T7FC050 bearing: complete specifications & equivalents
The T7FC050 is a ISO 355 radial bearing sized 50 x 105 x 32 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 50 mm |
| Outer diameter D | 105 mm |
| Width B | 32 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 | 132 kN |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1220 g |
| Manufacturer designation | NTN T7FC050 |
| 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 & T7FC-series range
| Bore d | 1.969 in |
|---|---|
| Outer diameter D | 4.134 in |
| Width B | 1.26 in |
| ISO bore code | 50 |
| Radial section height (D−d)/2 | 27.5 mm |
| Smallest bore in T7FC-series | 45 mm |
| Largest outer diameter in T7FC-series | 160 mm |
| Width range across T7FC-series | 29–45 mm |
| Bore position in T7FC-series (smallest first) | 2 of 6 |
| Bore above smallest T7FC-series size | 5 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| T7FC050 | 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 T7FC050 model number is decoded
T7FC050 belongs to the NTN metric 4T tapered roller range (large-size ISO 355 tapered-roller family); the open bearing leaves sealing to the application and is normally ordered and mounted as an adjustable matched pair. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders T7FC050 by the metric ISO 355 number (ISO series abbreviation 7FC): 50 mm bore, 105 mm OD. Individually mounted, T7FC050 takes axial force in one direction only; two bearings are arranged face-to-face (X) or back-to-back (O) according to the moment stiffness and misalignment the shaft requires. The two speed columns differ by a factor of .76 (grease/limiting 3,400 vs oil 4,500 r/min); heat generation at the cone rib decides which lubrication a real T7FC050 arrangement can sustain. With a rotating shaft a k5/m5 shaft seat and a press-fit cup are typical catalogue practice for T7FC050; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.
Typical equipment & failure modes
Common applications
- truck and bus wheel hubs in paired arrangements
- industrial gearbox and speed-reducer shafts
- bevel and helical pinion drives with high thrust component
- pump and compressor drive shafts carrying combined load
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
- indentation of the raceways by hard particles in unsealed open arrangements
Selection pitfalls — read before you substitute
- Hub and pinion bearings of this 50 mm bore class are commonly adjusted in pairs; verify end play against the axle drawing and re-torque after bedding-in rather than trusting the initial preload on T7FC050.
- The large-size ISO 355 tapered-roller family at 50 mm bore (105×32 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 4,500 r/min oil ceiling.
- The 27.5 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for T7FC050 or the ring will bottom out on the radius instead of the shoulder face.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 50 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- Never fit the 50 mm cone by hammering the 105 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- The 119/132 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for T7FC050 (ISO 355 7FC); 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 T7FC050?
T7FC050 is a metric 4T tapered roller bearing to ISO 355: 50 mm bore, 105 mm outside diameter and 32 mm assembled width T (1.969 × 4.134 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 132 kN (2203E prints no Pu for this size), grease limiting speed 3,400 r/min, oil speed 4,500 r/min, mass about 1220 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on T7FC050?
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 (T7FC050); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the T7FC050 designation encode the 50 mm bore and what is 7FC?
trailing dimension block 050 prints the 50 mm bore directly for this large-size T-code. The 105 mm OD and 32 mm assembled T follow the ISO 355 dimension-series plan. 7FC 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 T7FC050 list two speeds, 3,400 and 4,500 r/min?
The lower figure, 3,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates T7FC050 at 4,500 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on T7FC050 mean?
The T2/T4/T7-style code is NTN's large-size tapered roller designation within ISO 355; it identifies the dimension series and 50 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.