FAGB7012CBTP4SDUMMatched Pair Super-Precision Spindle Bearings, 60x95x18 mm Each, 15° Contact Angle, Medium Preload, P4S, Phenolic Cage

Product Description

What this part is

A duplex, universally ground matched pair of FAG super-precision spindle bearings, 60 mm bore by 95 mm outside diameter by 18 mm wide per bearing. The B-prefix range is FAG’s dedicated high-speed spindle family, not an ordinary 7000-series angular contact bearing.

Decoding the designation

B7012 — FAG spindle bearing, 70 dimension series, 60 mm bore
C — 15° contact angle in FAG’s spindle-bearing scheme (E would be 25°)
B — spindle-bearing execution
T — machined fabric-reinforced phenolic cage
P4S — FAG super-precision class, tighter running accuracy than plain P4
DUM — duplex, universally ground, medium preload; mountable DF, DB or DT without shimming

The carton number 2MM9112WI DUM corroborates the angle from a second scheme: in Fafnir/Timken world numbering a 2MM prefix means 15°, and the MM prefix implies P4S accuracy. Both schemes agree.

Correcting the source data

The source copy asserted manufacture in the United States. No origin marking is documented, so no country of origin is claimed here. Order-now copy and shipping promises have been removed.

What these specs mean in practice

15° is the speed-favouring angle: low friction, low heat, high radial stiffness, modest axial capacity. Medium preload sits between the light grade used in grinding heads and the heavy grade used for roughing — more axial stiffness and better positional hold than DUL, at some cost in top speed and running temperature. Preload grades must never be mixed inside one arrangement; a DUM and a DUL bearing side by side will not share load as designed. The phenolic cage is the enabler for high rpm and tolerates a brief lubricant interruption, but it caps operating temperature.

Published ratings and mounting data

No FAG-published basic dynamic or static load rating could be verified for this exact designation, so none is stated rather than borrowed from the 25° B7012-E variant, whose ratings differ. Boundary dimensions 60 x 95 x 18 mm per bearing are confirmed; a mounted pair stacks to 36 mm.

Quantity and configuration

Sold as matched pairs of two bearings. Stock is recorded as 2, and on this record that is understood to be pairs rather than individual bearings — ask us to confirm the shelf count before ordering if you need an exact piece quantity. Never split a universally ground pair: the preload only exists as the set.

Cross-references

15° medium-preload cross-references: Fafnir/Timken 2MM9112WI DUM (this carton’s number) and NSK 7012CTYNDUMP4. SKF 7012 CD/P4A is the SKF form of the size; specify the matching preload class. Watch the angle letters — NSK’s A5 is 25° and its plain A is 30°, so 7012A5 and 7012A are related sizes at a different angle.