they are also available flanged or plain. The flange is just another option given to the design engineer by the bearing manufacturer. A flange is an extension, or a lip, on the outer ring of the bearing, DINGGUANGHE-CUP Power Transmission Products F624-2RS Flanged Ball Bearing ABEC-1 Deep Groove Ball Bearing 4x13x5mm Miniature Flanged Ball Bearings RF-1340DD 10PCS Ball Bearings: Industrial & Scientific. Buy DINGGUANGHE-CUP Power Transmission Products F624-2RS Flanged Ball Bearing ABEC-1 Deep Groove Ball Bearing 4x13x5mm Miniature Flanged Ball Bearings RF-1340DD 10PCS Ball Bearings: Deep-Groove Ball Bearings - ✓ FREE DELIVERY possible on eligible purchases. Item: F624 RS Flanged Ball Bearing; Type: Deep Groove Ball Bearing 。 Surface Roughness: Ra 0.05; Material: 52100 Chrome Steel 。 Coatings: Chrome Steel/GCr15; Closures: 2 Sealed; Lubrication: Self Lubricated (Grease) 。 Dimensions: 4 x 13 x 5 mm; ID (inner diameter)/Bore: 4mm; OD (outer diameter): 13mm; Width/Height/thickness: 5mm 。 Quantity: 10 Bearings 。 Flanged Ball Bearing Types & Features。A flanged ball bearing is not truly a different type of bearing. Just as ball bearings are offered sealed or open. designed to aid the mounting and positioning of a bearing in a delicate or problematic application.。Item: F624 RS Flanged Ball Bearing 。Type: Deep Groove Ball Bearing。Surface Roughness: Ra 0.05。Material: 52100 Chrome Steel。Coatings: Chrome Steel/GCr15。Closures: 2 Sealed。Lubrication: Self Lubricated (Grease)。Dimensions: 4 x 13 x 5 mm。ID (inner diameter)/Bore: 4mm。OD (outer diameter): 13mm。Width/Height/thickness: 5mm。Quantity: 10 Bearings 。 。 。.