SKF · super precision bearings
SKF NNU 4940 BK/SPW33
Super-precision cylindrical roller bearings — manufacturer technical reference and quotation support in Saudi Arabia.
لطلب عرض سعر في السعودية، أرسل رقم القطعة أو المقاس والكمية والمدينة. يُرجى تأكيد التوافق والتوفر والسعر مع فريقنا.
| Bore diameter | 200 mm |
|---|---|
| Outside diameter | 280 mm |
| Width | 80 mm |
| Basic dynamic load rating | 484 kN |
| Basic static load rating | 1040 kN |
| Attainable speed for grease lubrication | 2600 r/min |
| Attainable speed for oil-air lubrication | 3000 r/min |
| Bearing part | Complete bearing |
| Number of rows | 2 |
| Bore type | Tapered 1:12 |
| Cage | Machined metal |
| Design | NNU |
| Number of flanges, outer ring | 3 |
| Number of flanges, inner ring | 0 |
| Loose flange | None |
| Radial internal clearance | C1 |
| Tolerance class | Class SP (SP) |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Annular groove and lubrication holes |
| Indicative carbon footprint for new product | 55.9 kg CO_2e |
| Product net weight | 15.1 kg |
| eClass code | 23-05-09-01 |
| UNSPSC code | 31171505 |
| Dimensions · Bore diameter · (d) | 200 mm |
| Dimensions · Outside diameter · (D) | 280 mm |
| Dimensions · Width · (B) | 80 mm |
| Dimensions · Shoulder diameter outer ring (NNU design) · (D_1) | 252.2 mm |
| Dimensions · Raceway diameter inner ring (NNU design) · (F) | 225 mm |
| Dimensions · Width annular lubrication groove at outer ring · (b) | 11.1 mm |
| Dimensions · Diameter lubrication hole (outer ring) · (K) | 3 mm |
| Dimensions · Chamfer dimension outer ring · (r_1,2) · min. | 2.1 mm |
| Dimensions · Chamfer dimension inner ring (bearing with tapered bore) · (r_3,4) · min. | 1.1 mm |
| Dimensions · Permissible axial displacement from the normal position of one bearing ring relative to the other (all) · (s) · max. | 3.7 mm |
| Abutment dimensions · Abutment diameter shaft · (d_a) · min. | 211 mm |
| Abutment dimensions · Abutment diameter shaft (NNU design) · (d_a) · max. | 222 mm |
| Abutment dimensions · Abutment diameter housing · (D_a) · max. | 269 mm |
| Abutment dimensions · Fillet radius · (r_a) · max. | 2 mm |
| Abutment dimensions · Oil nozzle position (not for variants with TNHA cage) · (d_n) | 227 mm |
| Calculation data · Basic dynamic load rating · (C) | 484 kN |
| Calculation data · Basic static load rating · (C_0) | 1040 kN |
| Calculation data · Fatigue load limit · (P_u) | 106 kN |
| Calculation data · Attainable speed for grease lubrication | 2600 r/min |
| Calculation data · Attainable speed for oil-air lubrication | 3000 r/min |
| Calculation data · Reference grease quantity · (G_ref) | 117 cm³ |
| Calculation data · Static radial stiffness (guideline value) | 5480 N/µm |
Family specifications and selection conditions
| Product description | Super-precision double row cylindrical roller bearings in the NNU 49 series are designed to accommodate heavy radial loads and high speeds, while providing a high degree of stiffness. Having three flanges on the outer ring and no flanges on the inner ring, the bearings can accommodate axial displacement in both directions. The separable design simplifies mounting and dismounting, particularly when load conditions require both rings to have an interference fit. The tapered bore enables accurate adjustment of clearance or preload during mounting. |
|---|---|
| Manufacturer features | High radial load carrying capacity • Very high rigidity and high running accuracy • Minimize noise, vibration and heat generation • Accommodate axial displacement in both directions • Lubrication feature • Thin section enabling compact application design |
Manufacturer references
Follow the complete manufacturer documentation for application restrictions, materials, tolerances and installation requirements. Limits may not apply simultaneously. We do not publish inferred stock, pricing or ratings.