HM801346-HM801310 bearing: complete specifications & equivalents
The HM801346-HM801310 is a ANSI ABMA 19.2 radial bearing sized 38.1 x 82.55 x 29.37 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 38.1 mm |
| Outer diameter D | 82.55 mm |
| Width B | 29.37 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 96.5 kN |
| Basic static load rating C0 | 117 kN |
| Limiting speed (mechanical) | 4700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 767 g |
| Manufacturer designation | NTN 4T-HM801346/HM801310 |
| 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 | 1.5 in |
|---|---|
| Outer diameter D | 3.25 in |
| Width B | 1.156 in |
| ISO bore code | 46 |
| Radial section height (D−d)/2 | 22.2 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) | 42 of 148 |
| Bore above smallest 4t-inch-series size | 25.400000000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM801346-310 | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
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 HM801346-HM801310 model number is decoded
NTN supplies this 1.5 in (38.1 mm) shaft position as 4T-HM801346/HM801310: cone HM801346, cup HM801310, profiled rollers and a pressed-steel cage, rated 96.5 kN basic dynamic and 117 kN static. Cone and cup of 4T-HM801346/HM801310 are separately stocked parts: a worn HM801310 cup can be replaced against the existing HM801346 cone, provided the new cup carries the identical reference — pairing across references changes the 29.37 mm assembled width and the rating. Grease relubrication at the 4,700 r/min limiting speed targets the cone-rib contact; sustaining 6,200 r/min needs an oil supply directed at the large roller ends. The printed 96.5/117 kN ratings belong to the assembled HM801346+HM801310 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-HM801346/HM801310 pair — initial seating of the ring faces relaxes the setting slightly.
Typical equipment & failure modes
Common applications
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 38.1 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-HM801346/HM801310.
- The heavy-medium HM family is proportioned for a high thrust share; swapping to a lighter LM or pure-numeric series at the same 38.1 mm bore cuts axial capacity even when the envelope fits — re-verify the load split before downgrading.
- Never drive the 82.55 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.
- ABMA makes the 38.1×82.55 mm envelope interchangeable, not the ratings: NTN prints 96.5/117 kN for this execution and another make of the same number can differ in roller complement.
- An unloaded 4T-HM801346/HM801310 near 4,700 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- The 96.5/117 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-HM801346/HM801310; 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-HM801346/HM801310?
4T-HM801346/HM801310 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 38.1 mm bore (1.5 in), 82.55 mm outside diameter and 29.37 mm assembled width T (3.25 × 1.156 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 96.5 kN, C0 117 kN, grease limiting speed 4,700 r/min, oil speed 6,200 r/min, mass about 767 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-HM801346/HM801310 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the HM801346 cone or the HM801310 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 96.5/117 kN ratings change with the cup.
What is the difference between 4T-HM801346/HM801310 and a metric ISO 355 tapered bearing?
4T-HM801346/HM801310 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 38.1×82.55×29.37 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-HM801346/HM801310 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 HM801346/HM801310 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-HM801346/HM801310 list two speeds, 4,700 and 6,200 r/min?
The lower figure, 4,700 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-HM801346/HM801310 at 6,200 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.