FAGB7213C.TPA.P4.ULAngular Contact Spindle Bearing – 65 mm Bore, 120 mm OD, 23 mm Width, 15° Contact Angle, ABEC 7 / P4

Product Description

What this part is

FAG B7213C.TPA.P4.UL super-precision angular contact spindle bearing. Bore Diameter: 65 mm. Outside Diameter: 120 mm. Overall Width: 23 mm. Contact Angle: 15°. Dynamic Load Rating: 68,000 N. Static Load Rating: 38,500 N. Limiting Speed: 12,000 rpm grease; 19,000 rpm oil. Precision Class: ABEC 7 / P4. Cage Material: Phenolic. Cage Type: Machined. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Preload: Light. Lubricant: grease or oil. Item Weight: 0.99 kg (2.19 lb). Bearing Material: Chrome steel. Unit Quantity: 1 Pc.

Decoding the designation

B72 — FAG spindle bearing, heavy 02 dimension series. The thicker section carries more load than a B70 on the same bore.

13 — bore code. Bore Diameter: 65 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

Dynamic Load Rating: 68,000 N against a Static Load Rating of 38,500 N. Fatigue load limit: 4,050 N. The dynamic figure sits above the static figure throughout the FAG B7 spindle range, which is the normal pattern for this family.

Contact Angle: 15°. The shallow angle puts the load line near the radial plane, which favours speed and radial stiffness over thrust capacity. That is the angle chosen for machine-tool spindles.

Limiting Speed: 12,000 rpm grease; 19,000 rpm oil. Oil lubrication carries heat out of the contact, which is why the oil figure runs well above the grease figure.

Preload: Light. Preload force 386 N, axial rigidity 79 N/µm, lift-off force 1,198 N in the light class.

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

Mounting data

Shaft shoulder diameter da: 75.5 mm, tolerance h12. Outer ring shoulder diameter Da: 109.5 mm, tolerance H12. Maximum recess radius: 1.5 mm. Minimum chamfer dimension r: 1.5 mm. Distance between the apexes of the pressure cones a: 23.9 mm.

Quantity and configuration

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

Interchange guidance

Cross-Reference 1: FAG B7213-C-T-P4S-UL. Cross-Reference 2: SKF 7213 CD/P4A. Cross-Reference 3: NSK 7213CTYNSULP4, polyamide cage rather than phenolic. Cross-Reference 4: NTN 7213C/GNP4. Cross-Reference 5: Fafnir 2MM213WI. Cross-Reference 6: RHP 7213CTSUEP4. Cross-Reference 7: Koyo 7213C/P4. Cross-Reference 8: SNR 7213C/P4. Cross-Reference 9: MRC 7213, 29° contact angle rather than 15°.

The first eight share the 65 x 120 x 23 mm size, the 15° contact angle and the P4 class. The MRC 7213 has the same size but a 29° contact angle, so it carries more thrust at a lower speed.

Searchable forms of the designation: B7213C.TPA.P4.UL, B-7213C-TPA-P4-UL, B7213CTPAP4UL, B7213-C-TPA-P4-UL, 7213-TG.