FAGB7206-C-TPA-P4S-ULSuper-Precision Angular Contact Ball Bearing 30 x 62 x 16 mm, 15° Contact Angle, ABEC 7/9, Polyamide Cage, Universal Light Preload

Product Description

What this part is:

A FAG B7206-C-TPA-P4S-UL super-precision angular contact ball bearing, 30 mm bore, 62 mm outside diameter, 16 mm wide. This is a machine-tool spindle bearing: raceways ground to super-precision running accuracy, a 15° contact angle, and ring faces prepared so the bearing can be stacked in matched sets. A single-row angular contact bearing carries thrust in one direction only, taking that thrust and its radial load through the same contact ellipse.

Decoding the designation:

B7 is the FAG super-precision spindle bearing series. 2 and 06 give the ISO 72 medium dimension series and the bore code, 30 mm at five millimetres per unit. C sets the contact angle at 15°; an E in that position would be 25°. TPA is the glass-fibre reinforced polyamide cage. P4S is dimensional accuracy to ABEC 7 with ABEC 9 running accuracy, a tighter class than plain P4. UL is the universal design at light preload.

What these specs mean in practice:

A 15° contact angle runs faster and carries less thrust than a 25° bearing of the same size, because the shallower angle puts less of the ball load into the axial direction and generates less heat from ball spin at speed. The P4S class is where the money goes: dimensional tolerance to ABEC 7 with running accuracy held to ABEC 9, so the bearing’s own radial and axial runout, rather than the shaft, sets the achievable spindle runout. Light preload keeps heat generation and power draw down at the cost of some axial rigidity. The polyamide cage is light and quiet, tolerates shock and momentary lubricant starvation, and has a practical continuous ceiling of 120 °C.

Arrangement and matching:

The UL universal design means the ring faces are ground so 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 with no spacers or shims. DB gives the widest effective bearing spread and the best resistance to moment load, DF tolerates more misalignment, and DT doubles thrust capacity in one direction only.

Quantity and configuration:

1 Pc. Bearing only, open both faces, no seals or shields. Supplied without spacers, without a locknut and without a preload sleeve.

Fitting notes:

Super-precision spindle bearings are mounted clean, with the marked ring faces oriented to the intended arrangement, and pressed by an even axial force on the ring being fitted rather than through the balls. Shaft and housing seats want to be ground to a tolerance matching P4S, since seat form error transfers directly into spindle runout at this accuracy level.

Interchange guidance:

The genuine interchange is another maker’s 15° super-precision 30 x 62 x 16 spindle bearing at ABEC 7/9 with universal light preload: Timken Fafnir 2MM206WI CR DUL, where the 2MM prefix denotes the 15° angle and implies the P4S class; NSK 7206A5TRDULP4; or SKF 7206 CD/P4A. B7206-E-TPA-P4S-UL is a related size, not a substitution, because its 25° angle changes the thrust and speed balance, and B7206-C-TPA-P4S-UM changes the preload to medium. A standard-precision 7206C is a different class of part.