| Bearing number |
728 ACD/HCP4A |
| Size (mm) |
24x8x8 |
| Bore Diameter (mm) |
24 |
| Outer Diameter (mm) |
8 |
| Width (mm) |
8 |
| d |
8 mm |
| D |
24 mm |
| B |
8 mm |
| d1 |
13.1 mm |
| d2 |
13.1 mm |
| D1 |
18.9 mm |
| r1,2 - min. |
0.3 mm |
| r3,4 - min. |
0.2 mm |
| a |
7.8 mm |
| da - min. |
10.4 mm |
| db - min. |
10.4 mm |
| Da - max. |
21.6 mm |
| Db - max. |
22.2 mm |
| ra - max. |
0.3 mm |
| rb - max. |
0.2 mm |
| dn |
14.3 mm |
| Basic dynamic load rating - C |
3.6 kN |
| Basic static load rating - C0 |
1.3 kN |
| Fatigue load limit - Pu |
0.057 kN |
| Limiting speed for grease lubrication |
75000 r/min |
| Limiting speed for oil lubrication |
120000 mm/min |
| Ball - Dw |
4.762 mm |
| Ball - z |
8 |
| Gref |
0.228 cm3 |
| Calculation factor - e |
0.68 |
| Calculation factor - Y2 |
1.41 |
| Calculation factor - Y0 |
0.76 |
| Calculation factor - X2 |
0.67 |
| Calculation factor - Y1 |
0.92 |
| Preload class A - GA |
22 N |
| Preload class B - GB |
44 N |
| Preload class C - GC |
88 N |
| Preload class D - GD |
176 N |
| Calculation factor - f |
1.02 |
| Calculation factor - f1 |
0.99 |
| Calculation factor - f2A |
1 |
| Calculation factor - f2B |
1.01 |
| Calculation factor - f2C |
1.03 |
| Calculation factor - f2D |
1.06 |
| Calculation factor - fHC |
1.01 |
| Preload class A |
31 N/micron |
| Preload class B |
40 N/micron |
| Preload class C |
53 N/micron |
| Preload class D |
70 N/micron |
| r1,2 min. |
0.3 mm |
| r3,4 min. |
0.2 mm |
| da min. |
10.4 mm |
| db min. |
10.4 mm |
| Da max. |
21.6 mm |
| Db max. |
22.2 mm |
| ra max. |
0.3 mm |
| rb max. |
0.2 mm |
| Basic dynamic load rating C |
3.58 kN |
| Basic static load rating C0 |
1.34 kN |
| Fatigue load limit Pu |
0.057 kN |
| Attainable speed for grease lubrication |
75000 r/min |
| Attainable speed for oil-air lubrication |
120000 r/min |
| Ball diameter Dw |
4.762 mm |
| Number of balls z |
8 |
| Reference grease quantity Gref |
0.228 cm³ |
| Preload class A GA |
22 N |
| Static axial stiffness, preload class A |
31 N/µm |
| Preload class B GB |
44 N |
| Static axial stiffness, preload class B |
40 N/µm |
| Preload class C GC |
88 N |
| Static axial stiffness, preload class C |
53 N/µm |
| Preload class D GD |
176 N |
| Static axial stiffness, preload class D |
70 N/µm |
| Calculation factor f |
1.02 |
| Calculation factor f1 |
0.99 |
| Calculation factor f2A |
1 |
| Calculation factor f2B |
1.01 |
| Calculation factor f2C |
1.03 |
| Calculation factor f2D |
1.06 |
| Calculation factor fHC |
1.01 |
| Calculation factor e |
0.68 |
| Calculation factor (single, tandem) Y2 |
0.87 |
| Calculation factor (single, tandem) Y0 |
0.38 |
| Calculation factor (single, tandem) X2 |
0.41 |
| Calculation factor (back-to-back, face-to-face) Y1 |
0.92 |
| Calculation factor (back-to-back, face-to-face) Y2 |
1.41 |
| Calculation factor (back-to-back, face-to-face) Y0 |
0.76 |
| Calculation factor (back-to-back, face-to-face) X2 |
0.67 |
| Mass bearing |
0.015 kg |