FAGSuper-Precision Angular Contact Ball Bearing 60 x 110 x 22 mm, 25° Contact Angle, ABEC 7/9, Phenolic Cage, Universal Light Preload

Product Description

What this part is

FAG B7212-E-T-P4S-UL, a super-precision angular contact ball bearing for machine-tool spindles. Bore: 60 mm. Outside Diameter: 110 mm. Width: 22 mm. Contact Angle: 25°. Precision Class: P4S. Cage Material: laminated fabric phenolic. Cage Type: machined, laminated fabric. Number Of Rows: 1. Rolling Elements: steel balls. Closure Type: open. Preload: light (UL). A single-row angular contact bearing carries thrust in one direction and takes its radial load through the same contact ellipse.

Decoding the designation

B7 — FAG super-precision spindle bearing series.

2 and 12 — dimension series and bore code, giving a 60 mm bore.

E — 25° contact angle. A C in that position is 15°.

T — fabric-base laminate phenolic cage.

P4S — FAG tolerance class P4S, tighter than P4 to ISO 492:2023, equivalent to ABEC 7 dimensional with ABEC 9 running accuracy.

UL — universally matchable, light preload.

Published performance data

Dynamic Load Rating (Cr): 53,000 N (53 kN), per bearing.

Static Load Rating (C0r): 29,500 N (29.5 kN), per bearing.

Fatigue Load Limit (Cur): 3,150 N.

Limiting Speed, grease lubrication: 12,000 rpm.

Limiting Speed, oil lubrication: 19,000 rpm.

Mass: 0.779 kg (1.72 lb).

Operating Temperature: -30 °C to 100 °C.

Preload Force, light: 463 N. Medium: 1,586 N. Heavy: 3,304 N.

Axial Rigidity, light preload: 165 N/µm. Medium: 264 N/µm. Heavy: 358 N/µm.

Lift-off Force, light preload: 1,351 N. Medium: 4,794 N. Heavy: 10,334 N.

Mounting data

Shaft Shoulder Diameter da: 69.5 mm, tolerance h12.

Outer Ring Shoulder Diameter Da: 101.5 mm, tolerance H12.

Maximum Recess Radius ra max: 1.5 mm. ra1 max: 0.6 mm.

Minimum Chamfer Dimension r min: 1.5 mm. r1 min: 1.5 mm.

Distance Between The Apexes Of The Pressure Cones (a): 30.9 mm.

Injection Pitch Diameter Etk: 77 mm minimum to 81.9 mm maximum.

Shaft and housing seats are ground to the tolerance class matching P4S, since bore and housing form error transfers directly into spindle runout at this accuracy level.

What these specs mean in practice

The 25° contact angle carries more thrust and less speed than a 15° bearing of the same size, and gives greater axial stiffness for a given preload. That suits a spindle seeing heavy cutting thrust rather than maximum surface speed.

Light preload keeps heat generation and power draw down at 165 N/µm of axial rigidity. Medium and heavy raise rigidity to 264 and 358 N/µm.

The phenolic cage is light, self-lubricating and quiet, and suits high speed with oil-air or grease lubrication.

Arrangement and matching

The UL universal design grinds the ring faces so that any two bearings of this designation come together at light preload in a back-to-back (DB), face-to-face (DF) or tandem (DT) stack without spacers or shims. DB gives the widest effective bearing spread and the greatest resistance to moment load, DF is more tolerant of misalignment, and DT doubles thrust capacity in one direction.

Quantity and configuration

Unit Quantity: 1 Pc. Single bearing, open both faces.

Interchange guidance

The genuine interchange is another maker’s 25° super-precision 60 x 110 x 22 mm spindle bearing at ABEC 7/9 with light universal preload: NSK 7212A5TRDULP4, SKF 7212 ACD/P4A DGA, or the FAG XCB7212-E-T-P4S-UL higher-speed execution. The 7212ACD carried on this listing as an alternate designation is standard-precision 25° angular contact and is a related size. B7212-C-T-P4S-UL changes the angle to 15°, and B7212-E-T-P4S-UM changes the preload to medium.