557S-552A bearing: complete specifications & equivalents
The 557S-552A is a ANSI ABMA 19.2 radial bearing sized 53.975 x 123.825 x 38.1 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 53.975 mm |
| Outer diameter D | 123.825 mm |
| Width B | 38.1 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 175 kN |
| Basic static load rating C0 | 216 kN |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2250 g |
| Manufacturer designation | NTN 4T-557S/552A |
| 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 | 2.125 in |
|---|---|
| Outer diameter D | 4.875 in |
| Width B | 1.5 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 34.9 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) | 67 of 148 |
| Bore above smallest 4t-inch-series size | 41.275000000000006 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 557S | 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 557S-552A model number is decoded
4T-557S/552A is the NTN 4T catalogue entry for a 53.975×123.825×38.1 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Letter prefixes inherited from the inch convention mark the load family: LM reads as light-medium, HM as heavy-medium, LL as extra-light, J-prefixed codes as metric-envelope families — 557S sits in the pure-numeric inch family. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 38.1 mm T of each 4T-557S/552A enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. The printed 175/216 kN ratings belong to the assembled 557S+552A pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. Fillet radii must clear the chamfers of the 557S cone and 552A cup; undercut shoulders seat the rings fully instead of bridging on a radius.
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
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- false brinelling on a stationary pair exposed to vibration during transport or standby
- cage fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 53.975 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-557S/552A.
- The pure-numeric inch family at 53.975 mm bore (123.825×38.1 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 557S/552A reference at purchase.
- Shaft and housing fillets must clear the ring chamfers of 557S and 552A; use undercut shoulders so the rings seat on the face, not on a radius.
- Inch and metric bores collide on paper — 53.975 mm is 2.125 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- Inch and metric bores collide on paper — 53.975 mm is 2.125 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- The 175/216 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-557S/552A; 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-557S/552A?
4T-557S/552A is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 53.975 mm bore (2.125 in), 123.825 mm outside diameter and 38.1 mm assembled width T (4.875 × 1.5 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 175 kN, C0 216 kN, grease limiting speed 3,000 r/min, oil speed 4,100 r/min, mass about 2250 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-557S/552A interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 557S cone or the 552A 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 175/216 kN ratings change with the cup.
What is the difference between 4T-557S/552A and a metric ISO 355 tapered bearing?
4T-557S/552A 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 53.975×123.825×38.1 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-557S/552A 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 557S/552A references; the 4T spelling is retained among this page's search aliases.
Why does 4T-557S/552A list two speeds, 3,000 and 4,100 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-557S/552A at 4,100 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.