JHM318448-JHM318410 bearing: complete specifications & equivalents
The JHM318448-JHM318410 is a ANSI ABMA 19.2 radial bearing sized 90 x 155 x 44 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 90 mm |
| Outer diameter D | 155 mm |
| Width B | 44 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 299 kN |
| Basic static load rating C0 | 385 kN |
| Limiting speed (mechanical) | 2300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3330 g |
| Manufacturer designation | NTN 4T-JHM318448/JHM318410 |
| 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 | 3.543 in |
|---|---|
| Outer diameter D | 6.102 in |
| Width B | 1.732 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 32.5 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) | 108 of 148 |
| Bore above smallest 4t-inch-series size | 77.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JHM318448 | 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 JHM318448-JHM318410 model number is decoded
NTN supplies this 3.543 in (90 mm) shaft position as 4T-JHM318448/JHM318410: cone JHM318448, cup JHM318410, profiled rollers and a pressed-steel cage, rated 299 kN basic dynamic and 385 kN static. Reading the designation: 4T-JHM318448/JHM318410 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 JHM heavy metric-envelope family lettering ties the pair to its boundary plan. Imperial cross-check for the drawing: 90×155×44 mm converts to 3.543 × 6.102 × 1.732 in; the ABMA envelope swaps with like-numbered inch parts but the 299/385 kN ratings are NTN-specific. The printed 299/385 kN ratings belong to the assembled JHM318448+JHM318410 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. Minimum load matters at speed: an unloaded 4T-JHM318448/JHM318410 run near 2,300 r/min lets the rollers skid; lightly spring-preload high-speed pair arrangements.
Typical equipment & failure modes
Common applications
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
- crusher and screening-plant eccentric shafts
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- 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 fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- indentation of the raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- Mount the 90 mm cone by induction heating (max 120 °C) and the 155 mm cup with a press sleeve; at 3330 g a cocked ring brinells the raceway directly.
- The J-prefixed JHM318448 code belongs to a metric-envelope inch family: its 90 mm bore is a round metric figure, yet the part still follows ABMA cone/cup numbering — do not substitute an ISO 355 metric 302/322 bearing of the same bore without checking OD, T and contact angle.
- Open 4T-JHM318448/JHM318410 sets have no seals: a hub or gearbox needs external sealing or the 2,300 r/min grease figure is meaningless once water reaches the cone rib.
- Do not confuse T (44 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Replacing one half of an adjusted pair without resetting end play negates the 44 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 299/385 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JHM318448/JHM318410; 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-JHM318448/JHM318410?
4T-JHM318448/JHM318410 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 90 mm bore (3.543 in), 155 mm outside diameter and 44 mm assembled width T (6.102 × 1.732 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 299 kN, C0 385 kN, grease limiting speed 2,300 r/min, oil speed 3,100 r/min, mass about 3330 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JHM318448/JHM318410 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JHM318448 cone or the JHM318410 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 299/385 kN ratings change with the cup.
What is the difference between 4T-JHM318448/JHM318410 and a metric ISO 355 tapered bearing?
4T-JHM318448/JHM318410 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 90×155×44 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-JHM318448/JHM318410 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 JHM318448/JHM318410 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JHM318448/JHM318410 list two speeds, 2,300 and 3,100 r/min?
The lower figure, 2,300 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-JHM318448/JHM318410 at 3,100 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.