QJ 1296 N2MA Bearing

d	480 mm	Bore diameter
D	870 mm	Outside diameter
B	170 mm	Width
d1	≈629 mm	Shoulder diameter inner ring
D1	≈721 mm	Shoulder diameter outer ring/ inner diameter housing washer
a	675 mm	Distance pressure point(s)
h	32 mm	Locating slot depth outer ring
b	20.5 mm	Locating slot width outer ring
r0	3 mm	Corner radius locating slot
r1,2	min.7.5 mm	Chamfer dimension inner ring

da	min.516 mm	Abutment diameter shaft
Da	max.834 mm	Abutment diameter housing
ra	max.6 mm	Fillet radius

Basic dynamic load rating	C	1 680 kN
Basic static load rating	C0	4 750 kN
Fatigue load limit	Pu	76.5 kN
Limiting speed		1 100 r/min
Calculation factor	A	131
Limiting value	e	1.34
Calculation factor	X	0.54
Calculation factor	Y0	0.44
Calculation factor	Y1	0.47
Calculation factor	Y2	0.81

Characteristics:

Four-point contact: The defining feature is the design of the inner and outer ring raceways. These raceways are shaped so that the balls make contact at four points under combined loads. This allows the bearing to support significant axial loads in either direction, as well as radial loads.

Single-row design: Despite their ability to handle combined loads, four-point contact ball bearings are typically single-row bearings, making them relatively compact.

Separable design: The inner ring (or sometimes the outer ring) is usually separable, simplifying mounting and dismounting, especially in applications where space is limited.

N2MA designation: This suffix provides specific information about the bearing's design and materials. While precise details require manufacturer's documentation, it likely refers to specific internal clearances, tolerances, cage materials, or other design variations. "N2" often indicates a specific internal design, and "MA" may refer to the material used for the cage (e.g., machined brass).

Advantages:

High axial load capacity in both directions: This is the primary advantage. They are designed to handle substantial axial loads in either direction, making them suitable for applications with reversing axial forces.

Combined load capability: They can also handle radial loads, making them versatile for applications with combined loading conditions.

Compact design: Compared to other bearing arrangements that might be required to handle similar combined loads (e.g., two angular contact ball bearings mounted back-to-back), four-point contact ball bearings offer a more compact solution.

Simplified mounting: The separable design simplifies mounting and dismounting, which can be beneficial in certain applications.

Applications:

QJ 1296 N2MA bearings are typically used in applications where combined radial and axial loads, particularly reversing axial loads, are present. Some common examples include:

Machine tool spindles: These bearings are often used in machine tool spindles to provide accurate and rigid support while handling both radial cutting forces and axial feed forces.

Pumps and compressors: In some pump and compressor designs, these bearings are used to support the shaft and handle both radial and axial loads.

Gearboxes: They can be found in certain gearbox designs where combined loads are present.

Other precision applications: Due to their ability to handle combined loads with high precision, they are used in various other precision applications.

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