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FAG
Four Point Contact B. FAG QJ305 -MPA
- Technical data
- Inner diameter
- 25 mm
- Outer diameter
- 62 mm
- Width
- 17 mm
- Seal
- None, open bearing
- Cage
- Brass cage
- Clearance
- Normal radial clearance
- Running accuracy
- Tolerance class P0/PN2 / ABEC 1
- Groove(s) on outer ring
- Without groove
- Design
- Split inner ring
- Temperature range
- -30 to +150 °C
- Weight
- 0,28 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 15 | 2,64 € | 50,21 € |
| 30 | 5,28 € | 47,57 € |
Four Point Contact B. FAG QJ305 -MPA
The FAG QJ305-MPA four-point bearing, measuring 25 × 62 × 17 mm, accommodates high axial forces in both directions whilst requiring minimal axial installation space.
The QJ305-MPA four-point bearing is a specialised radial ball bearing from FAG Rolling Bearings, designed to transmit high axial forces in both directions. Due to the geometry of the raceways, the rolling elements contact the rings at a defined contact angle. This rolling bearing combines the characteristics of a double-row angular contact ball bearing with a narrower design. With dimensions of 25 mm inner diameter, 62 mm outer diameter and 17 mm width, this model is particularly suitable for bearing installations where space is limited.
In which installation situations does the QJ305-MPA four-point bearing prove its worth?
This bearing is primarily used where alternating or predominantly axial loads occur and precise guidance is required. This design is frequently used as a pure axial bearing in combination with a separate radial bearing. Under a purely axial load, the outer ring has radial clearance within the housing. As the design features no retaining grooves in the outer ring, it is secured in the housing via uniform axial and radial contact between the ring surfaces.
What is the function of the split inner ring and the brass cage in the QJ305-MPA?
The split inner ring facilitates assembly, as the bearing is not designed to be self-retaining. The outer ring with ball race and the two inner ring halves can be fitted separately. Furthermore, the two-piece design allows for the incorporation of a larger number of rolling elements. The solid brass cage guides the balls with low friction and ensures high mechanical strength. The design also features an open configuration without a seal, which requires an external lubricant supply.
What makes the QJ305-MPA four-point bearing stand out?
The design accommodates high axial loads from both directions and requires less axial installation space than double-row bearing arrangements. As a FAG radial ball bearing with a split inner ring, brass cage and defined contact angle, it complies with tolerance class P0 or ABEC 1 and does not require a groove in the outer ring.
What are the dimensions of this roller bearing?
With a bore of 25 mm, an outside diameter of 62 mm and a width of 17 mm, the bearing has standardised main dimensions. Before installation, it is advisable to check the mating dimensions of the shaft and the housing bore to ensure a precise axial fit.
Why does the bearing have a split inner ring?
The two-piece inner ring design allows a greater number of balls to be fitted, thereby increasing the axial load capacity. At the same time, however, this means the bearing is not self-retaining. This means that, during assembly, the outer ring together with the ball set and the two inner ring halves can be positioned separately on the shaft and in the housing.
What is the permissible temperature range for the four-point bearing?
The permissible operating temperature range is between -30 and +150 degrees Celsius. This range is determined by the dimensional stability of the rings and the lubricant. Thanks to the brass cage, the bearing retains its dimensional stability even at higher operating temperatures. For continuous use, a suitable grease or lubricating oil within this temperature range should be selected.
What is the standard radial clearance for this bearing?
The standard radial bearing clearance refers to the standard clearance between the balls and the raceways when the bearing is in its unassembled state. As four-point contact bearings are primarily designed for axial guidance, their internal geometry ensures clearance-free guidance under axial loads. For most standard applications without extreme temperature differences between the shaft and the housing, this standard clearance is appropriately selected.
What type of lubrication does the open design require?
As this bearing is supplied without integrated seals, you must lubricate the raceways via an external lubricant supply. Depending on the design and the operating environment, either oil or grease lubrication is suitable. In addition, an external seal on the housing protects the open bearing element from ingress of particles, moisture and premature loss of lubricant.
Schaeffler Technologies AG & Co. KG
Industriestraße 1-3, 91074 Herzogenaurach, Germany
info.de@schaeffler.com, https://www.schaeffler.de/de/meta/impressum/
10005465