Fafnir2MM222WISULSuper Precision Angular Contact Ball Bearing 110x200x38 mm, 15° Contact Angle, Universally Ground Single, Light Preload, 1 Pc

Product Description

What this part is

A Fafnir super-precision angular contact ball bearing, part number 2MM222WI-SUL. Bore is 110 mm, outside diameter 200 mm and width 38 mm, giving an ISO 7222 envelope. Fafnir is the super-precision line of the Timken Company, and the WI family is its spindle-grade angular contact series.

Decoding the designation

The leading 2 of 2MM sets a 15° contact angle, where 3MM sets 25°. The MM prefix carries super-precision class P4S, ABEC 7 dimensionally with ABEC 9 running accuracy. The absence of a leading 9 in 222 places the bearing in the ISO 72 dimension series rather than the lighter 70 series, which is why the outside diameter is 200 mm on a 110 mm bore. WI is the super-precision angular contact family, SU a universally ground single and L light preload.

What these specs mean in practice

A 15° contact angle carries less thrust and permits higher speed than a 25° angle. A universally ground single reaches the specified preload when clamped against another universally ground bearing of the same designation, which is what allows spindle sets of two, three or four to be built from singles. Light preload removes internal clearance while keeping running torque and heat generation low. The 72 series cross-section gives greater load capacity than a 70 series bearing on the same bore, at a lower limiting speed.

Quantity and configuration

1 Pc. Single bearing, universally ground. No spacer rings, lock nut or housing are included.

Fitting notes

Universally ground rings reach the designed preload when clamped solid against the flush ground faces of a mating bearing of the same designation, without shimming, and the arrangement is set by which faces are brought together. Handling is by the outer ring on a clean surface.

Interchange guidance

Same-spec equivalents are the 7222 C P4 universally ground single forms: FAG B7222-C-T-P4S-UL, SKF 7222 CD/P4A and NSK 7222 CTR SUL P4. The carton also records the Barden 222-H and NDH Q20222 numbers for the same envelope. A 7222 AC or A5 variant is a related size at 25° or 30° and changes the thrust and speed balance, so it is not a substitution. 2MM222WI-SUM and 2MM222WI-SUH share the envelope and angle at higher preload, and 2MM222WI-DUL is the factory-matched pair.