QJ1068-MPA

d	340 mm	Bore diameter
D	520 mm	Outside diameter
B	82 mm	Width
Cr	760,000 N	Basic dynamic load rating, radial
C0r	1,640,000 N	Basic static load rating, radial
Cur	44,000 N	Fatigue load limit, radial
nG	2,070 1/min	Limiting speed
nϑr	960 1/min	Reference speed
≈m	66.4 kg	Weight

Mounting dimensions

da min	358 mm	Minimum diameter shaft shoulder
Da max	502 mm	Maximum diameter of housing shoulder
ra max	4 mm	Maximum fillet radius

Dimensions

rmin	5 mm	Minimum chamfer dimension
D1	459 mm	Shoulder diameter outer ring
d1	403.6 mm	Shoulder diameter inner ring
a	301.1 mm	Distance between the apexes of the pressure cones
α	35 °	Contact angle

Temperature range

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

The QJ1068-MPA four-point contact ball bearing is a distinctive component engineered to accommodate both radial and axial loads, making it a versatile choice for various applications. This bearing type features a unique design that allows the ball elements to make contact with the inner and outer rings at four distinct points, resulting in improved load distribution and enhanced performance. This design not only increases the bearing's load carrying capacity but also minimizes frictional losses, making it an ideal solution for high-speed applications.

One of the standout characteristics of the QJ1068-MPA is its ability to handle thrust loads in both directions, a feature that sets it apart from standard deep groove ball bearings. This is particularly beneficial in applications where axial displacement is present, as it can support more complex loading scenarios without compromising reliability. The four-point contact point configuration allows for the simultaneous accommodation of radial and axial forces, which is advantageous in machinery and equipment that experiences varying load conditions.

Another important aspect of the QJ1068-MPA bearing is its relatively compact size, which does not sacrifice performance. The design typically leads to a sleeker assembly, helping to save space within machinery while ensuring robust operation. This size advantage can be crucial in applications where space is restricted, such as in robotics, automotive systems, and precision engineering machinery.

In terms of application, the QJ1068-MPA is well-suited for use in high-speed rotating equipment, such as electric motors, turbines, and gearboxes. The bearing's ability to maintain performance at high rotational speeds while providing durability under challenging operational conditions makes it a reliable choice. Additionally, it is commonly found in the aerospace industry, where precision and reliability are paramount. Its robust design can withstand the rigorous demands of various aircraft systems, contributing to overall safety and performance.

The material composition of the QJ1068-MPA further enhances its application versatility. Typically made from high-quality steel, these bearings are designed to resist wear and corrosion, ensuring a longer service life even in harsh environments. Advanced manufacturing techniques are employed to minimize surface roughness and improve surface integrity, contributing to lower operational noise levels and enhanced overall efficiency.

Furthermore, the QJ1068-MPA is compatible with various lubrication methods, including grease or oil systems, allowing flexibility in maintenance practices. Proper lubrication is essential for maximizing the bearing's performance and lifespan, as it reduces friction and heat generation during operation. Depending on the specific requirements of the application, users can choose the most suitable lubrication strategy to ensure optimal functioning.

In summary, the QJ1068-MPA four-point contact ball bearing stands out due to its unique ability to handle axial and radial loads simultaneously. Its compact design, strength, and versatility make it an excellent choice for a wide range of high-performance applications. From aerospace to automotive and industrial machinery, this bearing contributes to efficiency, durability, and reliability, making it a preferred option for engineers and designers in various fields. As industries continue to advance toward greater precision and performance, the QJ1068-MPA is poised to meet the growing demands of modern applications.

NO.	d[mm]	D[mm]	B[mm]
QJ260-N2-MPA	300	540	85
QJ260-N2-MPA-C3	300	540	85
QJ352-N2-MPA	260	540	102
QJ1072-MPA	360	540	82
QJ1068-MPA	340	520	82
QJ1068-MPA-C3	340	520	82
QJ1068-N2-MPA	340	520	82
QJ348-N2-MPA	240	500	95
QJ348-N2-MPA-C3	240	500	95
QJ256-N2-MPA-C3	280	500	80
QJ348-N2-MPA-J30PD-C3	240	500	95
QJ348-N2-MPA-J30PC-C3	240	500	95
QJ1256-N2-MPA	280	500	90
QJ1256-N2-MPA-C3	280	500	90
QJ256-N2-MPA	280	500	80
QJ252-N2-MPA-J30PC-C3	260	480	80
QJ1064-N2-MPA	320	480	74
QJ1064-N2-MPA-C3	320	480	74
QJ1252-MPA	260	480	90
QJ1252-N2-MPA	260	480	90

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