SKFSuper Precision Angular Contact Ball Bearing – Straight Bore, 80 mm ID, 140 mm OD, 26 mm Width, Open, 15° Contact Angle, Universally Matchable, Extra Light Preload, ABEC 7

Product Description

What this part is

An SKF 7216 CD-GA/P4A super-precision single-row angular contact ball bearing. Bore 80 mm, outside diameter 140 mm, width 26 mm. Open on both faces, straight bore, one row of steel balls, machined phenolic cage riding on the outer ring land. Supplied as a universally matchable single bearing at extra light preload.

Decoding the designation

In SKF’s super-precision scheme 7216 gives the 72 series and an 80 mm bore. CD denotes a 15° contact angle, distinct from ACD at 25°. P4A is SKF’s super-precision tolerance class, equivalent to ABEC 7. DGA — universally matchable, extra light preload. The carton also carries the Fafnir designation 2MM216WI CR DUL: 2MM confirms the 15° angle and CR the phenolic outer-land-riding cage.

What these specs mean in practice

A 15° contact angle favours speed and radial rigidity; a 25° ACD bearing in the same envelope carries more thrust and less speed. Extra light preload gives low running friction and heat generation while still eliminating clearance, which suits high-speed spindle work where thermal growth is the limiting factor. The machined phenolic cage is light, self-lubricating and tolerant of high speed, and is rated to about 120 °C.

Universal matchability

A universally matchable bearing has its ring faces ground so that any two or more of the same designation can be mounted together in back-to-back, face-to-face or tandem sets, and the specified preload is produced automatically when the faces are clamped. The DGA code fixes the preload magnitude of that set. It does not specify a mounting direction, which is a design decision at the spindle.

Quantity and configuration

One bearing, 1 Pc.

Fitting notes

Published operating range is −30 °C to 120 °C, with oil or grease lubrication. Preloaded bearings carry no internal clearance specification. Ring faces are the preload reference surfaces, so they are clamped square against the shoulder.

Interchange guidance

Same 15° angle, phenolic cage and universal matching: FAG B7216-C-T-P4S-UL and Timken/Fafnir 2MM216WI SUL. The 7216 CD-GB/P4A is a heavier preload grade and the 7216 ACD/P4A is a 25° bearing, so neither is a substitution.