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Flange-mount ball bearing have a smaller contact surface with the bearing raceway which reduces friction. Low friction allows ball bearings to run higher speeds but with a lower load capacity than roller bearings.
 
Flange Bearing 4-bolt UCF204-20 mm #43434
Product Details:
Housing Material = Cast Iron
Housing Material Finish = Painted
Bearing Insert Material = Alloy Steel
Bearing Material Grade = 52100
Shaft Locking Type = Set Screws
Bearing Insert Type = Radial Ball
Number of Mount Holes = 4
Specs:
Material = Cast Iron/ Alloy Steel.
A = 84.7 mm
B = 84.7 mm
C = 12 mm, hole diameter (x4)
D = M6 – 1.0 (x2)
E = 10 mm
F = 10 mm
G = 20 mm
 
Flange Bearing 4-bolt UCF203-20 mm #43441
Product Details:
Housing Material = Cast Iron
Housing Material Finish = Painted
Bearing Insert Material = Alloy Steel
Shaft Locking Type = Set Screws
Bearing Insert Type = Radial Ball
Number of Mount Holes = 4
Standard duty square flange unit, set screw locking
Wide inner ring bearing
Dual heavy-duty slinger type contact seals
Anti-Rotation device
Specs:
Material = Cast Iron/ Alloy Steel.
A = 76 mm
B = 76 mm
C = 12 mm, hole diameter (x4)
D = M6 – 1.0 (x2)
E = 13.5 mm
F =  12.5 mm
G = 17 mm