FAGB7216CBTP4SULSuper Precision Angular Contact Ball Bearing 80x140x26mm 15 Degree P4S Phenolic Cage Light Preload Universally Ground

Product Description

What this part is

A single FAG B7216 super-precision angular contact ball bearing: 80 mm bore, 140 mm OD, 26 mm wide, 15° contact angle, phenolic cage, P4S tolerance class, universally ground for light preload. The B prefix is FAG’s spindle-bearing line — parts built specifically for machine tool spindles, grinding heads, high-speed rotary tables and precision gearboxes rather than for general industrial duty.

Decoding the designation

B — FAG super-precision spindle bearing series7216 — ISO angular contact envelope, light series, 80 x 140 x 26 mmC — 15° contact angleT — phenolic (fabric-laminate) cageP4S — FAG super-precision class: P4 dimensional tolerance with tightened running accuracyUL — universally ground, light preload

What these specs mean in practice

15° is the speed-biased end of the angular contact range: high radial capacity and a high speed ceiling, less thrust capacity and axial stiffness than a 25° bearing of the same size. Light preload keeps friction and heat generation low, which is what allows those speeds and gives long grease life. The phenolic cage is light, quiet and self-lubricating at speed but must be kept away from solvents, steam and sustained high temperature. P4S accuracy only reaches the workpiece if the shaft and housing seats are ground to a comparable class — fitted into an ordinary bore, a P4S bearing performs like a standard one.

Published specifications

Bore: 80 mmOutside diameter: 140 mmWidth: 26 mmContact angle: 15°Tolerance class: P4SPreload: light (UL)Cage: phenolicSeries: FAG B7200 spindle bearing, 7216 envelopeRows: singleClosure: open

Quantity and configuration

One bearing. Universally ground rings mean this bearing can be run on its own or combined with identical bearings back-to-back (DB), face-to-face (DF) or in tandem (DT), and the ground offsets will produce the intended light preload without a ground spacer. Order the number of pieces the spindle arrangement calls for.

Fitting notes

Handle by the rings, not the cage, and mount clean — a P4S bearing shows up every particle of contamination. Angular contact bearings are direction-sensitive: identify the high shoulder and orient it to face the thrust load. Use the machine builder’s shaft and housing tolerances; an over-tight bore fit raises the preload and the running temperature. Where several are stacked, mark the faces before any future removal so the arrangement can be reproduced. Lubricate sparingly with a spindle grease or an oil-air feed matched to the speed.

Interchange guidance

Direct equivalents are 7216-envelope 15° super-precision universally ground light-preload singles: FAG B7216-C-T-P4S-UL, the Fafnir 2MM216WI-CR-SUL and NSK 7216CTYSULP4. Related but NOT interchangeable: B7216-E-T-P4S-UL is the same envelope at 25°, UM and UO denote medium preload and universal with no preload, and a plain 7216 without the B prefix is a standard-class industrial bearing rather than a spindle bearing.