529-522 bearing: complete specifications & equivalents
The 529-522 is a ANSI ABMA 19.2 radial bearing sized 50.8 x 101.6 x 34.925 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 | 101.6 mm |
| Width B | 34.925 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 150 kN |
| Basic static load rating C0 | 165 kN |
| Limiting speed (mechanical) | 3800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1230 g |
| Manufacturer designation | NTN 4T-529/522 |
| 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 in |
| Width B | 1.375 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25.4 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 |
|---|---|---|---|
| 529 | 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 529-522 model number is decoded
For an inch shaft of 50.8 mm carrying combined radial and thrust load, NTN lists 4T-529/522, a single-row 4T tapered roller set of 150 kN C and 165 kN C0 inside the 101.6 mm OD cup. Cone and cup of 4T-529/522 are separately stocked parts: a worn 522 cup can be replaced against the existing 529 cone, provided the new cup carries the identical reference — pairing across references changes the 34.925 mm assembled width and the rating. Speed planning uses both catalogue columns: grease 3,800 r/min is the mechanical ceiling for 4T-529/522, oil 5,000 r/min with circulating oil — a 1,200 r/min margin at this size. The printed 150/165 kN ratings belong to the assembled 529+522 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. After bedding-in, re-check the end play of the adjusted 4T-529/522 pair — initial seating of the ring faces relaxes the setting slightly.
Typical equipment & failure modes
Common applications
- pump and blower drive shafts with combined load
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cage damage from a mounting blow transmitted through the roller complement
- water-induced pitting when the open bearing sees washdown without external seals
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-529/522.
- The pure-numeric inch family at 50.8 mm bore (101.6×34.925 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 529/522 reference at purchase.
- Shaft and housing fillets must clear the ring chamfers of 529 and 522; use undercut shoulders so the rings seat on the face, not on a radius.
- An unloaded 4T-529/522 near 3,800 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- Never drive the 101.6 mm cup home through the rollers: fitting force goes through the ring faces only, or brinell marks release as noise within the first running hours.
- The 150/165 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-529/522; 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-529/522?
4T-529/522 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 50.8 mm bore (2 in), 101.6 mm outside diameter and 34.925 mm assembled width T (4 × 1.375 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 150 kN, C0 165 kN, grease limiting speed 3,800 r/min, oil speed 5,000 r/min, mass about 1230 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-529/522 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 529 cone or the 522 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 150/165 kN ratings change with the cup.
What is the difference between 4T-529/522 and a metric ISO 355 tapered bearing?
4T-529/522 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 50.8×101.6×34.925 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-529/522 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 529/522 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-529/522 list two speeds, 3,800 and 5,000 r/min?
The lower figure, 3,800 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-529/522 at 5,000 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.