26884-26822 bearing: complete specifications & equivalents
The 26884-26822 is a ANSI ABMA 19.2 radial bearing sized 42.875 x 79.375 x 23.812 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 42.875 mm |
| Outer diameter D | 79.375 mm |
| Width B | 23.812 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 85 kN |
| Basic static load rating C0 | 97.5 kN |
| Limiting speed (mechanical) | 4800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 511 g |
| Manufacturer designation | NTN 4T-26884/26822 |
| 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 | 1.688 in |
|---|---|
| Outer diameter D | 3.125 in |
| Width B | 0.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 18.3 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) | 50 of 148 |
| Bore above smallest 4t-inch-series size | 30.175 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 26884 | 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 26884-26822 model number is decoded
NTN supplies this 1.688 in (42.875 mm) shaft position as 4T-26884/26822: cone 26884, cup 26822, profiled rollers and a pressed-steel cage, rated 85 kN basic dynamic and 97.5 kN static. Reading the designation: 4T-26884/26822 follows the ABMA inch convention — the number before the slash is the cone (inner ring with roller set and cage), the number after the slash is the cup (outer ring), and the pure-numeric inch family lettering ties the pair to its boundary plan. The 2.0 kN of dynamic capacity per millimetre of bore summarises the 85 kN rating over the 42.875 mm bore — sanity-check any interchange candidate against this ratio and the 23.812 mm T. Housing fitment sequence for 4T-26884/26822: press the 26822 cup square into the 79.375 mm seat first, then bring the 26884 cone (on its 42.875 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. With a rotating shaft a k5/m5 cone seat and an easy-push cup seat are typical practice for 4T-26884/26822; reverse the fit logic when the cup rotates.
Typical equipment & failure modes
Common applications
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- edge loading when shaft deflection exceeds the few arc-minutes an adjusted pair tolerates
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 42.875 mm class are adjusted in pairs; verify end play against the axle or gearbox drawing and re-torque after bedding-in instead of trusting the first setting on 4T-26884/26822.
- The pure-numeric inch family at 42.875 mm bore (79.375×23.812 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 26884/26822 reference at purchase.
- Do not confuse T (23.812 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- ABMA makes the 42.875×79.375 mm envelope interchangeable, not the ratings: NTN prints 85/97.5 kN for this execution and another make of the same number can differ in roller complement.
- Replacing one half of an adjusted pair without resetting end play negates the 23.812 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 85/97.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-26884/26822; 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-26884/26822?
4T-26884/26822 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 42.875 mm bore (1.688 in), 79.375 mm outside diameter and 23.812 mm assembled width T (3.125 × 0.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 85 kN, C0 97.5 kN, grease limiting speed 4,800 r/min, oil speed 6,400 r/min, mass about 511 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-26884/26822 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 26884 cone or the 26822 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 85/97.5 kN ratings change with the cup.
What is the difference between 4T-26884/26822 and a metric ISO 355 tapered bearing?
4T-26884/26822 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 42.875×79.375×23.812 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-26884/26822 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 26884/26822 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-26884/26822 list two speeds, 4,800 and 6,400 r/min?
The lower figure, 4,800 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 4T-26884/26822 at 6,400 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.