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NNU4960BK/SPW33 super precision cylindrical roller bearing specification
| Designation | NNU-4960-BK/SPW33 | |
| Category | ||
| Cylindrical roller bearings, double row, super-precision | ||
| Dimensions | ||
| d (Bore diameter) | 300 mm | 11.811 in |
| D (Outer diameter) | 420 mm | 16.535 in |
| B (Width) | 118 mm | 4.646 in |
| W (Weight) | 50 kg | 110 lbs |
| Technical Data | ||
| Cr (kN) Basic dynamic load rating | 1020 | |
| C0r (kN) Basic static load rating | 2360 | |
| Fatigue load limit (kN) | 224 | |
| Attainable speed for grease lubrication (r/min) | 1800 | |
| Attainable speed for oil-air lubrication (r/min) | 2000 | |
| Reference grease quantity (cm3) | 420 | |
| Static Radial Stiffness(guideline value) (N/um) | 8050 | |
| Internal design | B= Modified internal design K=tapered bore 1:12 | |
| Lubrication | Annular groove and three lubrication holes in the outer ring | |
| Precision | SP | |
NNU.4960.BK.SPW33 cylindrical roller bearing 300*420*118 mm
| 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] | |
| NNU 4956 B/SPW33 | 280 | 380 | 100 | 765 | 1 800 | 1 900 | 2 200 |
| NNU 4956 BK/SPW33 | 280 | 380 | 100 | 765 | 1 800 | 1 900 | 2 200 |
| NN 3060 K/SPW33 | 300 | 460 | 118 | 1 250 | 2 400 | 1 700 | 1 900 |
| NNU 4960 B/SPW33 | 300 | 420 | 118 | 1 020 | 2 360 | 1 800 | 2 000 |
| NNU 4960 BK/SPW33 | 300 | 420 | 118 | 1 020 | 2 360 | 1 800 | 2 000 |
| NN 3064 K/SPW33 | 320 | 480 | 121 | 1 320 | 2 600 | 1 600 | 1 800 |
| NNU 4964 B/SPW33 | 320 | 440 | 118 | 1 060 | 2 500 | 1 700 | 1 900 |
| NNU 4964 BK/SPW33 | 320 | 440 | 118 | 1 060 | 2 500 | 1 700 | 1 900 |
| NN 3068 K/SPW33 | 340 | 520 | 133 | 1 650 | 3 250 | 1 400 | 1 500 |
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