FAGB7219-C-TPA-P4S-ULSuper Precision Spindle Bearing – Straight Bore, 95 mm ID, 170 mm OD, 32 mm Width, Open, 15° Contact Angle, P4S, Universal Light Preload, Phenolic Cage.

Product Description

What this part is

FAG B7219-C-TPA-P4S-UL super-precision spindle bearing, a single-row angular contact ball bearing in the B72 heavy spindle series. Bore: 95 mm. Outside diameter: 170 mm. Width: 32 mm. Contact angle: 15°. Precision class: P4S. Open on both faces. Weight: 5.89 lb.

Decoding the designation

B72: spindle bearing series with large-diameter balls. C: 15° contact angle. TPA: machined fabric-base laminate phenolic window cage. P4S: super-precision tolerance class with matched dimensional grading. UL: universal light preload, so any two bearings of this designation form a correct set back-to-back, face-to-face or in tandem. The carton also carries K5, 2MM219, 219 and Q20219 as cross-designations.

What these specs mean in practice

Dynamic load rating: 130 kN (29,225 lbf). Static load rating: 81 kN (18,209 lbf). Limiting speed: 8,000 rpm. Maximum operating temperature: 100 °C. Minimum operating temperature: -30 °C. A 15° contact angle runs faster and carries less thrust than a 25° execution on the same envelope, which is what makes it the standard machine-tool spindle choice. The phenolic cage is light in mass, quiet at speed, and holds oil in its own surface, and it suits grease, oil-mist and oil-air lubrication.

Quantity and configuration

One bearing, in the universal light-preload execution. The ground ring faces establish the preload as soon as the rings are clamped, with no spacer grinding, and a second bearing of the same designation completes a matched set.

Fitting notes

Shaft seat to h5 and housing bore to H6 or closer hold the P4S running accuracy. Clamping loads are applied evenly across the ring faces so the ground offsets set the preload.

Interchange guidance

Same-specification 15° light-preload executions: SKF 7219 CD/P4ADGA, NSK 7219CTYNSULP4, RHP 7219CTRSULP4, Fafnir 2MM219WI-SUL. Related size: B7219-E-T-P4S-UL (25° contact angle, same envelope, more thrust and less speed). Punctuation variants: B7219C.TPA.P4S.UL, B7219-C-TPA-P4S-UL, B 7219 C TPA P4 UL, B7219CTPAP4K5UL.