FAGB71936ETPAP4K5ULSpindle Bearing — Super-Precision P4S, 180 mm ID, 250 mm OD, 33 mm Width, 25° Contact Angle, Phenolic Cage, Light Preload

Product Description

What this part is

FAG B71936-E-T-P4S-UL super-precision single-row angular contact spindle bearing. Bore Diameter: 180 mm. Outside Diameter: 250 mm. Overall Width: 33 mm. Contact Angle: 25°. Precision Class: P4S. Preload: Light. Number Of Rows: 1. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic (laminated fabric). Bearing Material: Bearing steel. Item Weight: 4.065 kg (8.96 lb).

Decoding the designation

B719 — FAG spindle bearing series on the ISO extra-light section. A 180 mm bore carries a 250 mm outside diameter in a 33 mm section.

36 — bore code. 36 × 5 = 180 mm.

E — 25° contact angle. The higher angle carries more axial load and raises axial stiffness.

T — laminated fabric cage, the phenolic execution FAG also writes as TPA.

P4S — FAG’s own super-precision tolerance class, which FAG states runs better than P4 to ISO 492:2023.

UL — single bearing ground for universal arrangement, set to the light preload step. Preload force 1,468 N, axial rigidity 402 N/µm.

What these specs mean in practice

Dynamic Load Rating: 162,000 N. Static Load Rating: 138,000 N. Fatigue Load Limit: 10,000 N. The fatigue limit is the load below which rolling-contact fatigue does not initiate, so it sets the threshold for effectively unlimited life.

Limiting Speed: 4,500 rpm grease; 7,000 rpm oil. Operating Temperature: −30 °C to 100 °C.

Contact Angle: 25°. Radial load is carried together with axial load acting in one direction, with the steeper load line favouring thrust capacity and axial stiffness over top speed.

Light preload is the softest of FAG’s three steps on this bearing. Medium raises the preload force to 4,890 N and rigidity to 630 N/µm; heavy takes it to 10,108 N and 845 N/µm, at the cost of running temperature.

Mounting data

Shaft shoulder diameter: 192 mm to h12. Outer ring shoulder diameter: 238 mm to H12. Maximum recess radius: 1 mm both sides. Minimum chamfer: 2 mm, and 1 mm on the opposite face. Distance between the apexes of the pressure cones: 66.6 mm. Lubricant injection pitch diameter: 201.6 mm to 209 mm. Bore Type: Straight. Harmonization Code: 8482.10.50.

Quantity and configuration

Unit Quantity: 1 Pc. A single bearing ground for universal arrangement, usable alone or set against others of the same designation.

Interchange guidance

Same envelope, same 25° angle, same super-precision tier: SKF 71936 ACDGA/P4A, Timken/Fafnir 3MM9336WICRSUL, NSK 7936A5TRSULP4, RHP 71936X3TRSULP4.

Load ratings differ between makers on this envelope and are not transferable. FAG rates this bearing 162,000 N dynamic against 138,000 N static; SKF’s 71936 ACDGA/P4A rates 159,000 N against 200,000 N.