Fafnir2MMV211WIULAngular Contact Ball Bearing – 55 mm ID, 100 mm OD, 21 mm Width, Open, 15°, Light Preload, ABEC 9 Universal Single

Product Description

What this part is

Fafnir 2MMV211WI-SUL super-precision angular contact ball bearing, one universally ground single bearing. Bore 55 mm, outside diameter 100 mm, width 21 mm. ISO equivalent size 7211. Fafnir is a Timken brand.

Decoding the designation

The 2MM prefix gives a 15° contact angle. The V marks the MMV grade, built to ISO P2, equivalent to ABEC 9. 211 is the ISO 200-series size, so 7211. WI is the super-precision angular contact execution. SUL is a single universally ground bearing at light preload. The carton also carries 7211-C P2, where C is the 15° angle code.

What these specs mean in practice

ABEC 9 is the tightest commonly stocked precision grade, holding bore, outside diameter and running accuracy closer than the ABEC 7 and ABEC 7/9 grades in the same family. The 15° contact angle favours speed and radial stiffness, supporting a 22,400 rpm limiting speed. Dynamic capacity is 56 kN and static capacity 44 kN. The phenolic cage runs light and suits oil and light grease lubrication.

Quantity and configuration

One bearing. Universal grinding means single bearings of this designation can be stacked into duplex, triplex or quad sets in any arrangement, with light preload established as the ground faces are clamped together.

Preload and clearance

Light preload, ground into the ring faces. A universally ground preloaded bearing has no operating radial internal clearance, so clearance classes such as CN do not apply.

Fitting notes

The outer ring carries a V mark across the outside diameter, used to orient the bearing when several are stacked. Shaft and housing seats are held to precision tolerances matching the ABEC 9 grade.

Interchange guidance

FAG B7211-C-T-P4S-UL is the same size, angle, cage and arrangement one precision grade down, so it is a related grade rather than a straight substitution for a P2 part. NSK 7211CTRSULP3 matches size, angle and universal single arrangement. 2MM211WI-SUL is the same bearing at ABEC 7/9 rather than ABEC 9. 3MMV211WI-SUL is the same envelope and grade at a 25° contact angle.