66200-66462 bearing: complete specifications & equivalents
The 66200-66462 is a ANSI ABMA 19.2 radial bearing sized 50.8 x 117.475 x 33.338 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 50.8 mm |
| Outer diameter D | 117.475 mm |
| Width B | 33.338 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 144 kN |
| Basic static load rating C0 | 153 kN |
| Limiting speed (mechanical) | 3300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1680 g |
| Manufacturer designation | NTN 4T-66200/66462 |
| 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 in |
|---|---|
| Outer diameter D | 4.625 in |
| Width B | 1.313 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 33.3 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) | 64 of 148 |
| Bore above smallest 4t-inch-series size | 38.099999999999994 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 66200 | 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 66200-66462 model number is decoded
4T-66200/66462 is the NTN 4T catalogue entry for a 50.8×117.475×33.338 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 66200 identifies the cone of 50.8 mm (2 in) bore by catalogue lookup, and 66462 fixes the 117.475 mm OD. The 33.3 mm radial section over the 50.8 mm bore positions the contact line of the pair; abutment shoulders and spacers are dimensioned from that geometry, not from the bore alone. Housing fitment sequence for 4T-66200/66462: press the 66462 cup square into the 117.475 mm seat first, then bring the 66200 cone (on its 50.8 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. After bedding-in, re-check the end play of the adjusted 4T-66200/66462 pair — initial seating of the ring faces relaxes the setting slightly.
Typical equipment & failure modes
Common applications
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
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
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 50.8 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-66200/66462.
- The pure-numeric inch family at 50.8 mm bore (117.475×33.338 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 66200/66462 reference at purchase.
- Fit selection follows the rotating ring: a rotating cone on a 50.8 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 50.8×117.475 mm envelope interchangeable, not the ratings: NTN prints 144/153 kN for this execution and another make of the same number can differ in roller complement.
- An unloaded 4T-66200/66462 near 3,300 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- The 144/153 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-66200/66462; 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-66200/66462?
4T-66200/66462 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 50.8 mm bore (2 in), 117.475 mm outside diameter and 33.338 mm assembled width T (4.625 × 1.313 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 144 kN, C0 153 kN, grease limiting speed 3,300 r/min, oil speed 4,400 r/min, mass about 1680 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-66200/66462 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 66200 cone or the 66462 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 144/153 kN ratings change with the cup.
What is the difference between 4T-66200/66462 and a metric ISO 355 tapered bearing?
4T-66200/66462 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 50.8×117.475×33.338 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-66200/66462 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 66200/66462 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-66200/66462 list two speeds, 3,300 and 4,400 r/min?
The lower figure, 3,300 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-66200/66462 at 4,400 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.