SKF · super precision bearings
SKF NN 3056 K/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 | 280 mm |
|---|---|
| Outside diameter | 420 mm |
| Width | 106 mm |
| Basic dynamic load rating | 1080 kN |
| Basic static load rating | 2080 kN |
| Attainable speed for grease lubrication | 1900 r/min |
| Attainable speed for oil-air lubrication | 2200 r/min |
| Bearing part | Complete bearing |
| Number of rows | 2 |
| Bore type | Tapered 1:12 |
| Cage | Machined metal |
| Design | NN |
| Number of flanges, outer ring | 0 |
| Number of flanges, inner ring | 3 |
| 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 | 180 kg CO_2e |
| Product net weight | 48.7 kg |
| eClass code | 23-05-09-01 |
| UNSPSC code | 31171505 |
| Dimensions · Bore diameter · (d) | 280 mm |
| Dimensions · Outside diameter · (D) | 420 mm |
| Dimensions · Width · (B) | 106 mm |
| Dimensions · Shoulder diameter inner ring (NN design) · (d_1) | 332.8 mm |
| Dimensions · Raceway diameter outer ring (NN design) · (E) | 384 mm |
| Dimensions · Width annular lubrication groove at outer ring · (b) | 15.3 mm |
| Dimensions · Diameter lubrication hole (outer ring) · (K) | 7.5 mm |
| Dimensions · Chamfer dimension outer ring · (r_1,2) · min. | 4 mm |
| Dimensions · Chamfer dimension inner ring (bearing with tapered bore) · (r_3,4) · min. | 1.5 mm |
| Dimensions · Permissible axial displacement from the normal position of one bearing ring relative to the other (all) · (s) · max. | 5 mm |
| Abutment dimensions · Abutment diameter shaft · (d_a) · min. | 296 mm |
| Abutment dimensions · Abutment diameter housing · (D_a) · min. | 387 mm |
| Abutment dimensions · Abutment diameter housing · (D_a) · max. | 404 mm |
| Abutment dimensions · Fillet radius · (r_a) · max. | 3 mm |
| Abutment dimensions · Oil nozzle position (not for variants with TNHA cage) · (d_n) | 375.3 mm |
| Calculation data · Basic dynamic load rating · (C) | 1080 kN |
| Calculation data · Basic static load rating · (C_0) | 2080 kN |
| Calculation data · Fatigue load limit · (P_u) | 196 kN |
| Calculation data · Attainable speed for grease lubrication | 1900 r/min |
| Calculation data · Attainable speed for oil-air lubrication | 2200 r/min |
| Calculation data · Reference grease quantity · (G_ref) | 420 cm³ |
| Calculation data · Static radial stiffness (guideline value) | 6010 N/µm |
Family specifications and selection conditions
| Product description | Super-precision double row cylindrical roller bearings in the NN 30 series provide a unique balance between load carrying capacity, rigidity and speed. Having three flanges on the inner ring and no flanges on the outer 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 | Very high radial load carrying capacity • High rigidity and high running accuracy • Minimize noise, vibration and heat generation • Accommodate axial displacement in both directions • Lubrication feature |
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.