17118-17244 bearing: complete specifications & equivalents
The 17118-17244 is a ANSI ABMA 19.2 radial bearing sized 29.987 x 62 x 16.002 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 29.987 mm |
| Outer diameter D | 62 mm |
| Width B | 16.002 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 43 kN |
| Basic static load rating C0 | 42 kN |
| Limiting speed (mechanical) | 6300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 229 g |
| Manufacturer designation | NTN 4T-17118/17244 |
| 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 | 1.181 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.63 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 16 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) | 26 of 148 |
| Bore above smallest 4t-inch-series size | 17.287 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 17118 | 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 17118-17244 model number is decoded
For an inch shaft of 29.987 mm carrying combined radial and thrust load, NTN lists 4T-17118/17244, a single-row 4T tapered roller set of 43 kN C and 42 kN C0 inside the 62 mm OD cup. Cone and cup of 4T-17118/17244 are separately stocked parts: a worn 17244 cup can be replaced against the existing 17118 cone, provided the new cup carries the identical reference — pairing across references changes the 16.002 mm assembled width and the rating. Speed planning uses both catalogue columns: grease 6,300 r/min is the mechanical ceiling for 4T-17118/17244, oil 8,400 r/min with circulating oil — a 2,100 r/min margin at this size. The printed 43/42 kN ratings belong to the assembled 17118+17244 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. After bedding-in, re-check the end play of the adjusted 4T-17118/17244 pair — initial seating of the ring faces relaxes the setting slightly.
Typical equipment & failure modes
Common applications
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- indentation of the raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 29.987 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-17118/17244.
- The pure-numeric inch family at 29.987 mm bore (62×16.002 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 17118/17244 reference at purchase.
- Shaft and housing fillets must clear the ring chamfers of 17118 and 17244; use undercut shoulders so the rings seat on the face, not on a radius.
- Open 4T-17118/17244 sets have no seals: a hub or gearbox needs external sealing or the 6,300 r/min grease figure is meaningless once water reaches the cone rib.
- Inch and metric bores collide on paper — 29.987 mm is 1.181 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- The 43/42 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-17118/17244; 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-17118/17244?
4T-17118/17244 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 29.987 mm bore (1.181 in), 62 mm outside diameter and 16.002 mm assembled width T (2.441 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 43 kN, C0 42 kN, grease limiting speed 6,300 r/min, oil speed 8,400 r/min, mass about 229 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-17118/17244 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 17118 cone or the 17244 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 43/42 kN ratings change with the cup.
What is the difference between 4T-17118/17244 and a metric ISO 355 tapered bearing?
4T-17118/17244 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 29.987×62×16.002 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-17118/17244 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 17118/17244 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-17118/17244 list two speeds, 6,300 and 8,400 r/min?
The lower figure, 6,300 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-17118/17244 at 8,400 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.