67388-67322-NTN bearing: complete specifications & equivalents
The 67388-67322-NTN is a ANSI ABMA 19.2 radial bearing sized 127 x 196.85 x 46.038 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 127 mm |
| Outer diameter D | 196.85 mm |
| Width B | 46.038 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 340 kN |
| Basic static load rating C0 | 550 kN |
| Limiting speed (mechanical) | 1700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5100 g |
| Manufacturer designation | NTN 4T-67388/67322 |
| 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 | 5 in |
|---|---|
| Outer diameter D | 7.75 in |
| Width B | 1.813 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 34.9 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) | 133 of 148 |
| Bore above smallest 4t-inch-series size | 114.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 67388-67322 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 127×196.85×46.038 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
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 67388-67322-NTN model number is decoded
The NTN 2203E inch table prints 4T-67388/67322 at 127 mm bore (5 in), 196.85 mm cup OD and 46.038 mm assembled T, with a grease limiting speed of 1,700 r/min and an oil ceiling of 2,200 r/min. Reading the designation: 4T-67388/67322 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 pure-numeric inch family lettering ties the pair to its boundary plan. Grease relubrication at the 1,700 r/min limiting speed targets the cone-rib contact; sustaining 2,200 r/min needs an oil supply directed at the large roller ends. Housing fitment sequence for 4T-67388/67322: press the 67322 cup square into the 196.85 mm seat first, then bring the 67388 cone (on its 127 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. A single-row tapered bearing reacts thrust in one direction only; 4T-67388/67322 is adjusted against a second bearing so the shaft is located in both directions.
Typical equipment & failure modes
Common applications
- heavy press and forging-machine drive shafts
- port-crane travel and hoist gearboxes
- cement-plant mill and kiln drive trains
- large shredder and recycler main 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 damage from a mounting blow transmitted through the roller complement
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- At 127 mm bore the 4T-67388/67322 set is adjusted with hydraulic nuts or measured shims on mill and crane positions; manual torque methods cannot control preload at the 340 kN C level.
- The pure-numeric inch family at 127 mm bore (196.85×46.038 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 67388/67322 reference at purchase.
- ABMA makes the 127×196.85 mm envelope interchangeable, not the ratings: NTN prints 340/550 kN for this execution and another make of the same number can differ in roller complement.
- Grease packs must leave free volume inside the 46.038 mm-wide set; over-greasing a pair churning near the oil-band speed of 2,200 r/min raises temperature and destroys the setting.
- Never drive the 196.85 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 340/550 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-67388/67322; 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-67388/67322?
4T-67388/67322 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 127 mm bore (5 in), 196.85 mm outside diameter and 46.038 mm assembled width T (7.75 × 1.813 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 340 kN, C0 550 kN, grease limiting speed 1,700 r/min, oil speed 2,200 r/min, mass about 5100 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-67388/67322 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 67388 cone or the 67322 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 340/550 kN ratings change with the cup.
What is the difference between 4T-67388/67322 and a metric ISO 355 tapered bearing?
4T-67388/67322 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 127×196.85×46.038 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-67388/67322 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 67388/67322 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-67388/67322 list two speeds, 1,700 and 2,200 r/min?
The lower figure, 1,700 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-67388/67322 at 2,200 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.