JHM807045-JHM807012 bearing: complete specifications & equivalents
The JHM807045-JHM807012 is a ANSI ABMA 19.2 radial bearing sized 50 x 105 x 37 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 50 mm |
| Outer diameter D | 105 mm |
| Width B | 37 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 153 kN |
| Basic static load rating C0 | 189 kN |
| Limiting speed (mechanical) | 3600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1520 g |
| Manufacturer designation | NTN 4T-JHM807045/JHM807012 |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 4.134 in |
| Width B | 1.457 in |
| ISO bore code | 45 |
| Radial section height (D−d)/2 | 27.5 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) | 63 of 148 |
| Bore above smallest 4t-inch-series size | 37.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JHM807045 | 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 JHM807045-JHM807012 model number is decoded
The NTN 2203E inch table prints 4T-JHM807045/JHM807012 at 50 mm bore (1.969 in), 105 mm cup OD and 37 mm assembled T, with a grease limiting speed of 3,600 r/min and an oil ceiling of 4,800 r/min. Reading the designation: 4T-JHM807045/JHM807012 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. The 27.5 mm radial section over the 50 mm bore positions the contact line of the pair; abutment shoulders and spacers are dimensioned from that geometry, not from the bore alone. Cup-side note for JHM807012: within the JHM heavy metric-envelope family tables the JHM807045 cone is listed against several cup options, and it is the cup that fixes the 105 mm OD and the 37 mm assembled width — quote the full JHM807045/JHM807012 pair, never the cone alone. Back-to-back (O) and face-to-face (X) arrangements of two 4T-JHM807045/JHM807012 sets react differently to shaft bending; choose the orientation for the moment load before locking shoulder geometry.
Typical equipment & failure modes
Common applications
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 50 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-JHM807045/JHM807012.
- The J-prefixed JHM807045 code belongs to a metric-envelope inch family: its 50 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.
- Fit selection follows the rotating ring: a rotating cone on a 50 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- Quote the full JHM807045/JHM807012 pair at ordering: the JHM807045 cone also ships against sibling cups, and a cup from another reference changes the 37 mm assembled width and the rating.
- Fit selection follows the rotating ring: a rotating cone on a 50 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- The 153/189 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JHM807045/JHM807012; 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-JHM807045/JHM807012?
4T-JHM807045/JHM807012 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 50 mm bore (1.969 in), 105 mm outside diameter and 37 mm assembled width T (4.134 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 153 kN, C0 189 kN, grease limiting speed 3,600 r/min, oil speed 4,800 r/min, mass about 1520 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JHM807045/JHM807012 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JHM807045 cone or the JHM807012 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 153/189 kN ratings change with the cup.
What is the difference between 4T-JHM807045/JHM807012 and a metric ISO 355 tapered bearing?
4T-JHM807045/JHM807012 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 50×105×37 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-JHM807045/JHM807012 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 JHM807045/JHM807012 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JHM807045/JHM807012 list two speeds, 3,600 and 4,800 r/min?
The lower figure, 3,600 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-JHM807045/JHM807012 at 4,800 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.