T4CB100 bearing: complete specifications & equivalents
The T4CB100 is a ISO 355 radial bearing sized 100 x 145 x 24 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 100 mm |
| Outer diameter D | 145 mm |
| Width B | 24 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 119 kN |
| Basic static load rating C0 | 153 kN |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1140 g |
| Manufacturer designation | NTN T4CB100 |
| 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 | 3.937 in |
|---|---|
| Outer diameter D | 5.709 in |
| Width B | 0.945 in |
| ISO bore code | 00 |
| Radial section height (D−d)/2 | 22.5 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) | 1 of 3 |
| Bore above smallest T4CB-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| T4CB100 | 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 T4CB100 model number is decoded
T4CB100 is the NTN 4T catalogue entry for a 100×145×24 mm metric tapered roller bearing — separable cone and cup, designed for combined radial and axial load as an individually adjusted bearing. Reading the designation: the leading five digits follow the ISO 355 metric plan (dimension family plus two-digit bore code), and T4CB100 resolves to 100 mm bore; the NTN factory mark 4T is stamped on cone and cup but is a brand mark, not a size code, so the catalogue sku is printed without it. 2203E lists two speed ceilings for T4CB100: 1,800 r/min with grease lubrication (the limiting speed) and 2,400 r/min with oil, the higher oil value reflecting better heat removal from the cone rib. The two speed columns differ by a factor of .75 (grease/limiting 1,800 vs oil 2,400 r/min); heat generation at the cone rib decides which lubrication a real T4CB100 arrangement can sustain. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 100 mm pair is misadjusted and the 24 mm T set will edge-load in service.
Typical equipment & failure modes
Common applications
- heavy industrial gearboxes and crane travel drives
- rolling-mill auxiliary and pinion-stand shafts
- large conveyor and bucket-elevator pulleys
- mineral-processing feeder and crusher auxiliaries
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
Selection pitfalls — read before you substitute
- Mount the 100 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 1140 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The large-size ISO 355 tapered-roller family at 100 mm bore (145×24 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,400 r/min oil ceiling.
- Open T4CB100 units have no seals: a wheel-hub or gearbox application needs external sealing or the 1,800 r/min grease figure is meaningless once water reaches the cone rib.
- ISO 355 makes the 100×145 mm envelope interchangeable but not the ratings: NTN prints 119/153 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- Grease packs must leave free volume in the 24 mm-wide set; over-greasing a paired bearing churning at the 2,400 r/min oil-band speed raises temperature and destroys the preload setting.
- The 119/153 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for T4CB100 (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 T4CB100?
T4CB100 is a metric 4T tapered roller bearing to ISO 355: 100 mm bore, 145 mm outside diameter and 24 mm assembled width T (3.937 × 5.709 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 153 kN (2203E prints no Pu for this size), grease limiting speed 1,800 r/min, oil speed 2,400 r/min, mass about 1140 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on T4CB100?
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 (T4CB100); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the T4CB100 designation encode the 100 mm bore and what is 4CB?
trailing dimension block 100 prints the 100 mm bore directly for this large-size T-code. The 145 mm OD and 24 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 T4CB100 list two speeds, 1,800 and 2,400 r/min?
The lower figure, 1,800 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates T4CB100 at 2,400 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on T4CB100 mean?
The T2/T4/T7-style code is NTN's large-size tapered roller designation within ISO 355; it identifies the dimension series and 100 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.