51407 bearing: complete specifications & equivalents
The 51407 is a ISO 104 radial bearing sized 35 x 80 x 32 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 35 mm |
| Outer diameter D | 80 mm |
| Width B | 32 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 87 kN |
| Basic static load rating C0 | 155 kN |
| Fatigue load limit Pu | 7 kN |
| Limiting speed (mechanical) | 1900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 759 g |
| Manufacturer designation | NTN 51407 |
| Standard | ISO 104 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); 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 & 51400-series range
| Bore d | 1.378 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 1.26 in |
| ISO bore code | 07 |
| Radial section height (D−d)/2 | 22.5 mm |
| Smallest bore in 51400-series | 25 mm |
| Largest outer diameter in 51400-series | 300 mm |
| Width range across 51400-series | 24–120 mm |
| Bore position in 51400-series (smallest first) | 3 of 20 |
| Bore above smallest 51400-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 51407-SKF | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 35×80×32 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 51407 model number is decoded
NTN 51407 belongs to the extra-heavy 51400 thrust family of single-direction thrust ball bearings: 35 / 80 / 32 mm (shaft bore / OD / height). Two fields make up the code — 514 is the dimension series (extra-heavy 51400 thrust family) and 07 encodes the 35 mm bore (bore code x 5). Because the contact points run at 90 deg to the shaft, none of the rating is available for radial load — not even incidentally. Against a thrust roller bearing of the same 35 mm bore, this bearing is cheaper, quieter and happier at speed, but carries far less load per mm of section. After assembly, rotate under light load and check torque and temperature rise — a thrust ball bearing mounted with the washers swapped runs, but fails fast.
Typical equipment & failure modes
Common applications
- press and punch-machine thrust seats
- conveyor vertical-drive thrust positions
- vertical motor and pump thrust shoes
- machine-tool tailstock and steady-rest screws
Known failure patterns
- cage pocket wear and ball skid polish after long running below the minimum axial load, the balls sliding instead of rolling on the washers
- fretting between shaft washer and shaft when the seat is cut loose — the washer creeps, the centre line shifts and the balls start running off-track
- rapid flaking after radial load was allowed onto the bearing — a single-direction thrust ball bearing carries axial load only
- cage breakage after repeated shock reversal banged the ball set against the pocket bridges
- cage breakage after repeated shock reversal banged the ball set against the pocket bridges
Selection pitfalls — read before you substitute
- In this size class the frequent miss is washer identification: keep the catalogued shaft/housing washer pairing of the 35 mm size together from unpacking to assembly.
- The 514 extra-heavy section is the top of the thrust-ball plan at this bore; beyond it the catalogue moves to spherical roller thrust bearings.
- Below the minimum axial load the balls skid; the catalogue Ca of 87 kN never saves a bearing that is running too lightly loaded at 1,900 r/min.
- Swapping the shaft and housing washers is an easy assembly error on the 35 mm size — the bores differ only slightly, but the wrong pairing walks off-centre under load.
- Single-direction means exactly that: thrust on 51407 in the wrong direction separates the washers and drops the ball set — if reversal is possible even during coast-down, engineer against it.
- The Ca 87/C0a 155 kN ratings and 7 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 51407; raceway geometry legitimately differs between manufacturers, so re-verify ratings and washer identification before substituting another make.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 51407?
51407 is a single-direction thrust ball bearing to ISO 104: 35 mm shaft-washer bore, 80 mm outside diameter, 32 mm stack height (1.378 x 3.15 x 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 87 kN, C0a 155 kN and a 7 kN fatigue load limit Pu; the grease limiting speed is 1,900 r/min and the oil rating 2,800 r/min; mass about 759 g.
How is the 51407 designation structured?
514 is the dimension series (extra-heavy 51400 thrust family); 07 encodes the 35 mm bore (bore code x 5). The 80 mm OD and 32 mm height follow the ISO 104 boundary plan for that series.
Can 51407 carry radial load or reversing thrust?
No. The raceways contact the balls at 90 deg to the shaft, so the rating is purely axial and single-direction. Radial load must be carried by a separate radial bearing, and reversing thrust needs a second thrust bearing or a double-direction execution.
Why does NTN specify a minimum axial load for 51407?
At the 1,900 r/min class speed, centrifugal and gyroscopic effects make an under-loaded ball set skid and smear instead of roll. The catalogue minimum-load formula gives the axial preload — from the machine weight, springs or a dead-weight — that keeps the contact rolling.
What should be checked before substituting another make for 51407?
The 35/80/32 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 87 kN / C0a 155 kN, the speed figures and the shaft/housing washer identification against the donor catalogue.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.