15100-15245 bearing: complete specifications & equivalents
The 15100-15245 is a ANSI ABMA 19.2 radial bearing sized 25.4 x 62 x 19.05 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 25.4 mm |
| Outer diameter D | 62 mm |
| Width B | 19.05 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 52 kN |
| Basic static load rating C0 | 54 kN |
| Limiting speed (mechanical) | 6100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 301 g |
| Manufacturer designation | NTN 4T-15100/15245 |
| 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 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.75 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 18.3 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) | 19 of 148 |
| Bore above smallest 4t-inch-series size | 12.7 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 15100 | 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 15100-15245 model number is decoded
4T-15100/15245 is the NTN 4T catalogue entry for a 25.4×62×19.05 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 15100 identifies the cone of 25.4 mm (1 in) bore by catalogue lookup, and 15245 fixes the 62 mm OD. The 2.0 kN of dynamic capacity per millimetre of bore summarises the 52 kN rating over the 25.4 mm bore — sanity-check any interchange candidate against this ratio and the 19.05 mm T. Cup-side note for 15245: within the pure-numeric inch family tables the 15100 cone is listed against several cup options, and it is the cup that fixes the 62 mm OD and the 19.05 mm assembled width — quote the full 15100/15245 pair, never the cone alone. NTN grades inch 4T bearings as open bearings without integral seals; at 25.4 mm bore the application supplies sealing and the grease fill or oil feed.
Typical equipment & failure modes
Common applications
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
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
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 25.4 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-15100/15245.
- The pure-numeric inch family at 25.4 mm bore (62×19.05 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 15100/15245 reference at purchase.
- Grease packs must leave free volume inside the 19.05 mm-wide set; over-greasing a pair churning near the oil-band speed of 8,200 r/min raises temperature and destroys the setting.
- Open 4T-15100/15245 sets have no seals: a hub or gearbox needs external sealing or the 6,100 r/min grease figure is meaningless once water reaches the cone rib.
- Fit selection follows the rotating ring: a rotating cone on a 25.4 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- The 52/54 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-15100/15245; 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-15100/15245?
4T-15100/15245 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 25.4 mm bore (1 in), 62 mm outside diameter and 19.05 mm assembled width T (2.441 × 0.75 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 52 kN, C0 54 kN, grease limiting speed 6,100 r/min, oil speed 8,200 r/min, mass about 301 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-15100/15245 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 15100 cone or the 15245 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 52/54 kN ratings change with the cup.
What is the difference between 4T-15100/15245 and a metric ISO 355 tapered bearing?
4T-15100/15245 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 25.4×62×19.05 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-15100/15245 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 15100/15245 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-15100/15245 list two speeds, 6,100 and 8,200 r/min?
The lower figure, 6,100 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-15100/15245 at 8,200 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.