Koyo 51408 Thrust Ball Bearing, Single Direction, 40 x 90 x 36 mm
Available
This Koyo single direction thrust ball bearing (51400 series) is made of washer-shaped rings with a raceway groove, plus a ball and cage assembly. It accommodates axial load in one direction. The shaft race mounts on the shaft and the housing race in the housing. The back faces are flat.
The range has 3 sizes, with bores from 40 to 55 mm, boundary dimensions to JIS B 1512 and tolerances to JIS B 1514-2. Koyo bearings are made by JTEKT Corporation.
Where this product is used
- Automobile king pins
- Machine tool spindles
Features
- Accommodates axial load in one direction only
- Flat back faces
- Dynamic and static equivalent axial load: Pa = Fa and P0a = Fa
- Boundary dimensions to JIS B 1512, tolerances to JIS B 1514-2
- Standard cage: pressed steel
- Basic dynamic axial load ratings 113 to 178 kN and static 205 to 359 kN depending on size
Key specifications
| Specification | Detail |
|---|---|
| Bearing type | Single direction thrust ball bearing |
| Series | 51400 |
| Back faces | Flat |
| Bore diameter d | 40 to 55 mm |
| Outside diameter D | 90 to 120 mm |
| Height T | 36 to 48 mm |
| Basic dynamic axial load rating Ca | 113 to 178 kN |
| Basic static axial load rating C0a | 205 to 359 kN |
| Limiting speed, grease lubrication | 1,200 to 1,700 min-1 |
| Limiting speed, oil lubrication | 1,900 to 2,600 min-1 |
| Mass | 1.14 to 2.64 kg |
| Standard cage | Pressed steel |
| Dimensions and tolerances | JIS B 1512 (boundary dimensions), JIS B 1514-2 (tolerances) |
| Brand | Koyo (JTEKT) |
Available sizes
| Designation | Bore d (mm) | Outer D (mm) | Height T (mm) | r min (mm) | Ca (kN) | C0a (kN) | Speed, grease (min-1) | Speed, oil (min-1) | Mass (kg) |
|---|---|---|---|---|---|---|---|---|---|
| 51408 | 40 | 90 | 36 | 1.1 | 113 | 205 | 1,700 | 2,600 | 1.14 |
| 51410 | 50 | 110 | 43 | 1.5 | 148 | 283 | 1,400 | 2,100 | 1.99 |
| 51411 | 55 | 120 | 48 | 1.5 | 178 | 359 | 1,200 | 1,900 | 2.64 |
Selecting the right option
Select by bore d first, then check the outside diameter D and height T in the table against your housing.
Thrust ball bearings carry axial load only. Neither the single nor the double direction type is suitable for applications that involve radial load or high-speed rotation. Compare the limiting speed for your size with the shaft speed.
A certain degree of axial load is needed for the bearing to operate satisfactorily. At high speed, centrifugal force and the gyro moment can make the balls slide on the raceways and damage them, so the bearing is mounted without clearance with an axial load above the minimum necessary.
A bearing with flat back faces does not allow misalignment. If mounting errors are likely, JTEKT also makes a type with a spherical back face.
Fitting and use
Make sure the bearing races sit square to their supports and that the supporting surface is wide enough.
The shaft shoulder diameter da should be larger than the pitch diameter of the ball set, and the housing shoulder diameter Da smaller than it. The da min and Da max values for each size are in the variant specification.
Related products
Also available from Koyo: the 51100 series range, the 51200 series range and the 51300 series range.
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40 x 90 x 36mm bearing
Model Number: 51408/KOYO
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50 x 110 x 43mm bearing
Model Number: 51410/KOYO
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55 x 120 x 48mm bearing
Model Number: 51411/KOYO
