7408BM is a single-row angular contact ball bearing with the following core parameters: inner diameter 40mm × outer diameter 110mm × width 27mm, contact angle 40°, machined brass cage, and basic rated dynamic load 70.2kN and static load 45kN. Main Dimensions and Specifications
Inner Diameter (d): 40 mm
Outer Diameter (D): 110 mm
Width (B): 27 mm
Weight: Approx. 1.4 kg
Contact Angle: 40° (Suffix "B" indicates rolling element guidance)
Cage: Machined brass (Suffix "M" indicates rolling element guidance)
Chamfer Radius: Minimum 1.5–2.0 mm
Load and Speed Performance
Basic Rated Dynamic Load (C): 70.2 kN
Basic Rated Static Load (C₀): 45 kN
Fatigue Load Limit (Pu): 1.9 kN
Reference Speed: 8000 r/min
Limiting Speed: Approx. 11000 r/min r/min (can be higher under oil lubrication conditions, depending on the lubrication method)
Model Analysis and Application Characteristics
Model Structure: "7" represents angular contact ball bearing, "408" represents the size series and inner diameter code, "B" indicates a 40° contact angle, and "M" indicates a machined brass cage.
Force Characteristics: Can withstand radial loads and unidirectional axial loads simultaneously; single-row designs require paired installation (back-to-back/face-to-face) to withstand bidirectional axial forces or overturning moments.
Typical Applications: Machine tool spindles, high-speed motors, steam turbines, automotive differentials, and other high-speed applications requiring high axial rigidity.
