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SKF
Four Point Contact B. SKF QJ328 N2MA
- Technical data
- Inner diameter
- 140 mm
- Outer diameter
- 300 mm
- Width
- 62 mm
- Seal
- None, open bearing
- Cage
- Brass cage
- Clearance
- Normal radial clearance
- Running accuracy
- Dimensional accuracy P6, Running accuracy P5
- Groove(s) on outer ring
- 2 retaining grooves on outer ring shifted by 180 degrees
- Design
- Split inner ring
- Temperature range
- -30 to +200 °C
- Version
- Explorer
- Weight
- 22,62 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 2 | 65,19 € | 1.238,63 € |
| 3 | 130,38 € | 1.173,44 € |
Four Point Contact B. SKF QJ328 N2MA
The SKF QJ328 N2MA four-point bearing accommodates high axial forces in both directions whilst maintaining compact dimensions of 140 × 300 × 62 mm.
The QJ328 N2MA four-point bearing is a single-row radial angular contact ball bearing in the SKF Explorer series. The design features raceways whose geometry accommodates axial forces in both directions. Thanks to the split inner ring, a large number of rolling elements can be accommodated, which enhances the axial load-carrying capacity. This open rolling bearing has a standard radial clearance and is designed for a temperature range of -30 to +200 degrees.
What is the QJ328 N2MA four-point bearing suitable for?
This bearing is primarily used where predominantly axial loads are present within a limited axial installation space. Typical applications are found in industrial settings where alternating thrust forces act on the shaft. The bearing is often combined with a pure radial bearing, specifically guiding the shaft in the axial direction whilst the radial bearing absorbs the transverse forces.
What is the function of the retaining grooves and the split inner ring?
The bearing has two retaining grooves in the outer ring, offset by 180 degrees. These grooves allow the bearing to be secured in the housing using retaining pins and serve to prevent the outer ring from rotating unintentionally. The split inner ring facilitates assembly: the two ring halves and the outer ring, together with the brass cage, can be fitted separately. The tolerance class is also relevant to the design, as the bearing is manufactured to dimensional accuracy class P6 and running accuracy class P5.
What makes the QJ328 N2MA four-point bearing stand out?
As a single-row angular contact ball bearing, this design accommodates axial forces in both directions and requires significantly less axial space than double-row bearings. The split inner ring allows for a large number of rolling elements to be accommodated, enabling it to withstand high axial loads. A solid brass cage and retaining grooves in the outer ring make the bearing suitable for demanding industrial applications.
What are the dimensions of the QJ328 N2MA four-point bearing?
With a bore of 140 mm, an outer diameter of 300 mm and a width of 62 mm, the bearing complies with the standardised main dimensions for four-point bearings in this series. Before installation, it is advisable to check that these geometric specifications are compatible with the surrounding structure and the bearing seat.
What is the purpose of the retaining grooves on the outer ring?
Two retaining grooves on the outer ring, offset by 180 degrees, provide a positive anti-rotation lock within the housing. In conjunction with suitable retaining pins, they are designed to prevent the outer ring from moving within the housing seat under varying operating conditions. This is particularly advantageous when the bearing is mounted as a pure thrust bearing with radial housing clearance.
What is the tolerance class of the QJ328 N2MA bearing?
This design combines dimensional accuracy to tolerance class P6 with improved running accuracy to class P5. These tight manufacturing tolerances reduce run-out error during operation, facilitate precise shaft guidance and contribute to an even load distribution across the rolling elements.
What temperature range is the bearing suitable for?
The bearing is designed for operating temperatures ranging from -30 to +200 degrees Celsius. The brass cage offers high dimensional stability under thermal stress. As this is an open design without integrated seals, the lubricant selected must be suited to the specific operating temperature of the bearing location.
Why is the inner ring split in a four-point bearing?
The two-piece inner ring allows a particularly high number of balls to be fitted where the raceway grooves are deep, which significantly enhances the axial load-carrying capacity. Furthermore, this non-self-retaining design simplifies assembly and disassembly, as the inner ring halves and the outer ring with cage can be installed separately.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
info@skf.com, https://www.skf.com/uk/footer/site-ownership
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