Single row or matched pairs of angular contact ball bearings

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 Angular Contact Bearings, also called duplex bearings, are machined as matched sets.  The pairs are furnished with the race faces ground to provide preload when installed. To accomplish this, a gap is provided between the inner races or outer race of the pair.

There are three types duplex bearing arrangements commonly used and they are Back to BackFace to Face and Tandem bearing arrangement.
It is a type of duplex bearing arrangement where the two half are placed so that contact angle lines of the bearing diverge inwardly. And these contact angle lines form ‘O’ shape, hence called as “O arrangement”.
In back to back arrangement a gap is provided between inner races and when installed, this gap is closed and producing a preload on the bearings. DB arrangement has higher moment stiffness.
They can carry heavy radial loads, combined radial and thrust loads, reversing thrust load, moment loads.
It is a type of duplex bearing arrangement where the two half are placed so that contact angle lines of the bearing converge inwardly. And these contact angle lines form ‘X’ shape, hence called as “X arrangement”.
In face to face arrangement a gap is provided between outer races and when installed, this gap is closed and producing a preload on the bearings. DF arrangement has lower moment stiffness, so they must be spaced sufficiently to provide resistance to moment load.
They can carry heavy radial loads, combined radial and thrust loads, reversing thrust load.
It is a type of duplex bearing arrangement where the two half are placed so that contact angle lines are parallel. This arrangement makes a very heavy duty thrust bearing arrangement, but it will not carry any radial load and accepts thrust loading in only one direction.

Bearing Number Bore Dia Outer DIa Width Size
45,000 mm x 85,000 mm x 19,000 mm NTN 7209BG Single row or matched pairs of angular contact ball bearings 5.512 Inch | 140 Mil 31171531 8482.10.50.28 Ball Bearing
50 mm x 90 mm x 20 mm NTN 7210B Single row or matched pairs of angular contact ball bearings Steel 2.756 Inch | 70 Mill 1.6 0.0
45 mm x 85 mm x 19 mm NTN 7209BL1G Single row or matched pairs of angular contact ball bearings N/A No Pilot QM INDUSTRIES 8483.20.40.80
50 mm x 90 mm x 20 mm NTN 7210 Single row or matched pairs of angular contact ball bearings Flange Block 0 Inch | 0 Millimete Teflon Labyrinth Yes
45 mm x 85 mm x 19 mm SNR 7209.BA Single row or matched pairs of angular contact ball bearings SCHAEFFLER GROUP 0 B04336 FAG BEARING
45 mm x 85 mm x 19 mm NTN 7209B Single row or matched pairs of angular contact ball bearings Mounted Units & N/A 0782475721009 DODGE
40 mm x 80 mm x 18 mm NTN 7208BL1G Single row or matched pairs of angular contact ball bearings 2 Set Screw TIMKEN 2 Bolt Pillow Block
45 mm x 85 mm x 19 mm NTN 7209 Single row or matched pairs of angular contact ball bearings M06288 Cast Iron Double Row | Heavy C ZAT9
45 mm x 85 mm x 19 mm SNR 7209.BG.M Single row or matched pairs of angular contact ball bearings Steel 1.0626 2 Seals Deep Groove | NBR Se
45 mm x 85 mm x 19 mm SNR 7209.BGA Single row or matched pairs of angular contact ball bearings LM102910P-2 Inch Bearing 2.891 Inch | 73.431
35 mm x 72 mm x 17 mm NTN 7207BL1G Single row or matched pairs of angular contact ball bearings 2.077 Inch | 52.756 N/A 7.874 Inch | 200 Mil Assembly
40 mm x 80 mm x 18 mm NTN 7208 Single row or matched pairs of angular contact ball bearings M06288 DODGE Mounted Units & ABB MOTORS AND MECHA
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