T7FC070 bearing: complete specifications & equivalents
The T7FC070 is a ISO 355 radial bearing sized 70 x 140 x 39 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 70 mm |
| Outer diameter D | 140 mm |
| Width B | 39 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 191 kN |
| Basic static load rating C0 | 231 kN |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2620 g |
| Manufacturer designation | NTN T7FC070 |
| 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 | 2.756 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 1.535 in |
| ISO bore code | 70 |
| Radial section height (D−d)/2 | 35 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) | 5 of 6 |
| Bore above smallest T7FC-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| T7FC070 | 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 T7FC070 model number is decoded
For a 70 mm shaft with a thrust component, NTN lists T7FC070, a metric 4T tapered roller bearing of 191 kN C and 231 kN C0 inside the 140 mm OD, 39 mm-wide assembled set. Reading the designation: the leading five digits follow the ISO 355 metric plan (dimension family plus two-digit bore code), and T7FC070 resolves to 70 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. NTN grades 4T metric bearings as open bearings without integral seals; at 70 mm bore the application supplies the seals and the grease fill or oil supply to the 7FC ISO 355 assembly. Speed planning uses both catalogue columns: grease 2,400 r/min is the cage/rib mechanical ceiling for T7FC070, oil 3,200 r/min is available with circulating oil — a 800 r/min margin at this size. Open 4T bearings need application seals; without them the grease at the cone rib of T7FC070 washes out and the rib/roller-end contact smears on the first wet or dusty shift.
Typical equipment & failure modes
Common applications
- large conveyor and bucket-elevator pulleys
- mineral-processing feeder and crusher auxiliaries
- marine winch and deck-machinery shafts
- paper-machine press-section rolls
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
Selection pitfalls — read before you substitute
- Mount the 70 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 2620 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The large-size ISO 355 tapered-roller family at 70 mm bore (140×39 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 3,200 r/min oil ceiling.
- Never fit the 70 mm cone by hammering the 140 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Grease packs must leave free volume in the 39 mm-wide set; over-greasing a paired bearing churning at the 3,200 r/min oil-band speed raises temperature and destroys the preload setting.
- The 35.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for T7FC070 or the ring will bottom out on the radius instead of the shoulder face.
- The 191/231 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for T7FC070 (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 T7FC070?
T7FC070 is a metric 4T tapered roller bearing to ISO 355: 70 mm bore, 140 mm outside diameter and 39 mm assembled width T (2.756 × 5.512 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 231 kN (2203E prints no Pu for this size), grease limiting speed 2,400 r/min, oil speed 3,200 r/min, mass about 2620 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on T7FC070?
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 (T7FC070); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the T7FC070 designation encode the 70 mm bore and what is 7FC?
trailing dimension block 070 prints the 70 mm bore directly for this large-size T-code. The 140 mm OD and 39 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 T7FC070 list two speeds, 2,400 and 3,200 r/min?
The lower figure, 2,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates T7FC070 at 3,200 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on T7FC070 mean?
The T2/T4/T7-style code is NTN's large-size tapered roller designation within ISO 355; it identifies the dimension series and 70 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.