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NNU4936BK/SPW33 super precision cylindrical roller bearing specification:
| Designation | NNU 4936 BK/SPW33 | |
| Category | ||
| Cylindrical roller bearings, double row, super-precision | ||
| Dimensions | ||
| d (Bore diameter) | 180 mm | 7.087 in |
| D (Outer diameter) | 250 mm | 9.843 in |
| B (Width) | 69 mm | 2.717 in |
| W (Weight) | 10.5 kg | 23.1 lbs |
| Technical Data | ||
| Cr (kN) Basic dynamic load rating | 402 | |
| C0r (kN) Basic static load rating | 850 | |
| Fatigue load limit (kN) | 88 | |
| Attainable speed for grease lubrication (r/min) | 3000 | |
| Attainable speed for oil-air lubrication (r/min) | 3400 | |
| Reference grease quantity (cm3) | 81 | |
| Static Radial Stiffness(guideline value) (N/um) | 5190 | |
| 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.4936.BK.SPW33 cylindrical roller bearing 180*250*69 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 4934 B/SPW33 | 170 | 230 | 60 | 336 | 695 | 3 400 | 3 800 |
| NNU 4934 BK/SPW33 | 170 | 230 | 60 | 336 | 695 | 3 400 | 3 800 |
| NN 3036 K/SPW33 | 180 | 280 | 74 | 561 | 1 000 | 3 000 | 3 200 |
| NNU 4936 B/SPW33 | 180 | 250 | 69 | 402 | 850 | 3 000 | 3 400 |
| NNU 4936 BK/SPW33 | 180 | 250 | 69 | 402 | 850 | 3 000 | 3 400 |
| NN 3038 K/SPW33 | 190 | 290 | 75 | 594 | 1 080 | 2 800 | 3 000 |
| NNU 4938 B/SPW33 | 190 | 260 | 69 | 402 | 880 | 2 800 | 3 200 |
| NNU 4938 BK/SPW33 | 190 | 260 | 69 | 402 | 880 | 2 800 | 3 200 |
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