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. Bore Diameter: 60 mm. Outside Diameter: 85 mm. Width: 13 mm. Contact Angle: 15°. Precision Class: ABEC 7. Cage Material: Phenolic (fabric laminate). Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Rolling Elements: Balls. 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.

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:

Contact Angle: 15°. This 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. Thrust capacity and axial stiffness are lower, which suits grinding spindles and high-speed milling heads.

A 13 mm width on a 60 mm bore makes this a thin-section bearing, used where spindle length is at a premium and several bearings are stacked in a short nose. Precision Class: ABEC 7, which controls bore, outside diameter, width and above all radial and axial runout. Cage Material: fabric-laminate phenolic, light, self-lubricating and quiet.

Mounting data:

Bore Diameter (d): 60 mm. Outside Diameter (D): 85 mm. Width (B): 13 mm. Rows: 1. Closure: open, no seals or shields. The high shoulder faces the thrust load, and a single angular contact bearing locates the shaft in one axial direction.

Quantity and configuration:

Unit Quantity: 1 Pc. A single bearing, not a factory-matched duplex set.

Interchange guidance:

Cross-Reference 1: SKF 71912 CD/P4A. Cross-Reference 2: FAG B71912-C-T-P4S. Cross-Reference 3: NSK 7912CTYNSULP4. Cross-Reference 4: Fafnir 2MM9312WICR. All four are 60 x 85 x 13 mm at a 15° contact angle.

Cross-Reference 5: SKF 71912 ACD/P4A, Cross-Reference 6: Fafnir 3MM9312WI and Cross-Reference 7: NSK 7912A5TYNP4 share the 60 x 85 x 13 mm envelope at a 25° contact angle, with more thrust capacity and lower speed than this 15° bearing.