Four Point Contact Ball Bearings

At Kriloha Ltd., we understand that “Design-Simplification” is the key to modern industrial efficiency. Our Four-Point Contact Ball Bearings are our engineered answer for “Bidirectional-Thrust” and “Compact-Stiffness”. As a premier provider of industrial components, Kriloha has developed a series that balances mechanical invincibility with the design agility required for space-constrained, high-load machinery.

The engineering of our four-point series is based on Multi-Point Load Vectoring. By precision-grinding the raceways to a Gothic Arch profile, we ensure that the bearing acts as a rigid anchor, capable of handling complex reversing loads within a single-row envelope. At Kriloha, we verify that our split inner rings are matched with extreme precision to ensure uniform load sharing and a “Smooth-Motion” barrier that stands up to punishing duty cycles. This creates a “Rigid-Resilient” support system that secures your highest-value rotating assets.

Manufacturing these bearings involves strict Contact-Angle Consistency and Runout Verification. We ensure that every component provides the vibration-free performance required for high-precision industrial lines. Whether you are overhauling a sophisticated industrial pump or designing a compact gearbox, Kriloha Four-Point Contact Bearings provide the mechanical durability your facility demands. By choosing Kriloha Ltd., you are investing in a “High-Efficiency” technology that secures the integrity of your energy and manufacturing infrastructure.

Bearing Table

SR. NO.	BEARING NO.	BOUNDARY DIMENSIONS (in mm)					MASS (~ Kg.)
SR. NO.	BEARING NO.	d	D	D1	B	b	MASS (~ Kg.)
1	SB 3512	22.000	48.000	–	36.000	–	0.350
2	509732	25.000	68.000	72.900	19.000	7.000	0.380
3	517204	25.000	68.000	72.900	19.000	7.000	0.380
4	508461 B	28.000	80.000	90.000	19.000	6.000	0.630
5	QJ 207 MPA	35.000	72.000	–	17.000	–	0.350
6	QJ 307	35.000	80.000	–	21.000	–	0.560
7	QJ 208 MPA	40.000	80.000	–	18.000	–	0.450
8	QJ 308	40.000	90.000	–	23.000	–	0.670
9	QAJ 209 MPA	45.000	85.000	–	19.000	–	0.520
10	QJ 309 MPA	45.000	100.000	–	25.000	–	1.050
11	QJ 309 (St.Cage)	45.000	100.000	–	25.000	–	0.940

Primary Use Cases

Industrial Gearboxes: Used as the primary thrust-carrying component in high-torque reduction drives.
Compressors and Pumps: Managing the bidirectional axial thrust generated by high-pressure fluid displacement.
Slewing Drives: Providing stable rotation for small-to-medium turntable applications where tilting moments are present.
Machine Tool Tables: Ensuring precise axial positioning and high rigidity for rotating worktables.
Aerospace Actuators: Ideal for compact flight control systems requiring lightweight, high-capacity thrust support.

Frequently Asked Questions

1. How does a four-point contact bearing replace a double-row bearing?
Because it is designed to handle axial loads from both directions within a single row of balls, it can often replace a double-row angular contact bearing, saving significant axial space.
2. Why is the inner ring split?
The split inner ring allows for the insertion of a larger number of balls, which increases the load-carrying capacity. It also makes the bearing easier to mount on the shaft.
3. Can these bearings handle pure radial loads?
While they can handle moderate radial loads, they are primarily designed for applications dominated by axial thrust. Under pure radial load, the four-point contact can increase friction; therefore, a minimum axial load is usually recommended.
4. What is the benefit of the “Gothic Arch” raceway?
The arch ensures that the balls only contact the four points under specific load conditions, providing higher axial capacity and better control over internal clearance than standard circular raceways.
5. Are these bearings suitable for high-speed operation?
They are capable of high speeds, but because of the increased friction inherent in four contact points, they are generally rated for slightly lower top speeds than standard deep-groove or single-row angular contact bearings.