850-832 bearing: complete specifications & equivalents
The 850-832 is a ANSI ABMA 19.2 radial bearing sized 88.9 x 168.275 x 53.975 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 88.9 mm |
| Outer diameter D | 168.275 mm |
| Width B | 53.975 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 375 kN |
| Basic static load rating C0 | 460 kN |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5090 g |
| Manufacturer designation | NTN 4T-850/832 |
| 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 | 3.5 in |
|---|---|
| Outer diameter D | 6.625 in |
| Width B | 2.125 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 39.7 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) | 106 of 148 |
| Bore above smallest 4t-inch-series size | 76.2 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 850 | 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 850-832 model number is decoded
4T-850/832 is the NTN 4T catalogue entry for a 88.9×168.275×53.975 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Cone and cup of 4T-850/832 are separately stocked parts: a worn 832 cup can be replaced against the existing 850 cone, provided the new cup carries the identical reference — pairing across references changes the 53.975 mm assembled width and the rating. The 4.2 kN of dynamic capacity per millimetre of bore summarises the 375 kN rating over the 88.9 mm bore — sanity-check any interchange candidate against this ratio and the 53.975 mm T. Cup-side note for 832: within the pure-numeric inch family tables the 850 cone is listed against several cup options, and it is the cup that fixes the 168.275 mm OD and the 53.975 mm assembled width — quote the full 850/832 pair, never the cone alone. Mount the 88.9 mm cone with an induction heater (max 120 °C) and press the 168.275 mm cup with a sleeve; driving either ring through the rollers brinells the raceways.
Typical equipment & failure modes
Common applications
- crusher and screening-plant eccentric shafts
- heavy truck and bus drive-axle differentials
- plant gearboxes on inch-dimensioned shaft lines
- large conveyor head pulleys in bulk-handling plant
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- false brinelling on a stationary pair exposed to vibration during transport or standby
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Mount the 88.9 mm cone by induction heating (max 120 °C) and the 168.275 mm cup with a press sleeve; at 5090 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 88.9 mm bore (168.275×53.975 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 850/832 reference at purchase.
- Inch and metric bores collide on paper — 88.9 mm is 3.5 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- Fit selection follows the rotating ring: a rotating cone on a 88.9 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- ABMA makes the 88.9×168.275 mm envelope interchangeable, not the ratings: NTN prints 375/460 kN for this execution and another make of the same number can differ in roller complement.
- The 375/460 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-850/832; 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-850/832?
4T-850/832 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 88.9 mm bore (3.5 in), 168.275 mm outside diameter and 53.975 mm assembled width T (6.625 × 2.125 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 375 kN, C0 460 kN, grease limiting speed 2,200 r/min, oil speed 3,000 r/min, mass about 5090 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-850/832 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 850 cone or the 832 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 375/460 kN ratings change with the cup.
What is the difference between 4T-850/832 and a metric ISO 355 tapered bearing?
4T-850/832 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 88.9×168.275×53.975 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-850/832 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 850/832 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-850/832 list two speeds, 2,200 and 3,000 r/min?
The lower figure, 2,200 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-850/832 at 3,000 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.