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NNU4921BK/SPW33 super precision cylindrical roller bearing specification
| Designation | NNU 4921 BK/SPW33 | |
| Category | ||
| Cylindrical roller bearings, double row, super-precision | ||
| Dimensions | ||
| d (Bore diameter) | 105 mm | 4.134 in |
| D (Outer diameter) | 145 mm | 5.709 in |
| B (Width) | 40 mm | 1.575 in |
| W (Weight) | 2 kg | 4.41 lbs |
| Technical Data | ||
| Cr (kN) Basic dynamic load rating | 130 | |
| C0r (kN) Basic static load rating | 260 | |
| Fatigue load limit (kN) | 30 | |
| Attainable speed for grease lubrication (r/min) | 5300 | |
| Attainable speed for oil-air lubrication (r/min) | 6000 | |
| Reference grease quantity (cm3) | 15 | |
| Static Radial Stiffness(guideline value) (N/um) | 3040 | |
| Internal design | K=tapered bore 1:12 | |
| Cage design | Glass fibre reinforced PA66 cage, roller centred | |
| Precision | SP | |
NNU.4921.BK.SPW33 cylindrical roller bearing 105*145*40
| 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] | |
| NN 3020 KTN9/SP | 100 | 150 | 37 | 151 | 250 | 5 600 | 6 300 |
| NN 3020 TN9/SP | 100 | 150 | 37 | 151 | 250 | 5 600 | 6 300 |
| NNU 4920 B/SPW33 | 100 | 140 | 40 | 128 | 255 | 5 600 | 6 300 |
| NNU 4920 BK/SPW33 | 100 | 140 | 40 | 128 | 255 | 5 600 | 6 300 |
| NN 3021 KTN9/SP | 105 | 160 | 41 | 190 | 305 | 5 300 | 6 000 |
| NN 3021 TN9/SP | 105 | 160 | 41 | 190 | 305 | 5 300 | 6 000 |
| NNU 4921 B/SPW33 | 105 | 145 | 40 | 130 | 260 | 5 300 | 6 000 |
| NNU 4921 BK/SPW33 | 105 | 145 | 40 | 130 | 260 | 5 300 | 6 000 |
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