70/850-MPB-UA Solid Brass Cage, Angular Contact Ball Bearings, Single Row
The 70/850-MPB-UA Single-row angular contact ball bearings are widely used in precision spindles and transmission systems of heavy equipment, such as: large machine tool spindles (machining centers, grinding machines), industrial robot joints, centrifuges, compressors, large pumps, and wind power generation equipment spindles.
The 70/850-MPB-UA bearing is a Angular contact ball bearings, single row with an inner diameter of 850 mm , an outer diameter of 1220 mm, a width of 165 mm. It typically uses PN grade precision tolerances and bearing steel rings, bearing steel rolling mlement. Its dynamic radial rated load is approximately 1579952 N, its static radial rated load is approximately 5199982 N. Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
70/850-MPB-UA bearings ( 850 mm x 1220 mm x 165 mm) have the advantages of High load-bearing capacity, high rigidity, and long service life, and are therefore widely used in the Construction machinery, wind power generation, port machinery, solar tracking systems, industrial robots, medical equipment, aerospace, and military equipment.
| Part Number | 70/850-MPB-UA |
| Bearing Type | Angular contact ball bearings, single row |
| Series | 70..-MPB |
| Contact angle - α [°] | 30 |
| Rows NO. | single |
| Manufacturer Part Code | 70/850-MPB-UA |
| Cage | MPB = Solid brass cage, guided on inner ring |
| Lubricant | Without |
| Seal type | Open |
| Bearing pair | UA = Universal design for mounting in pairs, bearing pair has small axial internal clearance in O and X arrangement |
| Heat stabilization | S1 = up to 200° |
| m Weight [kg] | 629 |
| Reference From | FAG 70/850-MPB-UA |
| Dimensions | |
| d φ Inside [inch] | 33.465 |
| D Φ Outside [inch] | 48.031 |
| B Width [inch] | 6.496 |
| r(min.) [inch] | 0.295 |
| r1(min.) [inch] | 0.157 |
| D1 [inch] | 42.829 |
| d1 [inch] | 38.953 |
| a [inch] | 15.012 |
| Performance | |
| Cr Radial Dynamic [N] | 1579952 |
| C0r Radial static [N] | 5199982 |
| Cur Radial Fatigue [N] | 83982 |
| nG Limiting speed (oil) [r/min] | 674 |
| nB Reference speed (grease) [r/min] | 359 |
| Mounting dimensions | |
| da(min.) [inch] | 34.567 |
| Da(max.) [inch] | 46.929 |
| Db(max.) [inch] | 47.457 |
| ra(max.) [inch] | 0.236 |
| ra1(max.) [inch] | 0.118 |
| Axial clearance | |
| Axial clearance per set - Amin [µm] | 304 |
| Tolerance for axial clearance or preload per set - Tol(+) [µm] | 28 |
The 70/850-MPB-UA Single-row angular contact ball bearings mainly consist of an inner ring, an outer ring, steel balls, and a cage. The raceways of the inner and outer rings are offset from each other, forming a contact angle. They are typically designed as non-separable bearings with contact angles of 15°, 25°, or 40°. The cage can be made of solid brass or phenolic resin.
The larger the contact angle of a single-row angular contact ball bearing (e.g., 40°), the stronger its axial load capacity. 15° or 25° contact angles are suitable for high-speed applications. They can simultaneously withstand radial loads and unidirectional axial loads. When installed in pairs (back-to-back, face-to-face, or in series), they can withstand bidirectional axial loads and improve rigidity. Larger bearings have higher basic dynamic load ratings, reaching hundreds of kN or more.
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