FAGB71908CTPAP4AULSuper Precision Angular Contact Spindle Bearing – 40 mm Bore, 62 mm OD, 12 mm Width, 15° Contact Angle, ABEC 7 / P4, Light Preload

Product Description

What this part is

FAG B71908C.TPA.P4.UL super-precision angular contact spindle bearing. Bore Diameter: 40 mm. Outside Diameter: 62 mm. Overall Width: 12 mm. Contact Angle: 15°. Dynamic Load Rating: 18,000 N. Static Load Rating: 9,900 N. Limiting Speed: 24,000 rpm grease; 36,000 rpm oil. Precision Class: ABEC 7 / P4. Cage Material: Phenolic. Cage Type: Machined. Preload: Light. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Lubricant: grease or oil. Item Weight: 0.109 kg (0.24 lb). Bearing Material: Chrome steel. Unit Quantity: 1 Pc. Series: B719. Base Number: B71908.

Decoding the designation

B719 — FAG spindle bearing, extra-light 19 dimension series. The thin section is what allows a 40 mm bore inside a 62 mm housing.

08 — bore code. Bore Diameter: 40 mm.

C — 15° contact angle. On the FAG B-series the alternative is E at 25°.

TPA — fabric-base laminate phenolic cage, machined. Phenolic runs light and quiet at spindle speed and holds lubricant in the fabric matrix.

P4 — tolerance class P4, equivalent to ABEC 7.

UL — universally matchable, light preload. Any two bearings from this designation can be set back-to-back, face-to-face or in tandem and will come up to the published preload without shims or grinding.

What these specs mean in practice

Limiting Speed: 24,000 rpm grease; 36,000 rpm oil. The extra-light 19 section runs a small ball complement on a large pitch circle, which is what makes those speeds available at a 40 mm bore.

Contact Angle: 15°. The shallow angle puts the load line near the radial plane, favouring speed and radial stiffness over thrust capacity.

Dynamic Load Rating: 18,000 N. Static Load Rating: 9,900 N. Fatigue load limit: 1,040 N. Distance between the apexes of the pressure cones: 12.8 mm.

Preload: Light. Preload force 84 N, lift-off force 259 N, axial rigidity 41 N/µm. The medium and heavy classes of the same bearing run 292 N and 594 N preload at 72 and 103 N/µm.

Operating temperature range: −30 °C to 100 °C.

Mounting data

Shaft shoulder diameter: 45 mm, tolerance h12. Outer ring shoulder diameter: 58.5 mm, tolerance H12. Maximum recess radius: 0.6 mm on the inner ring face, 0.15 mm on the outer. Minimum chamfer dimension: 0.6 mm. Oil injection pitch diameter: 47.3 mm minimum to 49.1 mm maximum.

Quantity and configuration

Unit Quantity: 1 Pc. One universally matchable single bearing, open on both faces.

Interchange guidance

The cross-references below share the 40 x 62 x 12 mm envelope, the 15° contact angle and the P4 class, and are direct substitutions in a universally matchable light-preload execution. Designation variants: B71908C.TPA.P4.UL, B71908C.TPA.P4A.UL, B-71908-C-TPA-P4A-UL, B71908CTPAP4UL, B71908C.T.P4S.UL, B71908-C-T-P4S-UL, 7908-C, 71908C.