33281-33462-NTN bearing: complete specifications & equivalents
The 33281-33462-NTN is a ANSI ABMA 19.2 radial bearing sized 71.438 x 117.475 x 30.162 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 71.438 mm |
| Outer diameter D | 117.475 mm |
| Width B | 30.162 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 129 kN |
| Basic static load rating C0 | 175 kN |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1240 g |
| Manufacturer designation | NTN 4T-33281/33462 |
| 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 | 2.813 in |
|---|---|
| Outer diameter D | 4.625 in |
| Width B | 1.187 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 23 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) | 89 of 148 |
| Bore above smallest 4t-inch-series size | 58.738 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33281-33462 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 71.438×117.475×30.162 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
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 33281-33462-NTN model number is decoded
For an inch shaft of 71.438 mm carrying combined radial and thrust load, NTN lists 4T-33281/33462, a single-row 4T tapered roller set of 129 kN C and 175 kN C0 inside the 117.475 mm OD cup. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 33281 identifies the cone of 71.438 mm (2.813 in) bore by catalogue lookup, and 33462 fixes the 117.475 mm OD. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 30.162 mm T of each 4T-33281/33462 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. Cup-side note for 33462: within the pure-numeric inch family tables the 33281 cone is listed against several cup options, and it is the cup that fixes the 117.475 mm OD and the 30.162 mm assembled width — quote the full 33281/33462 pair, never the cone alone. NTN grades inch 4T bearings as open bearings without integral seals; at 71.438 mm bore the application supplies sealing and the grease fill or oil feed.
Typical equipment & failure modes
Common applications
- heavy truck and bus drive-axle differentials
- plant gearboxes on inch-dimensioned shaft lines
- large conveyor head pulleys in bulk-handling plant
- paper-machine and calender roll supports
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
- cage damage from a mounting blow transmitted through the roller complement
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Mount the 71.438 mm cone by induction heating (max 120 °C) and the 117.475 mm cup with a press sleeve; at 1240 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 71.438 mm bore (117.475×30.162 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 33281/33462 reference at purchase.
- Shaft and housing fillets must clear the ring chamfers of 33281 and 33462; use undercut shoulders so the rings seat on the face, not on a radius.
- Inch and metric bores collide on paper — 71.438 mm is 2.813 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- Do not confuse T (30.162 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- The 129/175 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-33281/33462; 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-33281/33462?
4T-33281/33462 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 71.438 mm bore (2.813 in), 117.475 mm outside diameter and 30.162 mm assembled width T (4.625 × 1.187 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 129 kN, C0 175 kN, grease limiting speed 3,000 r/min, oil speed 4,000 r/min, mass about 1240 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-33281/33462 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 33281 cone or the 33462 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 129/175 kN ratings change with the cup.
What is the difference between 4T-33281/33462 and a metric ISO 355 tapered bearing?
4T-33281/33462 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 71.438×117.475×30.162 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-33281/33462 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 33281/33462 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-33281/33462 list two speeds, 3,000 and 4,000 r/min?
The lower figure, 3,000 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-33281/33462 at 4,000 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.