GMNS61912CTAA7Super Precision Angular Contact Spindle Bearing 60x85x13 mm, 15° Contact Angle, Phenolic Cage, ABEC 7, Thin Section

Product Description

What this part is

A GMN S61912C super-precision angular contact spindle bearing, 60 mm bore x 85 mm outside diameter x 13 mm wide — the 71912 / 7912 thin-section spindle envelope. GMN builds high-speed spindle bearings almost exclusively, and the S-series is its high-speed angular contact range: the number carries a deep-groove-style 61912 base, but the raceway geometry is angular contact, so it takes radial load plus thrust in one direction and the high shoulder must face the thrust.

Decoding the designation

S – GMN high-speed spindle bearing series.
61912 – the thin-section 19-series envelope, 60 x 85 x 13 mm.
C – contact angle 15°.
TA – fabric-laminate (phenolic) cage.
A7 – precision class ABEC 7.

What these specs mean in practice

15° is the high-speed end of the contact-angle range. The shallow angle keeps the ball load path closer to radial, so centrifugal ball loading and heat generation stay low and the bearing tolerates a higher DN value than a 25° or 40° equivalent. What you give up is thrust capacity and axial stiffness — which is exactly the right trade for a grinding spindle or a high-speed milling head, and the wrong one for a thrust-dominant boring position.

A 13 mm width on a 60 mm bore makes this a thin-section bearing, chosen where spindle length is at a premium and several bearings must be stacked in a short nose. ABEC 7 controls bore, outside diameter, width and above all radial and axial runout, so the ring can be fitted in any rotational orientation without hunting a high spot. The fabric-laminate phenolic cage is the standard high-speed choice: light, self-lubricating, quiet, and soft enough that a ball skid polishes the pocket instead of galling it. Keep it below roughly 120 °C sustained and check your lubricant, since some synthetics and solvents attack the resin.

Published dimensions

Bore (d): 60 mm
Outside diameter (D): 85 mm
Width (B): 13 mm
Contact angle: 15°
Rows: 1
Cage: fabric-laminate phenolic (TA)
Precision: ABEC 7
Closure: open, no seals or shields

Quantity and configuration

Sold as one bearing. This is a single, not a factory-matched duplex set, so no set preload is supplied with a partner. Where a spindle drawing calls for a matched pair to a named preload class, order a GMN duplex set rather than pairing two singles.

Fitting notes

Orient the high shoulder towards the thrust load. Press or heat onto the shaft against the inner ring only — never hammer an ABEC 7 bearing and never drive force through a phenolic cage. Grease sparingly, roughly a quarter to a third fill, or use the oil-air or oil-mist system the spindle was designed around. A single angular contact locates the shaft one way only and needs an opposing bearing in the arrangement. Note the condition remark on this listing: the original grease has dried, so the bearing should be cleaned and relubricated with the correct spindle grease before it is run.

Interchange guidance

Direct 60 x 85 x 13 mm super-precision 15° equivalents: NSK 7912CTYNSULP4 and 71912CTYNP4 (NSK C = 15°), SKF 71912 CD/P4A (SKF CD = 15°), FAG B71912-C-T-P4S (FAG C = 15°), NTN 7912CT1P4 (NTN C = 15°), Fafnir/Timken 2MM9112WICR (2MM = 15°). Carried as dimensionally-correct cross-references with the difference named: SKF 71912 ACD/P4A, NSK 7912A5TYNP4 and Fafnir 3MM9112WI are the same envelope at 25° — same bore and housing, more thrust capacity, less speed. Match the contact angle your spindle was designed around before substituting.