LM522546-LM522510 bearing: complete specifications & equivalents
The LM522546-LM522510 is a ANSI ABMA 19.2 radial bearing sized 107.95 x 159.987 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 | 107.95 mm |
| Outer diameter D | 159.987 mm |
| Width B | 34.925 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 186 kN |
| Basic static load rating C0 | 320 kN |
| Limiting speed (mechanical) | 2100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2370 g |
| Manufacturer designation | NTN 4T-LM522546/LM522510 |
| 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 | 4.25 in |
|---|---|
| Outer diameter D | 6.299 in |
| Width B | 1.375 in |
| ISO bore code | 46 |
| Radial section height (D−d)/2 | 26 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) | 121 of 148 |
| Bore above smallest 4t-inch-series size | 95.25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM522546 | 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 LM522546-LM522510 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-LM522546/LM522510 denotes the light-medium LM family of NTN inch tapered roller bearings — cone LM522546 and cup LM522510 delivered as a matched, separable pair of 107.95 mm bore and 159.987 mm outside diameter. Reading the designation: 4T-LM522546/LM522510 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 light-medium LM family lettering ties the pair to its boundary plan. Selection: C 186 kN against C0 320 kN gives a C0/C ratio of 1.72 for the 107.95 mm bore; the pair is counted as one adjusted unit when checking L10 at the equivalent combined load. The printed 186/320 kN ratings belong to the assembled LM522546+LM522510 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-LM522546/LM522510 pair — initial seating of the ring faces relaxes the setting slightly.
Typical equipment & failure modes
Common applications
- plant gearboxes on inch-dimensioned shaft lines
- large conveyor head pulleys in bulk-handling plant
- paper-machine and calender roll supports
- off-highway and forestry machine axles
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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
- Mount the 107.95 mm cone by induction heating (max 120 °C) and the 159.987 mm cup with a press sleeve; at 2370 g a cocked ring brinells the raceway directly.
- The light-medium LM family at 107.95 mm bore (159.987×34.925 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full LM522546/LM522510 reference at purchase.
- Inch and metric bores collide on paper — 107.95 mm is 4.25 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- Replacing one half of an adjusted pair without resetting end play negates the 34.925 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Fit selection follows the rotating ring: a rotating cone on a 107.95 mm shaft takes a m6/n6 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- The 186/320 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-LM522546/LM522510; 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-LM522546/LM522510?
4T-LM522546/LM522510 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 107.95 mm bore (4.25 in), 159.987 mm outside diameter and 34.925 mm assembled width T (6.299 × 1.375 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 186 kN, C0 320 kN, grease limiting speed 2,100 r/min, oil speed 2,800 r/min, mass about 2370 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-LM522546/LM522510 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the LM522546 cone or the LM522510 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 186/320 kN ratings change with the cup.
What is the difference between 4T-LM522546/LM522510 and a metric ISO 355 tapered bearing?
4T-LM522546/LM522510 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 107.95×159.987×34.925 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-LM522546/LM522510 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 LM522546/LM522510 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-LM522546/LM522510 list two speeds, 2,100 and 2,800 r/min?
The lower figure, 2,100 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-LM522546/LM522510 at 2,800 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.