FAGHCS71911-E-T-P4S-N16-DTLHigh Speed Hybrid Ceramic Angular Contact Spindle Bearing Set – 55 mm ID, 80 mm OD, 13 mm Width, Sealed, 25° Contact Angle, Light Preload Tandem Pair, P4S

Product Description

What this part is

FAG HCS71911-E-T-P4S-N16-DTL high-speed hybrid spindle bearing set. Series: HCS719. Bore: 55 mm. Outside Diameter: 80 mm. Width: 13 mm per bearing. Single row each, sealed both sides, straight bore. Country of origin: Germany.

Decoding the designation

HC marks a hybrid execution: silicon nitride ceramic balls running on steel rings. S marks the sealed execution. 719 is the extra-light dimension series. E sets the Contact Angle at 25°. T denotes a machined fabric-base laminate phenolic cage. P4S is the tolerance class, held tighter than P4 to ISO 492. DTL sets a duplex tandem arrangement at light preload.

What these specs mean in practice

Ceramic balls weigh around 40 percent of steel and carry a higher elastic modulus, which cuts centrifugal loading on the outer raceway and lets this section run to 28,000 rpm on grease. Ratings per bearing: Dynamic Load Rating 12.3 kN, Static Load Rating 7.7 kN, Fatigue Load Limit 620 N. Axial rigidity per bearing at light preload: 93 N per micrometre. Preload force per bearing: 51 N. The seals are non-contact lip seals and the bearings are greased for life, which sets the maximum operating temperature at 80 °C.

Quantity and configuration

Two bearings, supplied as a matched tandem set. In tandem both contact angles point the same way, so the pair shares thrust in one direction and carries substantially more of it than a single bearing. Stacked width across the pair: 26 mm. Preload is ground into the rings, so this set carries a preload class in place of a running clearance.

Fitting notes

Shaft shoulder diameter: 60 mm to h12. Housing shoulder diameter: 75.5 mm to H12. Maximum recess radius: 0.6 mm on the shaft, 0.3 mm on the housing side. Minimum chamfer dimension: 1 mm. Distance between the pressure cone apexes: 22.2 mm. Operating temperature range: -30 °C to 80 °C.

Interchange guidance

The single-bearing form of this execution is HCS71911-E-T-P4S-UL. Searchable variants: HCS71911ETP4SN16-DTL, HCS71911-E-T-P4S, HCS71911, 71911. The all-steel-ball equivalent on the same envelope is HS71911-E-T-P4S, a related size: the ball material changes the speed rating and the load figures, so it is not a like-for-like substitution.