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
55 mm x 120 mm x 29 mm NTN 7311BGC3 Single row or matched pairs of angular contact ball bearings	2.06 in	22000 lb	3360 RPM	1.7500 in
55 mm x 120 mm x 29 mm NTN 7311BL1G Single row or matched pairs of angular contact ball bearings	22218 E	60.325 mm	149.1 N·m	41.8 kN
140,000 mm x 250,000 mm x 42,000 mm SNR 7228BGM Single row or matched pairs of angular contact ball bearings	1200	2400	0.02 KGS	240mm
130,000 mm x 230,000 mm x 40,000 mm SNR 7226BGM Single row or matched pairs of angular contact ball bearings	.5000 in	Max 250°	6.5000 in	1.2500 in
120 mm x 215 mm x 40 mm SNR 7224.BG.M Single row or matched pairs of angular contact ball bearings	4.8350 in	674400 lbf	3.7190 in	Open
55,000 mm x 120,000 mm x 29,000 mm NTN 7311BG Single row or matched pairs of angular contact ball bearings	C3	Uncoated	2 mm	Not Rated
55 mm x 120 mm x 29 mm SNR 7311.BA Single row or matched pairs of angular contact ball bearings	0.02 KGS	In Stock	Open Type	1010
55 mm x 120 mm x 29 mm SNR 7311.BG.M Single row or matched pairs of angular contact ball bearings	16.75mm	Steel	np238750/np929800-ti	45mm
50 mm x 110 mm x 27 mm NTN 7310BL1G Single row or matched pairs of angular contact ball bearings	1870	22334-e1-k-c2-fag	360mm	1350
55 mm x 120 mm x 29 mm SNR 7311.BGA Single row or matched pairs of angular contact ball bearings	50000	1200 (sfm)	SAE 841, CT-1000-K26	Oilite®, Synthet
55 mm x 120 mm x 29 mm NTN 7311B Single row or matched pairs of angular contact ball bearings	1-1/4 in	3 in	2-1/16 in	1.2500 in
55 mm x 120 mm x 29 mm NTN 7311 Single row or matched pairs of angular contact ball bearings	55 mm x 120 mm x 29 mm	-	-	-