SKF · rolling bearings
SKF 3311 DMA
Angular contact ball 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 | 55 mm |
|---|---|
| Outside diameter | 120 mm |
| Width | 49.2 mm |
| Contact angle | 45 ° |
| Basic dynamic load rating | 111 kN |
| Basic static load rating | 100 kN |
| Reference speed | 6000 r/min |
| Limiting speed | 5000 r/min |
| Contact type | Normal contact (two-point contact) |
| Number of rows | 2 |
| Locating feature, bearing outer ring | Without |
| Ring type | Two-piece inner ring and one-piece outer ring |
| Cage | Machined brass |
| Arrangement of contact angle (double-row bearing) | Back-to-back (O) |
| Matched arrangement | No |
| Universal matching bearing | No |
| Axial internal clearance | CN |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Without |
| Indicative carbon footprint for new product | 10.4 kg CO_2e |
| Product net weight | 2.8 kg |
| eClass code | 23-05-08-03 |
| UNSPSC code | 31171531 |
| Dimensions · Bore diameter · (d) | 55 mm |
| Dimensions · Outside diameter · (D) | 120 mm |
| Dimensions · Width · (B) | 49.2 mm |
| Dimensions · Shoulder diameter inner ring for two-piece inner ring · (d_1) · ≈ | 81.4 mm |
| Dimensions · Shoulder diameter outer ring · (D_1) · ≈ | 104.4 mm |
| Dimensions · Chamfer dimension inner ring for two-piece inner ring · (r_1,2) · min. | 2 mm |
| Dimensions · Distance pressure point(s) · (a) | 114 mm |
| Abutment dimensions · Abutment diameter shaft · (d_a) · min. | 66 mm |
| Abutment dimensions · Abutment diameter housing · (D_a) · max. | 109 mm |
| Abutment dimensions · Fillet radius · (r_a) · max. | 2 mm |
| Calculation data · Basic dynamic load rating · (C) | 111 kN |
| Calculation data · Basic static load rating · (C_0) | 100 kN |
| Calculation data · Fatigue load limit · (P_u) | 4.3 kN |
| Calculation data · Reference speed | 6000 r/min |
| Calculation data · Limiting speed | 5000 r/min |
| Calculation data · Calculation factor · (k_r) | 0.095 |
| Calculation data · Limiting value · (e) | 1.3 |
| Calculation data · Calculation factor · (X) | 0.54 |
| Calculation data · Calculation factor · (Y_0) | 0.44 |
| Calculation data · Calculation factor · (Y_1) | 0.47 |
| Calculation data · Calculation factor · (Y_2) | 0.81 |
Family specifications and selection conditions
| Product description | Double row angular contact ball bearings, with two-piece inner ring, correspond to a pair of single row angular contact ball bearings in a back-to-back arrangement, while requiring less axial space than the equivalent pair of single row angular contact ball bearings. The two-piece inner ring enables incorporation of a larger number of balls, with a larger contact angle, providing a high load carrying capacity, especially in the axial direction. |
|---|---|
| Manufacturer features | Accommodate very high axial loads in both directions, radial loads, and tilting moments • Suitable where a stiff bearing arrangement is required • Separable design means outer ring with ball and cage assemblies can be mounted independently of the inner ring halves |
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.