Single row or matched pairs of angular contact ball bearings

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Matched Pair 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 Back, Face 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 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.

Bearing Number	Bore Dia	Outer DIa	Width	Size
70 mm x 125 mm x 24 mm SNR 7214.BG.M Single row or matched pairs of angular contact ball bearings	40mm	1208j-qbl	Open Type	Standard
70 mm x 125 mm x 24 mm NTN 7214B Single row or matched pairs of angular contact ball bearings	Cast Iron	Labyrinth	4.44 in	066279
70 mm x 125 mm x 24 mm NTN 7214 Single row or matched pairs of angular contact ball bearings	21 mm	55 mm	C0	Open
70 mm x 125 mm x 24 mm SNR 7214.BGA Single row or matched pairs of angular contact ball bearings	Plain Sleeve	-40 to +248 &de	70B	3.25 N/mm2 x m&
65 mm x 120 mm x 23 mm NTN 7213BL1G Single row or matched pairs of angular contact ball bearings	41800 lbf	C0	38700 lbf	150 mm