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7221CD/P4A super precision angular contact ball bearing specification:
| Designation | 7221-CD/P4A | |
| Category | ||
| Angular contact ball bearing, super-precision | ||
| Dimensions | ||
| d (Bore diameter) | 105 mm | 4.134 in |
| D (Outer diameter) | 190 mm | 7.48 in |
| B (Width) | 36 mm | 1.417 in |
| W (Weight) | 3.87 kg | 8.53 lbs |
| Technical Data | ||
| Cr (kN) Basic dynamic load rating | 172 | |
| C0r (kN) Basic static load rating | 153 | |
| Fatigue load limit | 5.3 | |
| Attainable speed for grease lubrication (r/min) | 7500 | |
| Attainable speed for oil-air lubrication (r/min) | 12000 | |
| Contact angle | 15 ° | |
| Ball diameter (mm) | 26.988 mm | |
| Number of balls | 15 | |
| Reference grease quantity | 48.333 cm3 | |
| Seal | No | |
| Precision | P4A | |
Extended 7221.CD.P4A angular contact ball bearing 105*190*36
| Designation | Principal dimensions | Basic load ratings | Attainable speeds | ||||
| dynamic | static | Grease lubrication | Oil-air lubrication | ||||
| d[mm] | D[mm] | B[mm] | C[kN] | C0[kN] | [r/min] | [r/min] | |
| 71921 ACD/P4AH1 | 105 | 145 | 20 | 57.2 | 65.5 | 7 500 | 12 000 |
| 71921 ACD/P4AL | 105 | 145 | 20 | 57.2 | 65.5 | 7 500 | 12 000 |
| 71921 CD/HCP4A | 105 | 145 | 20 | 61.8 | 69.5 | 10 000 | 16 000 |
| 71921 CD/HCP4AH1 | 105 | 145 | 20 | 61.8 | 69.5 | 10 000 | 16 000 |
| 71921 CD/HCP4AL | 105 | 145 | 20 | 61.8 | 69.5 | 10 000 | 16 000 |
| 71921 CD/P4AH1 | 105 | 145 | 20 | 61.8 | 69.5 | 8 500 | 14 000 |
| 71921 CD/P4AL | 105 | 145 | 20 | 61.8 | 69.5 | 8 500 | 14 000 |
| 7221 ACD/HCP4A | 105 | 190 | 36 | 163 | 146 | 7 500 | 12 000 |
| 7221 ACD/P4A | 105 | 190 | 36 | 163 | 146 | 6 700 | 10 000 |
| 7221 CD/HCP4A | 105 | 190 | 36 | 172 | 153 | 9 000 | 14 000 |
| 7221 CD/P4A | 105 | 190 | 36 | 172 | 153 | 7 500 | 12 000 |
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