QJ1248-MPA

d	240 mm	Bore diameter
D	440 mm	Outside diameter
B	85 mm	Width
Cr	660,000 N	Basic dynamic load rating, radial
C0r	1,220,000 N	Basic static load rating, radial
Cur	38,000 N	Fatigue load limit, radial
nG	2,600 1/min	Limiting speed
nϑr	1,390 1/min	Reference speed
≈m	61.6 kg	Weight

 

da min	257 mm	Minimum diameter shaft shoulder
Da max	423 mm	Maximum diameter of housing shoulder
ra max	3 mm	Maximum fillet radius

 

rmin	4 mm	Minimum chamfer dimension
D1	367.9 mm	Shoulder diameter outer ring
d1	314.95 mm	Shoulder diameter inner ring
a	340 mm	Distance between the apexes of the pressure cones
α	45 °	Contact angle

 

Tmin	-30 °C	Operating temperature min.
Tmax	200 °C	Operating temperature max.

 

QJ1248-MPA four-point contact ball bearing, a bearing type characterized by the unique ability to support radial and axial loads in two directions simultaneously. The design uses two rows of balls that interact with four contact points on the inner and outer rings, which can effectively distribute forces and optimize performance in demanding applications.

One of the outstanding features of the QJ1248-MPA bearing is its high load-bearing capacity. The four-point contact configuration ensures that the bearing can withstand considerable axial forces, making it an ideal choice for applications that require bidirectional thrust capabilities. The low coefficient of friction helps improve efficiency and reduce energy losses. The bearing's ability to accommodate misalignment enhances versatility and allows reliable operation even under less than ideal mounting conditions.

The materials, bearing rings and balls of the QJ1248-MPA bearing are made of high-quality bearing steel, which has excellent hardness, wear resistance and fatigue strength. The material maintains its structural integrity even under long-term stress and high temperature conditions. Precision-ground raceways and high-quality balls achieve smoother operation and longer service life, reducing the need for frequent maintenance or replacement.

The design of the QJ1248-MPA bearing complements its corrosion resistance, which is achieved by applying a rugged surface treatment such as chrome plating or stainless steel. These characteristics make this bearing suitable for harsh environments, including applications involving moisture, chemicals or other corrosive substances. Its sealed or shielded versions further enhance protection from contaminants, ensuring long-term reliability in dirty or difficult operating conditions.

Applications for QJ1248-MPA four-point contact ball bearings cover a wide range of industries. In the automotive field, this bearing type is used in gearboxes and differential systems to provide effective support for components subjected to bidirectional forces. It is also widely used in machine tools, robots and precision instruments, which require high precision and load handling capabilities.

In the renewable energy field, the QJ1248-MPA bearing plays an important role in wind turbine pitch systems, which can effectively manage the axial forces generated during turbine operation. In industrial machinery, it is used in rolling mills, compressors and heavy equipment that requires rugged and durable bearings, operating at high speeds and high loads.

NO.	d[mm]	D[mm]	B[mm]
QJ1252-N2-MPA-C3	260	480	90
QJ252-N2-MPA	260	480	80
QJ252-N2-MPA-C3	260	480	80
QJ1252-N2-MPA	260	480	90
QJ1972-N2-MPA	360	480	56
QJ344-N2-MPA	220	460	88
QJ344-N2-MPA-C3	220	460	88
QJ1060-MPA	300	460	74
QJ1060-N2-MPA-C3	300	460	74
QJ1060-N2-MPA	300	460	74
QJ1248-N2-MPA	240	440	85
QJ1248-MPA	240	440	85
QJ248-N2-MPA	240	440	72
QJ248-N2-MPA-C3	240	440	72
QJ340-N2-MPA	200	420	80
QJ1056-MPA	280	420	65
QJ340-N2-MPA-C3	200	420	80
QJ1056-N2-MPA	280	420	65
QJ1056-N2-MPA-C4	280	420	65
QJ244-N2-MPA	220	400	65

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