FAG3210-B-TNH-C3Double-Row Angular Contact Ball Bearing 50 x 90 x 30.2 mm, 25° Contact Angle, Thrust Both Directions, Polyamide Cage, C3

Product Description

What this part is

A FAG 3210-B-TNH-C3 double-row angular contact ball bearing, 50 mm bore, 90 mm outside diameter, 30.2 mm wide. Two ball rows run on opposed raceways inside a single pair of rings, at a 25° contact angle. Because the rows oppose each other, the bearing carries heavy radial load, thrust in both axial directions, and moment load, in one non-separable unit the width of a single wide bearing.

Decoding the designation

32 is the double-row angular contact ball bearing series, carried as 52 in the older FAG scheme, which is why 5210 appears on this listing as a legacy designation for the same part. 10 is the bore code, giving 50 mm at five millimetres per unit. B sets the contact angle at 25°. TNH is the glass-fibre reinforced polyamide cage. C3 is radial internal clearance greater than normal.

What these specs mean in practice

A double-row angular contact bearing does the work of two opposed single-row bearings without the assembly setting: the contact angles are ground into one pair of rings, so there is no shimming, no matched pair to keep together and no preload to establish in the housing. The 25° angle carries more thrust and less speed than a 15° bearing of the same size, and gives the bearing genuine moment stiffness. The trade against a matched pair is that the arrangement is fixed at manufacture, so the effective bearing spread is short and the preload cannot be tuned. C3 clearance suits an inner ring running hotter than its housing or a tight interference fit on the shaft. The polyamide cage runs quietly and tolerates shock, with a practical continuous ceiling of 120 °C.

Quantity and configuration

1 Pc. Complete non-separable bearing, open on both faces, no seals and no shields. No snap ring and no spacers.

Fitting notes

The bearing mounts as one unit with an interference fit on the shaft and a location fit in the housing, pressed against the ring being fitted rather than through the ball rows. Since it locates the shaft in both directions on its own, a second bearing on the same shaft is normally left free to float so the two do not fight each other over thermal growth.

Interchange guidance

The ISO base number is 3210, so another maker’s 3210 B TVH C3, 3210 ATN9/C3 or 5210 double-row angular contact ball bearing of the same 30.2 mm width and 25° angle is a genuine interchange. The 3210-BD-XL-2HRS-TVH is a related size, not a substitution, because it is sealed and has a different friction and speed limit. A pair of single-row 7210-B-TVP bearings covers the same duty only once mounted back-to-back and set, and a plain 3210-B-TNH without a clearance suffix is CN clearance.