7256-B-MP-UA Angular Contact Ball Bearings, Single Row, Solid Brass Cage
The 7256-B-MP-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 7256-B-MP-UA bearing is a Angular contact ball bearings, single row with an inner diameter of 280 mm , an outer diameter of 500 mm, a width of 80 mm. It typically uses PN grade precision tolerances and bearing steel rings, bearing steel rolling mlement. Its dynamic radial rated load is approximately 499986 N, its static radial rated load is approximately 879963 N. Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: 7256B.MP.UA
7256-B-MP-UA bearings ( 280 mm x 500 mm x 80 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 | 7256-B-MP-UA |
| Design Type | B = Modified internal construction |
| Bearing Type | Angular contact ball bearings, single row |
| Series | 72..-B-MP |
| Contact angle - α [°] | 40 |
| Rows NO. | single |
| Manufacturer Part Code | 7256-B-MP-UA |
| Cage | MP = solid brass cage, ball guided |
| Equivalent | 7256B.MP.UA |
| 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] | 69.1 |
| Reference From | FAG 7256-B-MP-UA |
| Dimensions | |
| d φ Inside [inch] | 11.024 |
| D Φ Outside [inch] | 19.685 |
| B Width [inch] | 3.150 |
| r(min.) [inch] | 0.197 |
| r1(min.) [inch] | 0.079 |
| D1 [inch] | 16.260 |
| d1 [inch] | 14.488 |
| a [inch] | 8.016 |
| Performance | |
| Cr Radial Dynamic [N] | 499986 |
| C0r Radial static [N] | 879963 |
| Cur Radial Fatigue [N] | 23292 |
| nG Limiting speed (oil) [r/min] | 1928 |
| nB Reference speed (grease) [r/min] | 1344 |
| Mounting dimensions | |
| da(min.) [inch] | 11.811 |
| Da(max.) [inch] | 18.898 |
| Db(max.) [inch] | 19.252 |
| ra(max.) [inch] | 0.157 |
| ra1(max.) [inch] | 0.079 |
| Axial clearance | |
| Axial clearance per set - Amin [µm] | 130 |
| Tolerance for axial clearance or preload per set - Tol(+) [µm] | 16 |
The 7256-B-MP-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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