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Borelli SAE B 2-Bolt Flange Support for Group 3 Pumps – 25608 Series
The Borelli SAE B 2-Bolt Flange Support for Group 3 Pumps – 25608 Series ensures proper mechanical coupling and protection of Group 3 hydraulic pumps. Equipped with a 3208A rolling bearing and a 22.2 mm shaft, it withstands radial loads ranging from 140 daN to 318 daN, with an axial load capacity of 245 daN. It includes dedicated sealing components with O-rings and a 35x45x7 oil seal. The available product and component codes are: 25608, 426628, 25003/C1, 403200, 401740, 303545, 503208, 25008.1, 904000, AC 22.2.
Borelli SAE B 2-Bolt Flange Support for Group 3 Pumps – 25608 Series
The Borelli 25608 Series flanged support is specifically designed for rigid mechanical coupling with Group 3 hydraulic pumps. The assembly includes a main housing (position 7, code 25008.1) coupled to a shaft with a nominal diameter of 22.2 mm (position 9, code AC 22.2, dimension 22.22 H8). The shaft features a standardized 6x6x28 keyway compliant with UNI 6604 dimensional specifications (position 1, code 426628).
Rotational support is provided by a 3208A bearing (position 6, code 503208), axially secured by two UNI 7435-40 Seeger retaining rings (position 8, code 904000). The sealing system includes a radial shaft seal measuring 35x45x7 mm (position 5, code 303545), supported by an O-ring with code 403200 (position 3), an O-ring with code 401740 (position 4), and a metal/structural retaining ring with code 25003/C1 (position 2).
The mounting interface follows the standardized SAE B 2-bolt flange configuration. The centering pilot has a diameter of 101.6 mm (f7 tolerance), with 14 mm diameter slotted mounting holes arranged on a nominal center-to-center distance of 146 mm. The overall lateral flange dimension is 175 mm, with a housing width of 120 mm and a total housing depth of 97 mm. The distance from the shaft centerline to the bottom surface is 57 mm, while the distance from the shaft centerline to the upper mounting hole centerline is 50.75 mm (H7). The shaft projects 40 mm beyond the mounting face, with a usable cylindrical section of 52 mm and positioning shoulders measuring 15 mm and 22 mm. On the pump side, the assembly features an A35x214 female splined shaft connection.
The mechanical assembly of the 25608 Series is designed to withstand demanding loads generated by direct or indirect power transmission systems:
| Specification | Value |
|---|---|
| Product Series | 25608 |
| Flange Type | SAE B 2-bolt |
| Compatible Pump Group | Group 3 (Gr. 3) |
| Flange Centering Pilot Diameter | 101.6 mm (f7 tolerance) |
| Mounting Hole Center-to-Center Distance | 146 mm |
| Mounting Hole Diameter | 14 mm |
| Front Shaft Diameter | 22.2 mm (22.22 H8) |
| Pump-Side Coupling Profile | A35x214 female spline |
| Bearing Type | 3208A ball bearing |
| Key Dimensions | 6x6x28 mm (UNI 6604) / 6.35 mm thickness |
| Shaft Seal Dimensions | 35x45x7 mm |
| Applicable Radial Loads | 140 daN / 245 daN / 318 daN |
| Maximum Axial Load | 245 daN |
| Position | Component Code | Description | Quantity |
|---|---|---|---|
| Assembly | 25608 | SAE B 2-bolt flange support for Group 3 pumps | 1 |
| 1 | 426628 | 6x6x28 key UNI 6604 | 1 |
| 2 | 25003/C1 | Ring | 1 |
| 3 | 403200 | O-ring | 1 |
| 4 | 401740 | O-ring | 1 |
| 5 | 303545 | 35x45x7 shaft seal | 1 |
| 6 | 503208 | 3208A bearing | 1 |
| 7 | 25008.1 | Housing | 1 |
| 8 | 904000 | Seeger retaining ring UNI 7435-40 | 2 |
| 9 | AC 22.2 | Shaft dia. 22.2 mm | 1 |