T4CB140 bearing: complete specifications & equivalents
The T4CB140 is a ISO 355 radial bearing sized 140 x 195 x 29 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 140 mm |
| Outer diameter D | 195 mm |
| Width B | 29 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 208 kN |
| Basic static load rating C0 | 299 kN |
| Limiting speed (mechanical) | 1700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2350 g |
| Manufacturer designation | NTN T4CB140 |
| Standard | ISO 355 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); 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 & T4CB-series range
| Bore d | 5.512 in |
|---|---|
| Outer diameter D | 7.677 in |
| Width B | 1.142 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 27.5 mm |
| Smallest bore in T4CB-series | 100 mm |
| Largest outer diameter in T4CB-series | 195 mm |
| Width range across T4CB-series | 24–29 mm |
| Bore position in T4CB-series (smallest first) | 3 of 3 |
| Bore above smallest T4CB-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| T4CB140 | 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 T4CB140 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number T4CB140 denotes the large-size ISO 355 tapered-roller family of metric tapered roller bearings, 140 mm bore, 195 mm outside diameter and 29 mm assembled width T (5.512 × 7.677 × 1.142 in) to the ISO 355 boundary plan. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 4CB, which is the maker-neutral cross-reference for the 140×195 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. The 27.5 mm radial section carries the roller complement across the 140–195 mm envelope; section and contact angle differ between NTN metric families even at the same bore, so 302/322/323 are not drop-in swaps. Catalogue mass of the T4CB140 set is 2350 g (0.093 lb cone + cup); abutment and shaft shoulder design must carry that mass square to the axis. Fillet radii must clear the ring chamfers of the 195 mm cup and 140 mm cone; use undercut shoulders so the rings seat fully rather than bridging on a shaft radius.
Typical equipment & failure modes
Common applications
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
- rolling-mill roll-neck and gearbox positions
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- edge loading when shaft deflection exceeds the few arc-minutes of misalignment the adjusted pair allows
Selection pitfalls — read before you substitute
- At 140 mm bore the T4CB140 set is adjusted with hydraulic nuts on large mill and wind positions; follow the drive-up angle/end-play procedure, because manual torque methods cannot control preload at the 208 kN C level.
- The large-size ISO 355 tapered-roller family at 140 mm bore (195×29 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,200 r/min oil ceiling.
- Replacing one half of an adjusted pair without resetting end play negates the 29 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 140 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering T4CB140 by size alone can deliver the wrong contact-angle execution for a pinion position.
- The 208/299 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for T4CB140 (ISO 355 4CB); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN T4CB140?
T4CB140 is a metric 4T tapered roller bearing to ISO 355: 140 mm bore, 195 mm outside diameter and 29 mm assembled width T (5.512 × 7.677 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 208 kN, C0 299 kN (2203E prints no Pu for this size), grease limiting speed 1,700 r/min, oil speed 2,200 r/min, mass about 2350 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on T4CB140?
4T is NTN's tapered roller bearing brand mark, stamped on the cone and cup in the factory. It identifies the NTN 4T programme and is not a dimension, so the catalogue and this page list the bare ISO 355 number (T4CB140); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the T4CB140 designation encode the 140 mm bore and what is 4CB?
trailing dimension block 140 prints the 140 mm bore directly for this large-size T-code. The 195 mm OD and 29 mm assembled T follow the ISO 355 dimension-series plan. 4CB is the maker-neutral ISO 355 abbreviation for this dimension series (the same code other manufacturers print); 4T is NTN's own brand mark.
Why does T4CB140 list two speeds, 1,700 and 2,200 r/min?
The lower figure, 1,700 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates T4CB140 at 2,200 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on T4CB140 mean?
The T2/T4/T7-style code is NTN's large-size tapered roller designation within ISO 355; it identifies the dimension series and 140 mm bore directly, and remains an open 4T execution ordered under its own code.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.