FAGB7011CTPAP4K5ULSuper Precision Angular Contact Ball Bearing – 55 mm ID, 90 mm OD, 18 mm Width, 15 Degree Contact Angle, Phenolic Cage, Light Preload, Universally Ground

Product Description

What this part is

A FAG super-precision single-row angular contact ball bearing, 55 mm bore by 90 mm outside diameter by 18 mm wide. Bearings in the Schaeffler B7 block are spindle bearings: ground to super-precision running accuracy, cage and internal geometry chosen for speed, and supplied universally ground so any two can be set back-to-back, face-to-face or in tandem without shims.

Decoding the designation

B7011C.TPA.P4S.UL breaks down as follows. B7 is the super-precision spindle bearing series and 011 the ISO 70-series size, giving the 55 x 90 x 18 mm envelope. C is a 15° contact angle. TPA is a textile-laminated phenolic cage. P4S is the running-accuracy class, tighter than P4 on radial and axial runout. UL is universal grinding with light preload built into the ring faces.

What these specs mean in practice

A 15° contact angle sets the balance between speed and thrust. It carries less axial load than a 25° or 40° bearing of the same envelope and runs faster and cooler, which is why it is the standard machine-tool spindle angle for high-rpm work. The phenolic cage is light and self-lubricating and rides quietly at speed, with a working ceiling around 120 °C. Light preload holds the balls in defined contact for stiffness and low runout while keeping frictional heat down.

Quantity and configuration

1 Pc. Single bearing, universally ground, open on both faces. No shims, spacers, locknuts or mating bearing.

Interchange guidance

The same-spec equivalents are SKF 7011 CDGA/P4A, NSK 7011CTRSULP4 and Timken/Fafnir 2MM9111WI CR SUL. Those are true substitutions at 15°, phenolic cage, light preload. A 7011 with no angle letter, an A or an E suffix, or a steel or polyamide cage is a related size at the same envelope rather than an interchange, because contact angle and cage both change the speed and thrust ratings.