × 1 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 101 kN, C0 140 kN, grease limiting speed 3,200 r/min, oil speed 4,300 r/min, mass about 924 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-29585/29520 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 29585 cone or the 29520 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 101/140 kN ratings change with the cup.
What is the difference between 4T-29585/29520 and a metric ISO 355 tapered bearing?
4T-29585/29520 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 63.5×107.95×25.4 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-29585/29520 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 29585/29520 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-29585/29520 list two speeds, 3,200 and 4,300 r/min?
The lower figure, 3,200 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-29585/29520 at 4,300 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.