SKF7212CDP4ADGBSuper-Precision Angular Contact Ball Bearing, 60x110x22 mm, 15° Contact Angle, Moderate Preload, Universally Matchable, P4A

Product Description

What this part is

A single-row SKF super-precision angular contact ball bearing in the 72 dimension series, 60 mm bore by 110 mm outside diameter by 22 mm wide, ground for universal matching at moderate preload.

Decoding the designation

7212 — angular contact ball bearing, 72 series, 60 mm bore
CD — 15° contact angle, super-precision internal design
GB — universally matchable, moderate preload when combined into a set. SKF’s ladder runs GA light, GB moderate, GC heavy
P4A — SKF super-precision class: P4 dimensional tolerance with P4A running accuracy

Correcting the source data

The record claimed Italian manufacture. No origin marking is documented for the item in hand and SKF builds super-precision bearings in several countries, so no country of origin is claimed. The description itself was eBay boilerplate with no product content — dead store link, shipping and carrier promises — and has been replaced.

What these specs mean in practice

The 15° contact angle is the speed-favouring choice: high radial stiffness, low friction, low heat, modest axial capacity. Moderate preload is the sensible middle setting — noticeably more axial rigidity and better positional hold than a GA light set, without the heat and speed penalty of a GC heavy one. It suits general machine-tool spindles where the cut is neither pure high-speed finishing nor heavy roughing.

The one rule that matters: preload classes cannot be mixed inside an arrangement. Two GB bearings mounted back-to-back give you the moderate preload SKF ground them for. A GB paired with a GA gives you an arrangement with no defined preload at all, which is how spindles end up either running hot or chattering.

Published ratings and mounting data

No SKF-published basic dynamic or static load rating could be verified for this exact CD/GB/P4A designation, so none is stated rather than borrowed from a differently preloaded or differently angled 7212. Boundary dimensions 60 x 110 x 22 mm are the ISO 72-series values and are confirmed.

Quantity and configuration

One single bearing. Being universally matchable it can be combined with an identical GB bearing to form a moderate-preload DF, DB or DT set, but only one bearing is included at this quantity.

Interchange guidance

Same-envelope 15° equivalents at moderate preload: NSK 7212CTYNDUMP4, NTN 7212CGD2GMP4, FAG B7212-C-T-P4S-DUM and Fafnir/Timken 2MM212WI DUM. Legacy MRC and SNFA precision numbers for this size route to SKF. Confirm the angle letter in each maker’s own scheme before substituting — SKF’s AC is 25°, NSK’s A5 is 25° and NSK’s plain A is 30°, none of which is a match for this bearing.