51107 bearing: complete specifications & equivalents
The 51107 is a ISO 104 radial bearing sized 35 x 52 x 12 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 | 52 mm |
| Width B | 12 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 20.4 kN |
| Basic static load rating C0 | 44.5 kN |
| Fatigue load limit Pu | 2.02 kN |
| Limiting speed (mechanical) | 3900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 85 g |
| Manufacturer designation | NTN 51107 |
| 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 & 51100-series range
| Bore d | 1.378 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.472 in |
| ISO bore code | 07 |
| Radial section height (D−d)/2 | 8.5 mm |
| Smallest bore in 51100-series | 10 mm |
| Largest outer diameter in 51100-series | 640 mm |
| Width range across 51100-series | 9–85 mm |
| Bore position in 51100-series (smallest first) | 8 of 46 |
| Bore above smallest 51100-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 51107-SKF | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 35×52×12 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 51107 model number is decoded
The light-section 51100 thrust family entry 51107 stacks a shaft washer, ball-and-cage set and housing washer into 12 mm of height over a 35 mm bore. Two fields make up the code — 511 is the dimension series (light-section 51100 thrust family) and 07 encodes the 35 mm bore (bore code x 5). At 12 mm of height the stack is compact for the 35 mm bore class, trading section height for the light-section load level. Selection starts from the load direction: if thrust ever reverses, plan a second thrust bearing (or a double-direction execution) rather than relying on the unloaded raceway. Keep the support faces square: a housing face out of perpendicular by a few hundredths over the 52 mm OD already tilts the raceway and concentrates the 44.5 kN static capacity on a few balls.
Typical equipment & failure modes
Common applications
- winch and capstan vertical shafts
- press and punch-machine thrust seats
- conveyor vertical-drive thrust positions
- vertical motor and pump thrust shoes
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
- housing-washer rocking on an out-of-square support face, seen as uneven wear around the raceway circle and rising running torque
- early fatigue from thrust reversal hammering the unloaded raceway, because the bearing has no contact surfaces for the opposite direction
- 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 511 light section is the speed-friendly end of the thrust-ball plan — for the same 35 mm bore it gives up load to gain OD, height and limiting-speed headroom.
- Never substitute a double-direction bearing drawing part-for-part: the single-direction 51107 stack height of 12 mm and washer set differ from the double-direction execution.
- Shock thrust above C0a 44.5 kN leaves dents that later become fatigue origins — crane-hook and press applications need the static check, not just the life calculation.
- Below the minimum axial load the balls skid; the catalogue Ca of 20.4 kN never saves a bearing that is running too lightly loaded at 3,900 r/min.
- The Ca 20.4/C0a 44.5 kN ratings and 2.02 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 51107; 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 51107?
51107 is a single-direction thrust ball bearing to ISO 104: 35 mm shaft-washer bore, 52 mm outside diameter, 12 mm stack height (1.378 x 2.047 x 0.472 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 20.4 kN, C0a 44.5 kN and a 2.02 kN fatigue load limit Pu; the grease limiting speed is 3,900 r/min and the oil rating 5,600 r/min; mass about 85 g.
How is the 51107 designation structured?
511 is the dimension series (light-section 51100 thrust family); 07 encodes the 35 mm bore (bore code x 5). The 52 mm OD and 12 mm height follow the ISO 104 boundary plan for that series.
Can 51107 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 51107?
At the 3,900 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 51107?
The 35/52/12 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 20.4 kN / C0a 44.5 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.