Four Point Angular Contact Bearing with Compact Width

For design teams comparing thin-section options, this Four Point Angular Contact Bearing with Compact Width from KOMEL combines a pointed-arch raceway geometry with a constant square cross-section. As a China manufacturer working from a 12,000 square meter facility in Hefei, KOMEL controls grinding, heat treatment and inspection in-house. The raceways of both rings are shaped as pointed arch grooves, so the steel balls make four-point contact with the inner and outer rings in theory. This layout allows the bearing to carry radial loads, bidirectional axial loads and overturning moments while its width remains close to that of a single angular contact ball bearing set.

Structure

The inner and outer ring raceways are pointed arch grooves. Under load, the balls do not carry all four theoretical contact points at full capacity; two or three points usually take the main contact stress depending on load direction. This is why one Four Point Angular Contact Bearing with Compact Width can replace a back-to-back pair in space-limited joints, turntables and rotating frames.

1. Constant cross-section: within one series, wall thickness stays the same even when bore and outside diameter change.

2. Compact axial width: the bearing occupies less axial space than two angular contact bearings arranged back-to-back.

3. Combined load capability: radial, bidirectional axial and overturning moment loads can be handled in one mounting position.

Specifications

The tables below list the KAA, KA, KB, KC, KD, KF and KG series data, including bore, outside diameter, land diameters and weight in pounds.

Robot Joints

In industrial robots, this Four Point Angular Contact Bearing with Compact Width is often used at wrist, elbow and waist joints. The design target is low starting friction, enough tilting stiffness and controlled weight, because joint mass affects motion inertia. The thin axial width helps reduce the joint housing length while the four-point raceway carries combined loads in one position.

1. Wrist and elbow joints: compact axial space and bidirectional axial load support.

2. Waist and turntable axes: overturning moment capacity with a constant cross-section.

3. Collaborative robot arms: low friction and smooth low-speed rotation.

Medical and Optical

Medical imaging frames, such as CT scanner rotation sections, need stable low-speed motion and low vibration. The thin-section geometry of this Four Point Angular Contact Bearing with Compact Width helps keep torque variation small during slow rotation, which supports repeatable positioning. In optical instruments, the same structure fits focusing and zoom mechanisms where only a small cross-section is available and smooth micro-rotation matters more than maximum speed.

1. CT and imaging rotation frames: low vibration and stable low-speed rotation.

2. Surgical robot joints: compact mounting and precise angular positioning.

3. Telescope and microscope adjustment: small section height and low starting torque.

Manufacturing and Quality

KOMEL operates a 12,000 square meter production base in Hefei with CNC grinding machines, lathes, heat treatment and inspection equipment. Thin-section rings can distort during grinding if rigidity is low, so in-process inspection and grinding parameter control matter for wall thickness consistency. The company works under ISO9001 and ISO14001 management systems, covering thin-section ball bearing production and batch traceability.

1. In-house grinding and heat treatment for ring geometry control.

2. Inspection from incoming material to finished bearing.

3. Custom selection support for mounting interfaces, preload and clearance.

FAQ

Q: Do all four contact points carry full load at the same time?

A: No. The four points describe the raceway geometry. Under actual load, two or three contact points usually carry the main stress depending on radial load, axial load or overturning moment direction. Selection should check contact angle and clearance against the real load combination.

Q: Does the wall thickness change when bore size changes within one series?

A: No. Within one series, the cross-section between inner and outer diameter remains constant. Bore and outside diameter increase together, but the square section proportion stays the same, which helps series design and shared radial mounting logic.

Q: Can this bearing replace a back-to-back angular contact pair?

A: In some space-limited positions, yes. The four-point design can carry radial, bidirectional axial and overturning moment loads in one bearing, and its width is close to one angular contact bearing set. However, actual life and stiffness still need checking against load and speed.

Q: Is a custom clearance or non-standard size available?

A: KOMEL can review custom requests through its technical team. Grinding, heat treatment and inspection equipment support adjustment of raceway parameters and clearance within confirmed drawing and working condition limits.