I. Bearing Type Four-point contact ball bearing (single-row angular contact ball bearing), 35° contact angle; capable of supporting bidirectional axial loads and radial loads; solid brass cage.
II. Standard Dimensions Inner diameter d = 140 mm Outer diameter D = 250 mm Width B = 42 mm Minimum chamfer r = 3 mm
III. Key Structural Features 1. Split inner ring design with four-point contact between balls and raceways; a single bearing can support heavy axial thrust in both directions. 2. Requires less axial space compared to paired Angular Contact Ball Bearings (7-series) or double-row angular contact ball bearings. 3. High-strength solid brass cage (M-type), suitable for medium-to-high speeds and shock-load conditions. 4. Open design (unsealed); requires an external lubrication supply.
IV. Typical Applications 1. High-speed shafts in speed reducers and gearboxes (helical gears generate bidirectional axial forces) 2. Main shafts of air compressors, screw pumps, and compressors 3. Wind turbine gearboxes and mining/metallurgical equipment 4. Vehicle transmissions and heavy-duty construction machinery drive systems 5. Machine tool spindles and rotary tables
